Question

用户可以通过歌曲和电影表获得许多收藏top_songs，top_movies。用户注册用户（current_user）想要发布他最喜欢的电影和歌曲。

也许所有模型关联都是正确的，我被困在控制器和视图（表单）中。

当我提交时，我会收到错误 -

无法批量指定受保护的属性：歌曲

我怎样才能实现这一目标？所有代码都在下面。

用户模型

 class User < ActiveRecord::Base 
 attr_accessible :id, :name_special_char, :screenname, :fullname, :username, :prefix,   :firstname, :lastname,:middlename, :suffix, :age, :sex, :email,
:top_movies_attributes,:top_songs_attributes



  has_many :top_movies
  has_many :movies, through: :top_movies

  has_many :top_songs
  has_many :songs, through: :top_songs  

 accepts_nested_attributes_for :top_songs, :allow_destroy => true
 accepts_nested_attributes_for :top_movies, :allow_destroy => true

end

电影模型

class Movie < ActiveRecord::Base
  attr_accessible :name

  has_many :top_movies
  has_many :users, through: :top_movies
end

TopMovie模型

class TopMovie < ActiveRecord::Base
  belongs_to :user
  belongs_to :movie
  # attr_accessible :title, :body
end

歌曲模型

class Song < ActiveRecord::Base
  attr_accessible :name

  has_many :top_songs
  has_many :users, through: :top_songs
end

TopSong模型

class TopSong < ActiveRecord::Base
  belongs_to :user
  belongs_to :song
  # attr_accessible :title, :body
end

控制器

class MyTopFivesController < ApplicationController
  def new
    @favorites = current_user
    @favorites=@favorites.movies.build()
    @favorites=@favorites.songs.build()

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @useraccounts_my_top_fife }
    end
  end

def create
    @favorites = current_user(params[:user])
    @favorites.save!
                        # Here i have stuck. i am not sure how to save.    
end

查看表单

  <%=nested_form_for  @favorites ,:url=>favorites_path(@favorites),:method=>'post' do |f| %>
      <label >Songs</label>   
            <%= f.fields_for :songs  do |songs| %>
             <div  id="Topsongs" >
                <div class="input-control text span5 place-left ">
                    <%= songs.text_field :name,:placeholder=>"songs name.." %>
                </div>
                <div class="span1 place-left">
                    <%= songs.link_to_remove "",  :class=>"icon-minus" %>
                </div>
            </div> 
        <% end %>       
        <span > 
            <%= f.link_to_add "", :songs, :class=>"icon-plus", :data => { :target => "#Topsongs" } %>
        </span>
        <label >movies</label>    
            <%= f.fields_for :movies  do |movies| %>
                <div id="Topmovies">
                    <div class="input-control text span5 place-left ">
                        <%= movies.text_field :name,:placeholder=>"movies name.." %>
                    </div>
                    <div class="span1 place-left">
                        <%= movies.link_to_remove "",  :class=>"icon-minus" %>
                    </div>
                </div> 
            <% end %>       
        <span> 
            <%= f.link_to_add "", :movies, :class=>"icon-plus",:style=>"font-size: 14px;", :data => { :target => "#Topmovies" } %> 
        </span>

    <div class="actions">
        <%= f.submit %>
    </div>
  <% end %>

Answer 1

此处有两种设置关联的选项。您通过为顶级歌曲和热门电影创建两个连接模型而使用的一个。和其他，使用多态关联。

让我们使用多态关联。我们将使用User，Movie，Song和Favorite模型。 Favorite模型将包含多态字段。

<强> User.rb

class User < ActiveRecord::Base 
  attr_accessible :id, :name_special_char, :screenname, :fullname, :username, :prefix, :firstname, :lastname,:middlename, :suffix, :age, :sex, :email       

  has_many :favourites
  has_many :movies, through: :favourites, source: :favouritable, source_type: 'Movie'
  has_many :songs, through: :favourites, source: :favouritable, source_type: 'Song'

end

<强> Movie.rb

class Movie < ActiveRecord::Base
  attr_accessible :name

  has_many :favourites, as: :favouritable
  has_many :users, through: :favourites
end

<强> Song.rb

class Song < ActiveRecord::Base
  attr_accessible :name

  has_many :favourites, as: :favouritable
  has_many :users, through: :favourites
end

<强> Favourite.rb

class Favourite < ActiveRecord::Base
  belongs_to :users
  belongs_to :favouritable, polymorphic: true
end

我们还需要为新模型“收藏夹”创建迁移。截至目前，我们只需要3列即。 user_id, favouritable_id, favouritable_type。这里的favouritable_type和favouritable_id是多态字段。 favouritable_type是一个字符串，favouritable_id是引用类型。

迁移文件

class CreateFavourites < ActiveRecord::Migration
  def change
    create_table :favourites do |t|
     t.integer :user_id
     t.references :favouritable, polymorphic: true
     t.timestamps
    end
  end
end

现在，由于我们要将一些电影和歌曲标记为用户最喜欢的，我们可以在UsersController中放置用于构建数据的代码，而不是创建另一个控制器，或者我们也可以为{{1创建控制器}}。我将在这里使用Favourites。我正在使用更新操作来更新收藏夹，因为我们不需要任何额外的功能。如果需要，您可以添加新操作。

在UsersController.rb

UsersController

<强> edit_favourites.html.erb

def edit_favourites #or some generic name
  @user = current_user.includes(:movies, :songs)
  @movies = Movie.all
  @songs = Song.all
end

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

  if @user.update_attributes(params[:user])
    redirect_to users_path #user index page
  else
    if params[:user][:movie_ids].present? or params[:user][:song_ids].present?
      render :edit_favourites
    else
      render :edit
    end
  end
end

此外，将新操作添加到路线。

如何创建新的嵌套资源？

1 个答案: