Ruby on Rails:如何建模"用户最喜欢的模型"

Question

我将使用StackOverflow作为我的例子.假设我有一个Question模型.登录用户可以" Question标记"a 标记为他们的最爱之一.在数据库中,这种东西可能存储在UserQuestions带有user_id字段和question_id字段的表中.这种功能不是典型的CRUD,因为实际上只有"list","add"和"delete"."用户加星标的问题"列表中显示的记录也不应是UserQuestion记录,而应是Question记录.我在控制器和UserQuestion模型中放了什么代码？

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

如果你坚持惯例,我会说这是典型的问题.添加是创建,删除是销毁.

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