Question

I’ll use StackOverflow as my example. Let’s say I have a Question model. A logged in user can “star” a Question to mark is as one of their favorites. In the database, this sort of thing would probably be stored in a UserQuestions table with a user_id field and a question_id field. This sort of feature is not typical CRUD since there is really only “list”, “add”, and “delete”. Also the records being displayed on the “User starred questions” list should be not UserQuestion records but instead Question records. What code do I put in my controller and UserQuestion model?

class MyFavoriteQuestionsController < ApplicationController

  def index
    #list just the questions associated with current_user
  end

  def add
    #insert a row in the database for current_user and selected question
  def

  def remove
    #remove the row from the database
  end
end

Answer 1

I’d say this is typical crud if you stick with convention. Add is create, remove is destroy.

class FavouritesController < ApplicationController

  before_filter :find_user

  def index
    @favourites = @user.favourites
  end

  def create
    @question = Question.find params[:id]
    @user.favourites << @question
  def

  def destroy
    @favourite = @user.favourites.find_by_question_id params[:id]
    @favourite.destroy unless @favourite.blank?
  end
end


#routes.rb

resources :users do
  resources :favourites, :only => [:index, :create, :destroy]
end

#user.rb

has_many :user_favourites, :dependent => :destroy
has_many :favourites, :through => :user_favourites, :source => :question