Find resolution of an image in dpi value uploaded using paperclip

In our Rails Application, we are uploading images using Paperclip gem. I would like to know whether there is anyway to find DPI value of such an uploaded image?

date based condition check in ruby

I want to check a category based on the age of a member. My test are looking like this:

it "should return 'CATEGORY B' if member turn 15 on the 01-11-2015" do
  Timecop.freeze(Date.parse("01-11-2015"))
  @member.date_of_birth = "2000-11-01"
  expect(@member.category).to eq('CATEGORY B')
end

it "should return 'CATEGORY C' if member turn 15 on the 31-10-2015" do
  Timecop.freeze(Date.parse("01-11-2015"))
  @member.date_of_birth = "2000-10-31"
  expect(@member.category).to eq('CATEGORY C')
end

and my method in the model is looking like this:

def category
  local_age = age
  next_november = "01-11-#{Date.today.year}"
  last_day_in_oktober = "31-10-#{Date.today.year}"
  if local_age < 7 then
    'CATEGORY A'
  elsif local_age >= 7 && local_age < 15
    'CATEGORY B'
  elsif local_age > 15 && local_age < 40
    'CATEGORY C'
  elsif local_age >= 40
    'CATEGORY D'
  end
end

How can I implement the and freeze the time in the model in order pass the tests? Any idea

Check if local variable is defined given it's name as string in ruby

Can I check if a local variable is defined given it's name as string?

I know there is the function defined?, but you have to give the variable itself.

Example:

a = 'cat'
print defined?(a) # => "cat"
print defined?(b) # => nil

What I need is:

a = 'cat'
print string_defined?("a") # => "cat"
print string_defined?("b") # => nil

Or something like that. I can't find it in the docs...

I tried to use respond_to?, but doesn't seems to work...

Ruby Sinatra - How to capture post json data and save to file

How do I capture a Json data from POST route and save it to file? I have simple ruby sinatra code as below.

#!/usr/bin/env ruby
require 'rubygems'
require 'sinatra'
require 'json'

post '/' do
  values = JSON.parse(request.env["rack.input"].read)
# How do I save "values" of JSON to file..
end

How to add front end validation in bootstrap-wysihtml5-rails

I have integrated the bootstrap-wysihtml5 editor to description section in my rails application. Now I want to add the client side validation so that it would validate the presence of description field. I used bootstrap-wysihtml5-rails gem.

Thanks in advance.

How can I check whether new page is completed loaded or not using watir

Is there any way Can I check whether a particular page completely loaded or not using WATIR?

I tried with browser.status but it's not printing anything

Ruby ternary operator and method call

I am using ruby 2.1.5, facing some problem with ternary operator

Syntax error

request.xhr?  ? render :json => "success"  : redirect_to index_url

working

request.xhr?  ? render(:json => "success") : redirect_to(index_url)

Can some please explain How its works and why above one not working? Thanks in advance

Ruby on Rails: Categories not working or sorting

The posts and categories are not agreeing on something and I'm not sure what it is. What am I doing wrong?

As soon as I click a category nothing changes but the url to http://localhost:3000/posts?category=Physics

class Post < ActiveRecord::Base
  belongs_to :category
  # ...
end

class Category < ActiveRecord::Base
  belongs_to :posts
  # ...
end

Here is the Posts Controller:

class PostsController < ApplicationController     

    def index
        if 
            params[:category_id].blank?
            @posts = Post.all.order("created_at DESC")
        else
            @category_id = Category.find_by(name: params[:category]).id
            @posts = Post.where(category_id: @category_id).order("created_at DESC")
        end
    end

# ...
    def post_params
        params.require(:post).permit(:title, :link, :description, :category_id)
    end

Here is the index file:

<% Category.all.each do |category| %>
    <%= link_to category.name, posts_path(category: category.name) %>
    <% end %>


          <% @posts.each do |post| %>
              <%= link_to post.title, post  %>
            <%= link_to time_ago_in_words(post.created_at) + " ago", post %>  
          <% end %>

This is the migration for Posts:

  class CreatePosts < ActiveRecord::Migration
  def change
    create_table :posts do |t|
      t.string :title
      t.string :link
      t.text :description

      t.timestamps null: false
    end
  end
end

This is the migration for AddIdToPosts

class AddIdToPosts < ActiveRecord::Migration
  def change
      add_column :posts, :category_id, :integer
  end
end

This is what console told me about the last post:

irb(main):008:0> Category

=> Category(id: integer, name: string, created_at: datetime, updated_at: datetime)

irb(main):009:0> @post = Post.last

  Post Load (17.0ms)  SELECT  "posts".* FROM "posts"  ORDER BY "posts"."id" DESC LIMIT 1

=> #<Post id: 3, title: "Testing", link: "", 
       description: "testing", created_at: "2015-05-06 07:08:36", 
       updated_at: "2015-05-06 07:08:36", user_id: 1, category_id: 1>

Ruby on Rails uncaught throw :warden with Devise.

I have a very strange problem in my Ruby on Rails application. I have controller that looks like this:

class PersonReportsController < ApplicationController
  include ActionController::Live
  load_and_authorize_resource except: [:index]

  def index
    #some code
  end
end

and when I try to access it as an unlogged user application throws following error:

uncaught throw :warden

But when I delete from my controller:

include ActionController::Live

everything works fine... Any ideas how to solve this problem?

javascript code disappears on source window after refreshing page in rails 3 using jquery

Here is a unique problem I am not able to find solution to. I write a small black of code given as below.

$(document).ready(function () {
alert("Page loaded");
if (/iPhone|iPad|iPod/i.test(navigator.userAgent)) {
    $(document).on('visibilitychange', function () {
        if (document.hidden == false) {
            console.log("gotcha");
            location.reload();
        }
        console.log(document.hidden, document.visibilityState);
    });
}
});

I was working only for ipad(the bug was device specific) but now I face the issue that this code disappears after refreshing page a few times in all other machines also.

Solutions attempted till now:

1. I added this within the tag with and without specifying type="text/javascript" in the beginning of the page and in the end as well. Astonishingly this code disappears the same way and few other variables defined for javascript code within the tag remains same and visible.

2. I added a file separately with this block of code in it and included that file with <%= javascript_include_tag %> in two ways.

   2.1 Simply adding this tag in my separate view file.

   2.2 Adding it using "content_for" helper and thus calling it with yield and specified name in the application.html.erb file.

3.When I add this in my appliaction.js within assets folder it works but I need this specifically for a particular action else it will reduce my site's performance .

I do not understand whether the issue is with the code or what. I will be really thankful if someone provides a required solution to it.

I am using following things in it

ruby 1.9.3

rails 3.2.12

running server with foreman

memcache

Foreman conditional running processes

I have a foreman app with a Procfile like this

web: bundle exec rails s
custom_process: bundle exec rake custom:process
faking_custom_process: bundle exec rake custom:faking_process

And I want to run custom_process or faking custom_process depends on my needs:

foreman start # run web & custom_process
FAKING_PROCESS # run web & faking_custom_process

Yes, I know about ability of running like that foreman start -c faking_custom_process=0, but this is more difficult than I expect, right?

How can I connect Aweber to my Rails app using OAuth?

I'm trying to integrate my Rails app with Aweber via OAuth, using the official aweber gem.

If I follow their flow in the Rails console, I can get an access token, no problems:

oauth = AWeber::OAuth.new(ENV["AWEBER_CONSUMER_KEY"], ENV["AWEBER_CONSUMER_SECRET"])
puts oauth.request_token.authorize_url
# => http://ift.tt/1JpWwfi

Then I visit that URL, type in my credentials, get a verification code, and go back to the rails console:

oauth.authorize_with_verifier 'xxxxxx'
# => #<OAuth::AccessToken>

Success!

The problem is, I want to do this in the real world, not just at the console, which means my Ruby code needs to be broken up into two separate actions. First, there's the controller action which redirects to Aweber's Oauth page:

def aweber
  oauth = AWeber::OAuth.new(ENV["AWEBER_CONSUMER_KEY"], ENV["AWEBER_CONSUMER_SECRET"])
  redirect_to  oauth.request_token(oauth_callback: "http://ift.tt/1H0hUKK").authorize_url
end

Then there's the action which gets the access token after the user has input their credentials and been redirected:

def aweber_callback
  oauth = AWeber::OAuth.new(ENV["AWEBER_CONSUMER_KEY"], ENV["AWEBER_CONSUMER_SECRET"])
  oauth.authorize_with_verifier(params[:oauth_verifier]) 
end

When I do it this way, the final line (authorize_with_verifier) always raises #<OAuth::Unauthorized: 401 Unauthorized>.

Seems like the problem is that I'm initializing the oauth variable twice, meaning I have two unrelated instances of AWeber::Oauth ... and only the instance of AWeber::Oauth that generated the authorize_url can get the access token. But I can't get the *same* instance in bothaweber_callbackandaweber` because I'm dealing with two completely different threads and instances of the controller.

When I inspect oauth, I can see that the internal variables oauth.request_token.params["oauth_token"] and oauth.request_token.params["oauth_token_secret"] are different in each oauth, which I'm guessing is the cause of the problem. I can get the 'correct' oauth_token from the params (params[:oauth_token]), but I can't figure out how to get the correct oauth_token_secret (not to mention that manually setting instance variables like this feels very hacky and is probably not the best approach.)

How can I generate an access token?

Ruby on rails plugin

I´m new in Ruby on rails. I´m trying to write a plugin, place in in project menu, and insert some data per projects. but there is a problem in my plugin. I have written the plugin, and add a tab in project menu. the plugin show something, but now I wanna edit the data. in the page index.html.erb, show data. I have added a link to edit data. I add a page edit.html.erb. but when I click on the edit link, show that the page can not found. Can anyone help me_

Get sum of numbers within range (from 0 to user input)

This is the code i am using, its purpose is for the user to enter an integer, the program will then take the sum of all the numbers up to and including the one entered. There is probable an easier way to do this

 sum = 0
 puts "please enter a number"
 counter = gets.chomp.to_i
 begin
  sum += counter
  counter -= 1
 end while counter == 0

Ruby on Rails on Windows 'SQLite' installing error

I am facing this problem any one can help me. Ruby version 2.0.0 and rails version 4.2.1.

I have an array called p1 as below:

p1= [512, 2048]

I'm passing p1 to test method as below:

test(p1)

test method definition looks as below:

def test(value)
  if value.kind_of?(Array)
    value.each do |proto|
      puts"******#{proto}"
    end
  end
end

The above code execution is throwing the error:

#<NoMethodError: undefined methodto_i' for [512, 2048]:Array>

What could be the reason for it?

Get Postgres-activerecord setup to work both locally and in Heroku

I'm automating DB creation (with a Rakefile in a Sinatra App).

I would like to be able to run the rakefile from my Linux user "pete" (eg pete@pete_laptop: /path $ rake db:create) AND from Heroku.

It comes down to the settings in my config/database.rb:

ActiveRecord::Base.establish_connection(
  :adapter  => db.scheme == 'postgres' ? 'postgresql' : db.scheme,
  :host     => db.host,
  :port     => db.port,

  # pete@ubuntu_14.04_laptop--------
  # :username => 'pete',
  # :password => 'password',
  # OR
  # heroku -----------------
  # :username => db.user,
  # :password => db.password,

  :database => DB_NAME,
  :encoding => 'utf8'
)

If I use the pete@ubuntu_laptop settings, the database works in localhost but not in Heroku, If I use the heroku settings, the database works in localhost but not in Heroku.

How can I setup this file/my ubuntu laptop so that the app works both on localhost & in Heroku?

Cheers,

Pete

Scope on empty association

I'm trying to create a scope looking at empty association.

I've 4 classes : User, Idea Project and UserJoins.

More than one user can have the same idea or the same project.

I would like to create a scope to isolate users without ideas.

Idea.rb

has_many :user_joins
has_many :users, through: :user_joins

Project.rb

has_many :user_joins
has_many :users, through: :user_joins

User.rb

has_many :user_joins
has_many :ideas, through: user_joins, source: :imaginable, source_type: 'Idea'
has_many :projects, through: user_joins, source: :imaginable, source_type: 'Project'

scope :without_ideas, ->{
  # I'm stuck here.
}

UserJoin.rb

belongs_to :imaginable, polymorphic: true
belongs_to :user

I'm using Rails 3.2.17 and Ruby 2.0.0

Does anyone have an idea to solve this ?

Looking to Pinged a Series of Servers on a Subsecond Basis and Got a Response for Each

I'm trying to figure out the solution to what seems like a simple problem. I have a series of servers that I'd like to ping and get a response from which I will parse and present to the user. I've looked at a bunch of ruby frameworks and Gems, and none-seem like a perfect fit. Currently, I'm using:

• Sinatra
• Passenger
• Nginx
• Docker

The servers will likely be behind a firewall, and only visible to the node I'm running in the same group, so Javascript on the browser does not feel like a fit. Is there a known pattern for doing something like this?

How to use with_options for conditional validation

How can I use with_options for conditional validation ?

My code is

with_options if: (AppUser::User.creator=="is_admin") do |admin|
  admin.validates :first_name, :presence => true
  admin.validates :last_name, :presence => true
end

I have already set creator method in application controller.

before_action :set_global_user

def set_global_user
  if current_admin
    AppUser::User.creator= "is_admin"
  elsif current_user
    AppUser::User.creator= "is_user"
  else
    AppUser::User.creator=nil
  end
end

but I am getting

undefined method `validate' for false:FalseClass

what is wrong with this code.

Rails Undefined Method in an unknown way

I cloned a project that runs just fine. I did the bundle install, bundle update, db:create, db:migrate, and whatnot.

Now when I run http://localhost:3000/orders/new it returns a NoMethodError in Admin::Orders#new

I have this as part of my code under model/admin/area.rb

has_many :admin_accounts, :class_name => 'Admin::Account'

validates :name, :presence => true
validates :timezone, :presence => true
validates :time_offset, :presence => true
validates :shift_time1, :presence => true
validates :shift_time2, :presence => true
validates :unit_price_12, :presence => true
validates :unit_price_24, :presence => true

def next_shift_time_from_now
  current_time = Time.zone.now
  next_shift_time(current_time)
end

def next_shift_time(time)
  shift1 = time.change(hour: self[:shift_time1].hour)
  shift2 = time.change(hour: self[:shift_time2].hour)
  get_shift(time, shift1, shift2)
end

And this under my accounts.rb

require 'digest/md5'
before_save :encrypt_password
after_initialize :default_values

has_many :admin_orders, :class_name => 'Admin::Order'
belongs_to :admin_areas, :class_name => 'Admin::Area', :foreign_key => 'area_id'

under new.html

<div class="page-header clearfix">
  <div class="pull-right"><%= link_to 'Back', orders_path, class: "btn btn-primary btn-sm" %></div>
  <h3 class="pull-left">
    Creating New Order
  </h3>
</div>

<%= render 'form' %>

and this under _form.html.erb which has the error

    <div class="form-group field-bottom-container">
      <label id="nextShiftTime">Next Shift Time</label>

      <div>
        <% @user = Admin::Account.find($user_id) %>
        <%= @nextShiftTime=format_datetime(@user.admin_areas.next_shift_time_from_now) %>
      </div>
    </div>

The error is this line: <%= @nextShiftTime=format_datetime(@user.admin_areas.next_shift_time_from_now) %>

which returns... undefined method `next_shift_time_from_now' for nil:NilClass

Is there anything I must configure to fix this? I think there's nothing wrong with the code since it worked well previously and upon recent clone, with no changes with the codes i might add, the program is causing this error.

How to install ruby on rail application as a plugin in my application?

I am already using open source RoR application. Now I have to create plugin. In that plugin the features I want to use are available in other application. So i want to use that. How can it be done ?

What should be stored in DB when converting site into rails [on hold]

I believe this is more of a subjective question than not, that being said, I am much newer to rails than a lot of you, so I trust your opinion more than my own. Basically I've been talking to someone I know about redoing there website into a rails app, but I am not sure how the best way to go about setting up the database would be. Here is a link to the site I will be remaking http://ift.tt/1OY6mvK.

My question to you is, what all belongs in a database? My first thought is to create two main tables in the db, sections and articles, and have each article belong to a section. I will store all of the html for the content of each separate pages in the db under a certain section (for instance the "welcome", "FAQs", "Contact Information", and all other links under the about dropdown menu will be separate articles stored in the db which belong to the "About" section.)

**Update 5/05/2015 2:37 PM CDT I should clarify that when I say I will post the html for each of those pages in the database, I do not mean ALL of the html on that given page, just the content on those pages that is unique to that page (so headers, menu bars, etc. will not be stored in the database)

However, I'm beginning to wonder if storing all that html and text in a database would be too much, or would be bad practice, and if it is better to just create separate html files for each page, too make it easier to style text and create tables within text and stuff like that. I see pros and cons to both sides, a huge pro, for example, is the fact that if I did store it in the database I would not need to create 30+ HTML files, and could just pass in different Articles from the database into a preformatted page.

So I'm just looking for some advice on what you guys think is the best way to go about this project!

Remove array elements that are present in another array

There is a list of words and list of banned words. I want to go through the word list and redact all the banned words. This is what I ended up doing (notice the catched boolean):

puts "Give input text:"
text = gets.chomp
puts "Give redacted word:"
redacted = gets.chomp

words = text.split(" ")
redacted = redacted.split(" ")
catched = false

words.each do |word|
  redacted.each do |redacted_word|
    if word == redacted_word
        catched = true
        print "REDACTED "
        break
    end
  end
    if catched == true
        catched = false
    else
        print word + " "
    end
end

Is there any proper/efficient way?

Getting error while executing and calabash program

Hi I am getting the below error

D:>calabash-android run d:\Android\Apk_Files\EriBank.apk C:/Ruby21/lib/ruby/2.1.0/rubygems/dependency.rb:298:in to_specs': Could not fi d 'cucumber' (~> 1.3.17) - did find: [cucumber-2.0.0] (Gem::LoadError) from C:/Ruby21/lib/ruby/2.1.0/rubygems/specification.rb:1295:inblock n activate_dependencies' from C:/Ruby21/lib/ruby/2.1.0/rubygems/specification.rb:1284:in each' from C:/Ruby21/lib/ruby/2.1.0/rubygems/specification.rb:1284:inactiva e_dependencies' from C:/Ruby21/lib/ruby/2.1.0/rubygems/specification.rb:1266:in activa e' from C:/Ruby21/lib/ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:54:inge ' from C:/Ruby21/bin/calabash-android:22:in `'

Please help me out if anyone knows any solutions for this.

In ruby console, how to update instance variable?

