我有输入专辑的表格以及属于专辑的歌曲。相册正在保存到数据库,但单个歌曲不保存。
专辑模型
class Album < ActiveRecord::Base
belongs_to :user
has_many :songs, :dependent => :destroy
accepts_nested_attributes_for :songs
has_attached_file :image, :styles => { :large => "500x500>", :medium => "300x300>", :thumb => "100x100>" }
validates :image, presence: true
validates :title, presence: true
extend FriendlyId
friendly_id :title, use: :slugged
end
歌曲模型
class Song < ActiveRecord::Base
belongs_to :album
extend FriendlyId
friendly_id :title, use: :slugged
end
专辑控制器
class AlbumsController < ApplicationController
before_action :set_album, only: [:show, :edit, :update, :destroy]
before_action :authenticate_user!, except: [:index, :show]
before_filter :verify_is_admin, except: [:index, :show]
def index
@albums = Album.all.order("created_at DESC").paginate(:page => params[:page], :per_page => 8)
end
def show
end
def new
@album = current_user.albums.build
3.times { @album.songs.build }
end
def edit
end
def create
@album = current_user.albums.build(album_params)
if @album.save
redirect_to @album, notice: 'Album was successfully created.'
else
render action: 'new'
end
end
def update
if @album.update(album_params)
redirect_to @album, notice: 'Album was successfully updated.'
else
render action: 'edit'
end
end
def destroy
@album.destroy
redirect_to albums_url
end
private
def verify_is_admin
(current_user.nil?) ? redirect_to(root_path) : (redirect_to(root_path) unless current_user.admin?)
end
# Use callbacks to share common setup or constraints between actions.
def set_album
@album = Album.find_by_slug(params[:id])
end
def correct_user
@album = current_user.albums.find_by(id: params[:id])
redirect_to albums_path, notice: "Not authorized to edit this album" if @album.nil?
end
# Never trust parameters from the scary internet, only allow the white list through.
def album_params
params.require(:album).permit(:title, :image, :embed, :embed_html)
end
end
歌曲控制器
class SongsController < ApplicationController
before_action :set_song, only: [:show, :edit, :update, :destroy]
def index
@songs = Song.all
end
def show
end
def new
@song = Song.new
end
def edit
end
def create
@song = Song.new(song_params)
respond_to do |format|
if @song.save
format.html { redirect_to @song, notice: 'Song was successfully created.' }
format.json { render action: 'show', status: :created, location: @song }
else
format.html { render action: 'new' }
format.json { render json: @song.errors, status: :unprocessable_entity }
end
end
end
def update
respond_to do |format|
if @song.update(song_params)
format.html { redirect_to @song, notice: 'Song was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: @song.errors, status: :unprocessable_entity }
end
end
end
def destroy
@song.destroy
respond_to do |format|
format.html { redirect_to songs_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_song
@song = Song.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def song_params
params.require(:song).permit(:title)
end
end
以下是新专辑视图的表单
<%= form_for @album, html: { multipart: true } do |f| %>
<% if @album.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@album.errors.count, "error") %> prohibited this album from being saved:</h2>
<ul>
<% @album.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="form-group">
<%= f.label :Artwork %>
<%= f.file_field :image, class: "form-control" %>
</div>
<div class="form-group">
<%= f.label :title %>
<%= f.text_field :title, class: "form-control" %>
</div>
<div class="form-group">
<%= f.fields_for :songs do |builder| %>
<fieldset>
<%= builder.label :title, "Song" %><br />
<%= builder.text_field :title, :rows => 3 %>
</fieldset>
<% end %>
</div>
<div class="form-group">
<%= f.submit class: "btn btn-primary" %>
</div>
<% end %>
答案 0 :(得分:2)
你需要告诉你关于歌曲参数的强大参数:
def album_params
params.require(:album).permit(:title, :image, :embed, :embed_html,
:songs_attributes => [:id, :_destroy, :title])
end
不要忘记包含您希望能够更新的所有歌曲属性。