Warum funktionieren meine has_many: through-Assoziationen beim Löschen nicht korrekt?

Question

Meine has_many: durch Assoziationen auf Releases/Produkte/Tracks scheinen die Verfolgen und verwaiste Zuordnungen in den releases_tracks/products_tracks Tabellen zu löschen. Ich kann nicht sehen, wo ich falsch gelaufen bin. Ich dachte, das Standardverhalten wäre, nur die Verknüpfung zu löschen. Kann mir bitte jemand helfen?

Meine Models:

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 

My Track-Controller (für die Aktion zerstören):

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 

Mein Link in den Versionen zerstören anzuzeigen:

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

Und schließlich meine Link in der Produktansicht zerstören:

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

Answer 1

Zunächst einmal müssen Sie :dependent => :destroy Option für Ihre Verbände:

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 

Und auch, wenn Sie Spuren wollen entfernt werden, wenn Versionen oder Produkte zu entfernen, fügen Sie folgende :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