I have a model named "Person". In ruby console, I first declare an instance of Person, then I update the attributes, then save.

person = Person.last
person.name = "jeff"
person.save

After doing these, I got message like this:

   (9.9ms)  BEGIN
   (7.5ms)  ROLLBACK
=> false

What are "BEGIN", "ROLLBACK", "false" refers to separately? I googled, but nothing came out.

Push value to model when created - Rails

I am trying to set the inputter_id value automatically to the id for for the inputter_type corresponding to "Medical team" in a form if the user is a current_clinician:

  def create
    esas_assessment_params = params.require(:esas_assessment).permit(:patient_id, :clinician_id, :time, :year, :month, :day, :inputter_name, :inputter_id, :pain, :pain_comment, :tiredness, :tiredness_comment, :drowsiness, :drowsiness_comment, :nausea, :nausea_comment, :lack_of_appetite, :lack_of_appetite_comment, :shortness_of_breath, :shortness_of_breath_comment, :depression, :depression_comment, :wellbeing, :wellbeing_comment, :other_symptom_id, :other_symptom_score, :other_symptom_comment, :esas_comment)
    @esas_assessment = EsasAssessment.new(esas_assessment_params)
    if current_clinician
      @esas_assessment.clinician = current_user.clinician
      @esas_assessment.inputter_name = current_user.clinician.full_name
      @esas_assessment.inputter_id = Inputter.find_by(inputter_type: 'Medical team')
    else
      @esas_assessment.patient = current_user.patient
      @esas_assessment.clinician = current_user.patient.clinician
    end
    if @esas_assessment.save
      redirect_to esas_assessments_path, notice: "ESAS assessment submitted!"
    else
      render "new", alert: "ESAS assessment not submitted!"
    end
  end

or more simply:

  def create
    esas_assessment_params = params.require(:esas_assessment).permit!
    @esas_assessment = EsasAssessment.new(esas_assessment_params)

     @esas_assessment.inputter_id = Inputter.find_by(inputter_type: 'Medical team')

    if @esas_assessment.save
      redirect_to esas_assessments_path, notice: "ESAS assessment submitted!"
    else
      render "new", alert: "ESAS assessment not submitted!"
    end
  end

in the first example the lines to set the @esas_assessment.clinician value automatically to the current_user.clinician and setting the inputter_name both work but the inputter_id doesn't.

My EsasAssessment model is:

EsasAssessment:
  patient_id: integer
  clinician_id: integer
  created_at: datetime
  updated_at: datetime
  inputter_name: string
  inputter_id: integer

class EsasAssessment < ActiveRecord::Base
    belongs_to :other_symptom
    belongs_to :clinician
    belongs_to :patient
    belongs_to :inputter
end

Inputter is:

Inputter:
  inputter_type: string

class Inputter < ActiveRecord::Base
    has_many :esas_assessments
end

When I submit my form I don't get any errors or warning, inputter_id is just nil

if I enter

Inputter.find_by(inputter_type: 'Medical team')

in Console it returns

#<Inputter {"id"=>309, "inputter_type"=>"Medical team"}>

Any advice on how to get the value to stick to the new EsasAssessment would be great

Ruby rails can't add user entry

Everything seems to go fine and there's no error message when executing user.save, but it doesn't show up when indexing.

I ran the migration:

class AddEmailToUsers < ActiveRecord::Migration
  def change
    add_column :email, :name, :password, :password_confirmation, :string
  end
end

models/user.rb

class User < ActiveRecord::Base
  #attr_accessor :remember_token
  attr_accessor :email
  attr_accessor :name
  attr_accessor :password_digest
  attr_accessor :password, :password_confirmation
  before_save { self.email = email.downcase }
  validates :name,  presence: true, length: { maximum: 50 }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  validates :email, presence: true, length: { maximum: 255 },
                    format: { with: VALID_EMAIL_REGEX },
                    uniqueness: { case_sensitive: false }
 # has_secure_password
  validates :password, length: { minimum: 6 }

  # functions...
end

Here on create I fill in some sample values to test it, and it submits to views/users/create.html.erb without anything displaying in "Error: []" and the correct data shown for the fields of @user.

controllers/user_controller.rb

class UsersController < ApplicationController
  def new
    #require 'bcrypt'
    @user = User.new
  end

  def index
    @users = User.all
  end

  def show
    @user = User.find(params[:id])
  end

 def create
    #@user = User.new(user_params)
    @user = User.new(name: "di3", email:"di3@di3.com", password: "di3", password_confirmation: "di3")
    #@user = User.new(params[:user])
    if @user.save!
      log_in @user
      flash[:success] = "Welcome to the forum!"
      #redirect_to @user
      #redirect_to users_path
    else
      #render 'new'
      render @user.error_messages.full
    end
  end

  private

  def user_params
      params.require(:user).permit(:name, :email, :password, :password_confirmation)
    end
end

views/users/create.html.erb

<h1>Create user params</h1>

<%= render partial: 'layouts/header' %>

<table>
  <tr>
    <th>Email</th>
    <th>Name</th>
    <th>Password</th>
  </tr>

      <tr>
        <td><%= @user.email %></td>
        <td><%= @user.name %></td>
        <td><%= @user.password %></td>
        <td><%= @user.password_confirmation %></td>
      </tr>
</table>

<br/>

Error:

<%= @user.errors.full_messages %>

But this user index doesn't show any users at all:

views/users/index.html.erb

<h1>Listing forums</h1>

<%= render partial: 'layouts/header' %>

<table>
  <tr>
    <th>Email</th>
    <th>Name</th>
    <th>Password</th>
    <th>Password</th>
    <th>Password</th>
  </tr>

  <% if(@users)
    @users.each do |user| %>
      <tr>
        <td><%= user.email %></td>
        <td><%= user.name %></td>
        <td><%= user.password_digest %></td>
        <td><%= user.password %></td>
        <td><%= user.password_confirmation %></td>
      </tr>
    <% end %>
  <% end %>
</table>

Rails: Tips for parsing JSON [on hold]

I'm relatively new to rails. Was curious if I'm parsing JSON the 'right/best' way. So I'm trying to get a list of subreddits from Reddit so I used the subreddits JSON from Reddit.

Here is what I first did to convert the JSON to hash -

require 'open-uri'

hash = JSON.load(open('http://ift.tt/1k5Yusm'));

I then, got the list display_name (subreddit names) from my hash the following way -

subreddit_arr = hash["data"]["children"].map { |c| c["data"]["display_name"]}

which gave me -

["funny", "pics", "AdviceAnimals", "aww", "todayilearned", "videos", "gaming", "gifs", "BlackPeopleTwitter", "WTF", "fatpeoplehate", "leagueoflegends", "AskReddit", "pcmasterrace", "me_irl", "worldnews", "news", "Showerthoughts", "DotA2", "4chan", "mildlyinteresting", "TrollXChromosomes", "nba", "politics", "trees"]

How can I get a list of all subreddits (not just 25) in the most efficient manner?

Ruby / Brew Stopped Working Yosemite

I'm fairly new to this so hang with me..

I have been searching for a solution to this problem for a week now.

Ruby does not seem to be working

ruby
-bash: ruby: command not found

or

ruby -v
-bash: ruby: command not found

and whenever I try homebrew this is what comes back

/usr/local/bin/brew: /usr/local/Library/brew.rb:     /System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/ruby: bad     interpreter: No such file or directory
/usr/local/bin/brew: line 21: /usr/local/Library/brew.rb: Undefined error: 0

as you can see above I had changed the ruby framework to read from 1.8 to Current as others had suggested, however this did not solve the problem as it did for users who had encountered the same issue.

So the search continues on...

My usr/local/bin/brew script looks like this -

#!/System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/ruby -W0
# encoding: UTF-8

std_trap = trap("INT") { exit! 130 } # no backtrace thanks

HOMEBREW_BREW_FILE = ENV['HOMEBREW_BREW_FILE']

if ARGV == %w{--prefix}
  puts File.dirname(File.dirname(HOMEBREW_BREW_FILE))
  exit 0
end

require 'pathname'
HOMEBREW_LIBRARY_PATH =     Pathname.new(__FILE__).realpath.dirname.parent.join("Library/Homebrew").to_s
$:.unshift(HOMEBREW_LIBRARY_PATH + '/vendor')
$:.unshift(HOMEBREW_LIBRARY_PATH)
require 'global'

case ARGV.first when '-h', '--help', '--usage', '-?', 'help', nil
  require 'cmd/help'
  puts Homebrew.help_s
  exit ARGV.first ? 0 : 1
when '--version'
  puts HOMEBREW_VERSION
  exit 0
when '-v'
  puts "Homebrew #{HOMEBREW_VERSION}"
  # Shift the -v to the end of the parameter list
  ARGV << ARGV.shift
  # If no other arguments, just quit here.
  exit 0 if ARGV.length == 1
end

   # Check for bad xcode-select before anything else, because `doctor` and
# many other things will hang
# Note that this bug was fixed in 10.9
if OS.mac? && `xcode-select -print-path 2>/dev/null`.chomp == '/' &&     MacOS.version < :mavericks
  ofail <<-EOS.undent
  Your xcode-select path is currently set to '/'.
  This causes the `xcrun` tool to hang, and can render Homebrew unusable.
  If you are using Xcode, you should:
    sudo xcode-select -switch /Applications/Xcode.app
  Otherwise, you should:
    sudo rm -rf /usr/share/xcode-select
 EOS

  exit 1
end

case HOMEBREW_PREFIX.to_s when '/', '/usr'
  # it may work, but I only see pain this route and don't want to support it
  abort "Cowardly refusing to continue at this prefix: #{HOMEBREW_PREFIX}"
end
if OS.mac? and MacOS.version < "10.5"
  abort <<-EOABORT.undent
    Homebrew requires Leopard or higher. For Tiger support, see:
    http://ift.tt/17h053J
  EOABORT
end

# Many Pathname operations use getwd when they shouldn't, and then throw
# odd exceptions. Reduce our support burden by showing a user-friendly error.
Dir.getwd rescue abort "The current working directory doesn't exist, cannot proceed."


def require? path
  require path.to_s.chomp
rescue LoadError => e
  # HACK :( because we should raise on syntax errors but
  # not if the file doesn't exist. TODO make robust!
  raise unless e.to_s.include? path
end

begin
  trap("INT", std_trap) # restore default CTRL-C handler

  aliases = {'ls' => 'list',
             'homepage' => 'home',
             '-S' => 'search',
             'up' => 'update',
             'ln' => 'link',
             'instal' => 'install', # gem does the same
             'rm' => 'uninstall',
             'remove' => 'uninstall',
             'configure' => 'diy',
             'abv' => 'info',
             'dr' => 'doctor',
             '--repo' => '--repository',
             'environment' => '--env',
             '-c1' => '--config',
             }

  cmd = ARGV.shift
  cmd = aliases[cmd] if aliases[cmd]

  sudo_check = Set.new %w[ install link pin unpin upgrade ]

  if sudo_check.include? cmd
    if Process.uid.zero? and not File.stat(HOMEBREW_BREW_FILE).uid.zero?
      raise "Cowardly refusing to `sudo brew #{cmd}`\n#{SUDO_BAD_ERRMSG}"
    end
  end

  # Add contributed commands to PATH before checking.
  ENV['PATH'] += ":#{HOMEBREW_CONTRIB}/cmd"
  if require? HOMEBREW_REPOSITORY/"Library/Homebrew/cmd"/cmd
    Homebrew.send cmd.to_s.gsub('-', '_').downcase
  elsif which "brew-#{cmd}"
    %w[CACHE CELLAR LIBRARY_PATH PREFIX REPOSITORY].each do |e|
      ENV["HOMEBREW_#{e}"] = Object.const_get "HOMEBREW_#{e}"
    end
    exec "brew-#{cmd}", *ARGV
  elsif require? which("brew-#{cmd}.rb").to_s
    exit 0
  else
    onoe "Unknown command: #{cmd}"
    exit 1
  end

rescue FormulaUnspecifiedError
  abort "This command requires a formula argument"
rescue KegUnspecifiedError
  abort "This command requires a keg argument"
rescue UsageError
  onoe "Invalid usage"
  abort ARGV.usage
rescue SystemExit
  puts "Kernel.exit" if ARGV.verbose?
  raise
rescue Interrupt => e
  puts # seemingly a newline is typical
  exit 130
rescue BuildError => e
  e.dump
  exit 1
rescue RuntimeError, SystemCallError => e
  raise if e.message.empty?
  onoe e
  puts e.backtrace if ARGV.debug?
  exit 1
rescue Exception => e
  onoe e
  puts "#{Tty.white}Please report this bug:"
  puts "    #{Tty.em}#{ISSUES_URL}#{Tty.reset}"
  puts e.backtrace
  exit 1
else
  exit 1 if Homebrew.failed?
end

    enter code here

Does any of this make sense or ring any bells? Could it have anything to do with why I'm getting the Homebrew or Ruby error?

Any help would be greatly appreciated.

I'd be happy to provide as much information as possible for us to solve this problem! :)

ruby idiom for update or insert a hashmap

Is there a common ruby idiom for this code:

if hashmap.has_key?(key)
    hashmap[key] += 1
else
    hashmap[key] = 1
end

It feels like there might be a high order function that helps here. I'm hoping for something like

hashmap[key].insertOrUpdate { 1 }, {|value| value += 1}

How to combine two same blocks into a single one?

How can I use a single block in this:

devise_parameter_sanitizer.for(:sign_up) do |u|
  u.permit(:full_name, :email, :password, :password_confirmation)
end
devise_parameter_sanitizer.for(:account_update) do |u|
  u.permit(:full_name, :email, :password, :password_confirmation)
end

Counting the Days from the current_level?

There are 5 levels.

Each level has a certain amount of days in it that must pass before the habit can move up to the next level (as broken down by n_days):

      case n_days     
          when 0..9
            1
          when 10..24
            2
          when 25..44
            3  #Level 3
          when 45..69
            4
          when 70..99
            5
          else
            "Mastery"
         end
      end

How can we call the n_days from the present level in the habits index with something like <%= habit.current_level.n_days.count_off_from_zero_to_show %>?

For example, if we are specifically at 50 on level 3 it would show Day 5 in the habits index.

habit.rb

class Habit < ActiveRecord::Base
    belongs_to :user
    has_many :comments, as: :commentable
    has_many :levels
    serialize :committed, Array
    validates :date_started, presence: true
    before_save :current_level
    acts_as_taggable
    scope :private_submit, -> { where(private_submit: true) }
    scope :public_submit, -> { where(private_submit: false) }

attr_accessor :missed_one, :missed_two, :missed_three

    def save_with_current_level
        self.levels.build
        self.levels.build
        self.levels.build
        self.levels.build
        self.levels.build
        self.save
    end

    def self.committed_for_today
    today_name = Date::DAYNAMES[Date.today.wday].downcase
    ids = all.select { |h| h.committed.include? today_name }.map(&:id)
    where(id: ids)
  end 

    def current_level_strike
      levels[current_level - 1] # remember arrays indexes start at 0
    end

    def current_level
            return 0 unless date_started
            committed_wdays = committed.map { |day| Date::DAYNAMES.index(day.titleize) }
            n_days = ((date_started.to_date)..Date.today).count { |date| committed_wdays.include? date.wday } - self.missed_days

      case n_days     
          when 0..9
            1
          when 10..24
            2
          when 25..44
            3
          when 45..69
            4
          when 70..99
            5
          else
            "Mastery"
        end
    end
end

level.rb

class Level < ActiveRecord::Base
  belongs_to :habit
end

schema

create_table "habits", force: true do |t|
  t.integer  "missed_days",    default: 0
  t.text     "committed"
  t.integer  "days_lost",   default: 0
  t.datetime "date_started"
  t.string   "trigger"
  t.string   "target"
  t.string   "reward"
  t.boolean  "private_submit"
  t.integer  "user_id"
  t.datetime "created_at",                 null: false
  t.datetime "updated_at",                 null: false
  t.integer  "order"
end

add_index "habits", ["user_id", "created_at"], name: "index_habits_on_user_id_and_created_at"
add_index "habits", ["user_id"], name: "index_habits_on_user_id"

create_table "levels", force: true do |t|
  t.integer  "habit_id"
  t.integer  "days_lost",   default: 0
  t.integer  "missed_days",   default: 0
  t.integer  "current_level"
  t.datetime "created_at",                null: false
  t.datetime "updated_at",                null: false
end

add_index "levels", ["habit_id"], name: "index_levels_on_habit_id"

The Gist of it: http://ift.tt/1PISTF0

NoMethodError in Blog::PostsController#create

Note: Rails newb here.

So, I recently created a Rails app with mongoid gem for use of MongoDB. I have a namespace route of :blog with a nest of resource of posts

Routes.rb:

Rails.application.routes.draw do
  namespace :blog do
    resources :posts
  end
end

The error comes from app/controllers/blog/post_controller.rb:

Class Blog::PostController < ApplicationController
  def create
   @post = Post.new(post_params)

  if @post.save
    redirect_to @post
  else
    render 'new'
  end
 end
end

I also have a 'post' model that comes with a title and body:

Class Post
 include Mongoid::Document
 field :title, type: String
 field :body, type: String
end

In new.html.erb:

<h1>Rails Sample Blog</h1>

<%= form_for :post, url: blog_post_path do |f| %>
  <div><%= f.label :title %><%= f.text_field :title %></div>
  <div><%= f.label :body %><%= f.text_area :body %></div>
<% end %>

Is there something I left out that I didn't catch? It's slowly haunting me.

Multidimensional Arrays in Ruby like C++

I had previously created a struct and an array of the same in C++ , now i want to implement the same in Ruby.

/ Number of Elements (Which can be increased) :D
#define ELM_NO 110

struct elem
{
  char name[18];
  char elm_symbol[5];

  double atm_weight;

  int elm_melting;
  int elm_boiling;
  int elm_yearofdis;
  int elm_group;

  double elm_ionis_e;
};

elem element[ELM_NO] = { {" Hydrogen"  ,"H"  ,1.0079 ,-259 ,-253 ,1776 ,1  ,13.5984 },
                      {" Hydrogen"  ,"H"  ,1.0079 ,-259 ,-253 ,1776 ,1  ,13.5984  } ,
                      {" Helium"  ,"He" ,4.0026 ,-272 ,-269 ,1895 ,18 ,24.5874  } ,
                      {" Lithium" ,"Li" ,6.941  ,180  ,1347 ,1817 ,1  ,5.3917 } ,
                      {" Beryllium" ,"Be" ,9.0122 ,1278 ,2970 ,1797 ,2  ,9.3227 } ,
                      {" Boron" ,"B"  ,10.811 ,2300 ,2550 ,1808 ,13 ,8.298  } ,
                      {" Carbon"  ,"C"  ,12.0107  ,3500 ,4827 ,0  ,14 ,11.2603  } ,
                      {" Nitrogen" ,"N"  ,14.0067  ,-210 ,-196 ,1772 ,15 ,14.5341  } ,
                      {" Oxygen" ,"O"  ,15.9994  ,-218 ,-183 ,1774 ,16 ,13.6181  } ,
                      {" Fluorine" ,"F"  ,18.9984  ,-220 ,188  ,1886 ,17 ,17.4228  } ,
                      {" Neon" ,"Ne" ,20.1797  ,-249 ,-246 ,1898 ,18 ,21.5645  } ,
                      {" Sodium" ,"Na" ,22.9897  ,98 ,883  ,1807 ,1  ,5.1391 } ,
                      {" Magnesium"  ,"Mg" ,24.305 ,639  ,1090 ,1755 ,2  ,7.6462 } ,
                      {" Aluminum" ,"Al" ,26.9815  ,660  ,2467 ,1825 ,13 ,5.9858 } };

Omitted some parts.

Now , I want to implement in Ruby . The problem is I don't know how to implement 2D arrays from which we can access an Individual Element from the Inner Array.

Can anybody show me how it's done ?

Convert sample java code to ruby to understand static variales in ruby

can anybody help me to convert this simple java code to ruby.

class A {
 private static String[] chachedNames;

 public static String[] getNames(){
  if(chachedNames == null)
   chachedNames = prepareNames(); //This process will take 20sec to complete
  return chachedNames;
 }
}

I'm trying to understand basic memory caching on static method. How do implement same on Ruby.

Getting date parts from a simple treetop parser: wrong argument type Class (expected Module)

For the following treetop grammer, when parsing '3/14/01' (via t = Parser.parse('3/14/01') in irb), I get a "TypeError: wrong argument type Class (expected Module)".

grammar SimpleDate

  rule dateMDY
      whitespace? month_part ( '/' / '-') day_part ( ('/' / '-') year_part)? whitespace?  <DateMDY>
  end

  rule month_part
    ( ( '1' [0-2] ) / ( '0'? [1-9] ) )  <MonthLiteral>
  end

  rule day_part
    ( ( [12] [0-9] ) / ( '3' [0-1] ) / ( '0'? [1-9] ) ) <DayLiteral>
  end

  rule year_part
    ( ( '1' '9' ) / ( '2' [01] ) )? [0-9] [0-9]   <YearLiteral>   # 1900 through 2199 (4 digit)
  end

  rule whitespace
    [\s]+
  end

end

First, if I comment out the <MonthLiteral> and the <DayLiteral> class references, all is well. Commenting out <DateMDY>, but leaving those Literal objects in, will also issue the error. Commenting out <YearLiteral> does not seem to matter (it'll work or not work regardless) -- that seems to indicate that because the first two are non-terminal, I can't produce elements for them.

There is clearly something I'm not appreciating about how Ruby (or treetop) is instantiating these classes or about AST generation that would explain what happens. Can you explain or point me to something that can help me understand why <MonthLiteral> or <DayLiteral> can't have objects generated?

Second, this may be a bridge too far, but what I'd really prefer would be to get a DateMDY object with three attributes -- month, day, and year -- so I can readily produce a Ruby Time object from a method to_time in DateMDY, but right now I'd settle for just producing the constituent pieces as objects.

So I tried leaving <DateMDY> as the object and commented out the references to <MonthLiteral>, <DayLiteral>, and <YearLiteral>. I saw that the resulting AST object returned from .parse (t in my original example) has two public methods -- :day_part and :month_part but those seem to be nil when I invoke those (say, puts t.day_part) and there is no :year_part method, so that didn't seem to help me out.

Is it possible to do somehow have DateMDY end up accessing its constituent parts?

FYI, the Parser code itself I'm using is pretty standard stuff from the treetop tutorials and the node_extensions.rb that defines the object classes is also trivial, but I can post those too if you need to see those.

Thanks! Richard

Rename everything to match new inflection after running a generator

I have a model in my rails app that has an irregular pluralisation. I know that I can fix this by adding the appropriate code to config/initializers/inflections.rb.

The problem is I didn't realise it was incorrect until after I ran a bunch of other generators and wrote a lot of code.

Is there any easy way (perhaps a gem?) to batch rename all my files, models, controllers, schema (via a migration I guess), etc to use the correct inflection?

How to reimplement the map method in ruby using recursion?

I'm a ruby newbie, learning to code. I wanted to understand how some of the methods available from the Enumerable module work. So I'm reimplementing them. One challenge was to implement them using recursion. However, I'm running into a problem when trying to implement the Enumerable#Map method using recursion.

This is my code:

class Array
  def mymap_recursive(&block)
    copy_of_array = dup
    new_array = []
    return new_array if copy_of_array.empty?
    value = copy_of_array.shift
    new_array << yield(value)
    copy_of_array.mymap_recursive(&block)
  end
end

I tried to figure out why it wasn't working so I put

puts "#{new_array}"

at the end of the method. Then in Sublime Text, I did

arr = [2,2,5,5,10]
arr.mymap_recursive {|n| n * n}

After pressing cmd+b, the output I got was:

[100]
[25]
[25]
[4]
[4]

I cannot figure out why its not returning one array with all the values.

Thanks for your help!

What's the best way search a Ruby Hash for key-value pairs matching a value and then changing that value?

I'm building a Blackjack game to better understand Ruby, and am trying to have users able to switch out values from a "hand." I store the deck as a Hash containing the deck and then scoring value like this :D8 => 8 where it's an eight of Diamonds worth eight points. Aces, because they can be either 1 or 11 get stored like this: :SA => "option."

I would like to be able to prompt the user to for a value or This is currently part of the code:

def checkAce
    if @player_hand.has_value?("option")

        puts "What do you want your aces to be worth? 11 or 1"

        ace_value = gets.chomp
        aces = @player_hand.find {|k, v| @player_hand[k] == "option"}

        if ace_value == "1" || ace_value == "11"
            aces.each { |k, v| aces[k] = ace_value }
        else 
            checkAce
        end 

        # merge back into hand 
        @player_hand.merge!(aces)

    else
        puts "No aces, so on to the main event." 
    end 
end

But this code doesn't work: first, the ace_value gives me a typeerror saying that symbol cannot be coerced into integer. And second, the @player_hand.merge!(aces) doesn't find a method. Any advice?

