Question

我的has_many：通过Releases / Products / Tracks上的关联似乎是在releases_tracks / products_tracks表中删除Track和离开的孤立关联。我无法看到我出错的地方，我认为默认行为是仅删除关联。有人可以帮忙吗？

我的模特：

 class Track < ActiveRecord::Base
   has_many :releases_tracks
   has_many :tracks, :through => :releases_tracks

   has_many :products_tracks
   has_many :products, :through => :products_tracks 
 end

 class Release < ActiveRecord::Base
   has_many :releases_tracks
   has_many :tracks, :through => :releases_tracks
 end

 class Product < ActiveRecord::Base
   has_many :products_tracks
   has_many :tracks, :through => :products_tracks
   before_save do
     self.track_ids = self.releases_track_ids
   end
 end

 class ProductsTrack < ActiveRecord::Base
   belongs_to :product
   belongs_to :track
 end

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

我的跟踪控制器（用于销毁操作）：

 class TracksController < ApplicationController
  before_filter :get_track_parent

 def destroy
   @track = @parent.tracks.find(params[:id])
   @track.destroy
   redirect_to @parent  
 end

 private

 def get_track_parent
   if params[:product_id].present?
   @parent = Product.find(params[:product_id])
   elsif params[:release_id].present?
   @parent = Release.find(params[:release_id])
   end
 end
 end

发布视图中的我的销毁链接：

 <%= link_to image_tag("icons/delete.png"), release_track_path(@release,track), :confirm => 'Are you sure?', :method => :delete %>

最后，我在产品视图中的销毁链接：

 <%= link_to image_tag("icons/delete.png"), product_track_path(@product,track), :confirm => 'Are you sure?', :method => :delete %>

Answer 1

首先，您的关联需要:dependent => :destroy选项：

class Track < ActiveRecord::Base
  has_many :releases_tracks, :dependent => :destroy
  has_many :releases, :through => :releases_tracks # also note you had here :tracks instead of :releases

  has_many :products_tracks, :dependent => :destroy
  has_many :products, :through => :products_tracks 
end

如果您希望在删除版本或产品时删除曲目，请添加以下:dependent => :destroy s：

class Release < ActiveRecord::Base
  has_many :releases_tracks, :dependent => :destroy
  has_many :tracks, :through => :releases_tracks
end

class Product < ActiveRecord::Base
  has_many :products_tracks, :dependent => :destroy
  has_many :tracks, :through => :products_tracks
  before_save do
    self.track_ids = self.releases_track_ids
  end
end

class ProductsTrack < ActiveRecord::Base
  belongs_to :product
  belongs_to :track, :dependent => :destroy
end

class ReleasesTrack < ActiveRecord::Base
  belongs_to :release
  belongs_to :track, :dependent => :destroy
end

为什么我的has_many：通过关联在删除时无法正常工作？

1 个答案: