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我在令牌输入上关注了 Ryan Bate 的 Railscast，它在我的“发布”级别上完美运行，使用：

 <%= f.text_field :artist_tokens, "data-pre" => @release.artists.map(&:attributes).to_json, :class => "text" %

在发行版中，我有“曲目”，并希望能够在曲目级别修改和更改艺术家。使用上面的方法，我可以让它“继承”发布级别的艺术家，这对于新方法和初始设置来说似乎工作正常，但是在编辑时它显然会拉回发布级别的艺术家，如果提交它命中，那么所有轨道水平艺术家被覆盖。

我正在尝试这样做：

<% if params[:action] == "edit" %>
<%= f.text_field :artist_tokens, "data-pre" => @track.artists.map(&:attributes).to_json, :class => "text" %>
<% else %>
<%= f.text_field :artist_tokens, "data-pre" => @release.artists.map(&:attributes).to_json, :class => "track_artist_tokens" %>
<% end %>

但是我在@track.artists.map 上得到了一个未定义的方法“艺术家”

我的模型如下：

class Release < ActiveRecord::Base
  has_many :artist_releases
  has_many :artists, :through => :artist_releases

  attr_reader :artist_tokens

    def artist_tokens=(ids)
      self.artist_ids = ids.split(",")
    end

  has_many :releases_tracks, :dependent => :destroy
  has_many :tracks, :through => :releases_tracks

  accepts_nested_attributes_for :tracks, :reject_if => lambda { |a| a[:name].blank? }, :allow_destroy => :true

  has_many :artists_tracks

end

class Artist < ActiveRecord::Base
  has_many :artist_releases
  has_many :releases, :through => :artist_releases  
  has_many :artists_tracks
  has_many :tracks, :through => :artists_tracks
end



   class Track < ActiveRecord::Base
      has_many :releases_tracks, :dependent => :destroy
      has_many :releases, :through => :releases_tracks

      has_many :artists_tracks
      has_many :artists, :through => :artists_tracks

      attr_reader :artist_tokens
      def artist_tokens=(ids)
        self.artist_ids = ids.split(",")
      end

    end

class ArtistsTrack < ActiveRecord::Base
  belongs_to :artist
  belongs_to :release
  belongs_to :track
end

class ReleasesTrack < ActiveRecord::Base
  belongs_to :release
  belongs_to :track
  acts_as_list
end

任何人都可以帮忙吗？

更新：

释放控制器轨道方法：

def tracks
     @release = Release.find(params[:id])
     @track = @release.tracks.find(:all)
        respond_to do |format|
        format.html # tracks.html.erb
        end
  end

track.html.erb 有：

    <%= form_for @release do |f| %>
            <%= f.fields_for :tracks do |builder| %>
            <%= render 'track_fields', :f => builder %>
            <% end %>
<% end %>

_track_fields.html.erb 部分（为了清楚起见，去掉了一些 HTML）

<td class="label">Title:</td>
<td class="field"><%= f.text_field :name, :class => "text" %></td>

<td class="label">Artists:</td>
<td class="field">
    <% @track.each do |track| %>
    <%= f.text_field :artist_tokens, "data-pre" => track.artists.map(&:attributes).to_json, :class => "track_artist_tokens" %>
    <% end %>

<p><%= link_to 'Add new artist', new_artist_path, :remote => true %></p>

<td class="label">Version:</td>
<td class="field"><%= f.text_field :version, :class => "text" %></td>

<td class="label">ISRC:</td>
<td class="field"><%= f.text_field :isrc, :class => "text" %></td>

<td class="label">Remove:</td>
<td class="field"><%= f.check_box :_destroy %></td>
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1 回答 1

1

在你的show行动@track中是一个track对象。在customer动作中，它是track对象的集合。所以要么你必须遍历它们：

<% @track.each do |track| %>
  <%= f.text_field :artist_tokens, "data-pre" => track.artists.map(&:attributes).to_json, :class => "text" %>
<% end %>

或者获取track集合的第一个：

<%= f.text_field :artist_tokens, "data-pre" => @track.first.artists.map(&:attributes).to_json, :class => "text" %>
于 2012-05-01T09:49:49.940 回答