Testing infinite loop with MiniTest and using mocking

I have a section in my code which polls a queue for a message and then acts on it depending on the message type:

@queue = Foo::Queue.new
loop do
  @queue.poll do |message|                                                                                                                              
    if message[:task] == TAKEACTION
      result = takeaction(message)
      @queue.send_result(result, message)
    end
    @queue.pong(message) if message[:task] == PING
  end
end

How do I set up a test to supply a single message and verify that the @queue acts on it as I expect?

I have seen very little about testing blocks in minitest, and haven't found anything in ruby regarding breaking out of infinite loops, though I found one idea in python where you set up the second run to throw an exception.

Can any ruby / minitest gurus help?

Error when ruby install on windows xp sp3 32 bit

I am trying to install and run Ruby on Windows XP sp3 32bit, and running into issues.

• I downloaded the file ruby2.2.2.exe from the ruby installer website and installed it.

• When I tried to execute Ruby through the command prompt cmd, I got the following error:

  The procedure entry point_gmtime64_s could not be located in the dynamic link >library msvcrt.dll.

  

Please help me resolve it! :)

Ruby method using class and instances

I'm just starting out with Ruby and trying to write a method that returns "Title was written by author", where title and author are variables. I think I'm close, but I'm not sure what to add at this point.

class Book
  def set_title_and_author=(title, author)
    @title = title
    @author = author
  end
  def set_title_and_author
  "#{@title} was written by #{@author}"
  end
end

Creating user from rails console command?

I am newbie in Ruby, I am trying to install one app that says:

lobsters$ rails console
Loading development environment (Rails 4.1.8)

irb(main):001:0> User.create(:username => "test", :email => "test@example.com", :password => "test", :password_confirmation => "test", :is_admin => true, :is_moderator => true
irb(main):002:0> Tag.create(:tag => "test")

When I run rails console, it outputs "create some file" So how do I create user?

Group by date and reduce an array to create a new one

I have this array:

> source

# =>
[[Fri, 13 Mar 2015, [24.2]],
 [Tue, 17 Mar 2015, [0.01, 8.26]],
 [Mon, 16 Mar 2015, [0.01, 0.01, 0.01, 0.01]],
 [Mon, 16 Mar 2015, [0.01, 0.01]],
 [Fri, 13 Mar 2015, [24.2, 24.2, 24.2, 24.2, 24.2, 24.2, 24.2]],
 [Fri, 13 Mar 2015, [24.2, 24.2, 24.2, 24.2, 24.2, 24.2, 24.2, 24.2, 24.2, 24.2]],
 [Mon, 16 Mar 2015, [15.95]],
 [Thu, 12 Mar 2015, [352429.0, 35242900.0, 3.0]]
]

How can I create this one out of it:

[
  [Thu, 12 Mar 2015, aaa]
  [Fri, 13 Mar 2015, bbb],
  [Mon, 16 Mar 2015, ccc],
  [Tue, 17 Mar 2015, ddd]
]

Where aaa, bbb ... are the sums of the elements with the same date. Note that [Thu, 12 Mar 2015, aaa]

are 2 elements, not 3: 12 Mar 2015 and aaa

What I tried:

source.group_by { |x| x[0] }.reduce(0) # sum up all the element except the 1st one which is a date - how?

What's happens in Ruby and Python? Why the variable wil be nil in if block in ruby ,but undefined in python?

This question already has an answer Confusion with the assignment operation inside a falsy `if` block

  if false
      y = 'hi'
   end

  puts y

In ruby y has been "defined" in the if block,it will be nil(why?). Remove that block and this gives an error.

But, in python

 if False:
   y = 'hi'

 print y

It will gives an error.

What's happens in Ruby and Python?

Getting user ID when calling an action

I have a table for doing CRUD operations on books, and also users can check in books (the checking out is done my a different controller)

At the moment the check in works for the book table, but I can't update user data - the integer of how many books they have loaned out

Here is part of my table:

    <tr><% @books.each do |book| %>

        <td><%= book.title %></td>
        <td><%= book.author %></td>
        <td class ="onloan"><%= book.onloan %></td>
        <td><%= link_to 'show', book %> </td>
        <td><%= link_to 'edit', edit_book_path(book) %></td>
        <td><%= link_to 'Destroy', book, method: :delete, data: { confirm: 'Are you sure?' } %></td>
        <td><%=  link_to 'Check in', check_in_path(book)%></td>

    </tr>

    <% end %>

What I want to add is something like

@user = User.find(params[:id])
@user.books_on_loan - 1

Here is the check in def of my controller:

def check_in


 Book.find(params[:id]).update_attribute(:onloan, 0)

 redirect_to root_path


end

extract info out of XML tag - RUBY

I have an xml tag like this

    <cvParam cvRef="MS" accession="MS:1000511" name="ms level" value="1"/>

How can i get the value of ms level (1)? Please, don't suggest nokogiri or rexml. I want to learn how I can parse info out while I read the file, line by line. Thank you.

Avoiding eval when building radio buttons in rails

Here, I am building database driven radio buttons. I wanted to know if there is a way I can avoid eval and see checked is true or not !Thanks,

Index Controller

 columns = Model.column_names  

View in haml

- columns.each do |cols|
      - check = "c[0].#{cols}==1? true : false" // checking value here
      - negcheck = "c[0].#{cols}==0? true : false"// checking value here    
      - pluckid = "c[0].id"
      - id = eval(pluckid)
      %tbody
         %td #{cols}
         %td
          = label_tag 'On'
          = radio_button_tag("ABC",1,checked = eval(check), options = {})
          = label_tag 'Off'
          = radio_button_tag("xyz",0,checked = eval(negcheck), options = {})

Return from multiple ruby forks

I have the following code

read, write = IO.pipe
count = {}
ARGV.each do |filename|
    fork do
        read.close
        write.write Marshal.dump(do_stuff(filename))
        write.close
    end
end
write.close
count = Marshal.load(read.read)
read.close
Process.waitall

printf(count)

which works for one fork but I obviously want to achieve concurrency so I'd need to get the count hash from all the forks. However I've so far only been able to retrieve one hash from either of the forks. How can I return all of them?