Question

我希望在rails应用程序中分享用户之间的课程。用户A已经创建了一些课程，并希望与用户B＆amp; C.用户A创建课程，添加用户B＆amp; C到课程，他们现在可以看到课程。我的问题是如何让共享课程出现在用户B＆amp; C共享页面？每节课都属于笔记本。

notebook.rb

belongs_to :user
has_many :lessons, :dependent => :destroy

lesson.rb

belongs_to :notebook
has_many :shareships
has_many :users, through: :shareships, dependent: :destroy
attr_reader :user_tokens
accepts_nested_attributes_for :shareships, :reject_if => lambda { |a| a[:user_ids].blank? }
scope :shared, lambda { where('shared_ids = ?')

user.rb

has_many :notebooks, dependent: :destroy

shareship.rb

belongs_to :lesson
belongs_to :user

lessons_controller.rb

class LessonsController < ApplicationController
  before_filter :authorize, :find_notebook
  load_and_authorize_resource :through => :notebook, :except => [:public]
  respond_to :html, :js, :json 


  def create
    @lesson = @notebook.lessons.build(params[:lesson])
    @lesson.user_id = current_user.id
    flash[:notice] = 'lesson Added!.' if @lesson.save
    respond_with(@lesson, :location => notebook_lessons_path)
  end


    def shared
      @user = current_user
      @shared = @notebook.lessons
    end
end

我已经设置了用户和课程之间的多对多关联，因此用户可以将其他用户添加到课程中，但我正在尝试找出如何列出共享用户的课程。任何想法我怎么能让这个工作？我无法设置它和我的控制器和视图。

Answer 1

我会做这样的事情

<强> notebook.rb

has_many :lessons
belongs_to :user

<强> lesson.rb

belongs_to :notebook
has_many :shareships
has_many :users, through: :shareships, dependent: :destroy # shared users of this lesson, not the owner

<强> user.rb

has_many :notebook # the user will go through the notebook to get the lesson he owns
has_many :shareships
has_many :lessons, through: :shareships, dependent: :destroy # this would be only the shared lessons he has access to

<强> shareship.rb

belongs_to :lesson
belongs_to :user

用户可以通过

访问他拥有的课程

/:user_id/notebooks/:notebook_id/lesson/:lesson_id 
# lessons = user.notebooks[:notebook_id].lessons

他可以通过

访问与他分享的课程

/:user_id/shared_lessons/:lesson_id
# shared_lessons = user.lessons

用户无法直接访问他所拥有的课程，他需要浏览他的笔记本。但他可以直接访问共享课程。

你觉得怎么样？

Rails从多对多关联访问信息

1 个答案: