我一直在与此作斗争一段时间,我无法理解。我有一个使用设计的用户模型。用户可以上传歌曲,添加YouTube视频等。
我正试图让用户在设计edit registrations
视图中添加/删除歌曲和视频。
视频上传很好,但由于歌曲是播放列表的嵌套资源,属于用户,我想我已经糊里糊涂了。
音乐在相应的页面上使用相同的表单上传,但不是来自设计registration edit
视图。
路线:
devise_for :users, controllers: { registrations: "users/registrations", sessions: "users/sessions" }
resources :videos
resources :playlists do
resources :songs
end
设计注册控制器:
def edit
@song = Song.new
@video = Video.new
end
表格设计编辑注册:
<div id="user-music-box">
<p class="p-details-title"> Upload Music </p>
<%= simple_form_for [@user.playlist, @song] do |f| %>
<%= f.file_field :audio %>
<%= f.button :submit %>
<% end %>
</div>
<div id="user-video-box">
<p class="p-details-title"> Add videos </p>
<%= simple_form_for @video do |f| %>
<%= f.input :youtubeurl %>
<%= f.button :submit %>
<% end %>
</div>
正如我所说,视频(这是一个youtube url字符串)创建并保存没有问题。完全相同的歌曲形式,基本上似乎只是更新用户registration
。歌曲信息显示在服务器日志中,但不存在playlist_id,也没有任何内容被保存。
歌曲控制器:
def new
if user_signed_in?
@song = Song.new
if current_user.playlist.songs.count >= 5
redirect_to user_path(current_user)
flash[:danger] = "You can only upload 5 songs."
end
else
redirect_to(root_url)
flash[:danger] = "You must sign in to upload songs"
end
end
def create
@song = current_user.playlist.songs.new song_params
@song.playlist_id = @playlist.id
if @song.save
respond_to do |format|
format.html {redirect_to user_path(current_user)}
format.js
end
else
render 'new'
end
end
Playlist.rb
class Playlist < ActiveRecord::Base
belongs_to :user
has_many :songs, :dependent => :destroy
accepts_nested_attributes_for :songs
end
song.rb
class Song < ActiveRecord::Base
belongs_to :user
belongs_to :playlist
has_attached_file :audio
validates_attachment_presence :audio
validates_attachment_content_type :audio, :content_type => ['audio/mp3','audio/mpeg']
end
答案 0 :(得分:1)
除非您通过songs
/ playlists
通过accepts_nested_attributes_for
,否则您不应该使用registrations#edit
。我将详细介绍两种方法,以实现您想要的目标:
嵌套属性
#app/models/user.rb
class User < ActiveRecord::Base
has_many :videos
has_many :playlists
has_many :songs, through: :playlists
accepts_nested_attributes_for :videos
end
#app/models/playlist.rb
class PlayList < ActiveRecord::Base
belongs_to :user
has_and_belongs_to_many :songs
end
#app/models/song.rb
class Song < ActiveRecord::Base
has_and_belongs_to_many :playlists
end
这一点的重要性在于,要正确使用它,您可以直接编辑@user
对象,通过fields_for
帮助程序传递嵌套属性:
#config/routes.rb
devise_for :users, controllers: { registrations: "users/registrations", sessions: "users/sessions" }
#app/controllers/users/registrations_controller.rb
class Users::RegistrationsController < ApplicationController
before_action :authenticate_user!, only: [:edit, :update]
def edit
@user = current_user
@user.playlists.build.build_song
@user.videos.build
end
def update
@user = current_user.update user_params
end
private
def user_params
params.require(:user).permit(:user, :attributes, videos_attributes: [:youtubeurl], playlists_attributes: [song_ids: [], song_attributes: [:title, :artist, :etc]])
end
end
这将允许您使用:
#app/views/users/registrations/edit.html.erb
<%= form_for @user do |f| %>
<%= f.fields_for :videos do |v| %>
<%= v.text_field :youtubeurl %>
<% end %>
<%= f.fields_for :playlists do |p| %>
<%= p.collection_select :song_ids, Song.all, :id, :name %>
<%= p.fields_for :song do |s| %>
<%= f.text_field :title %>
<% end %>
<% end %>
<%= f.submit %>
<% end %>
这将为您提供单表单,您可以从中为videos
创建playlists
,songs
和@user
}。
<强>独立强>
另一个选项是单独创建对象。
这种方式优于nested attributes
,没有技术上的理由;你这样做是为了确保你的路线顺序正确等等。
作为一个注释,你需要记住路线!=模型结构。你可以拥有你想要的任何路线,只要它们为你的模型定义一个好的模式:
# config/routes.rb
authenticated :user do #-> user has to be logged in
resources :videos, :playlists, :songs #-> url.com/videos/new
end
# app/controllers/videos_controller.rb
class VideosController < ApplicationController
def new
@video = current_user.videos.new
end
def create
@video = current_user.videos.new video_params
@video.save
end
private
def video_params
params.require(:video).permit(:youtubeurl)
end
end
# app/views/videos/new.html.erb
<%= form_for @video do |f| %>
<%= f.text_field :youtubeurl %>
<%= f.submit %>
<% end %>
上述内容需要重复VideosController
Playlists
和Songs