删除竞赛时删除竞赛下所有作品

app/models/contest.rb

@@ -6,7 +6,7 @@ class Contest < ActiveRecord::Base
   has_many :contesting_projects, :dependent => :destroy
   has_many :projects, :through => :contesting_projects
   has_many :contesting_softapplications, :dependent => :destroy
-  has_many :softapplications, :through => :contesting_softapplications
+  has_many :softapplications, :through => :contesting_softapplications, :dependent => :destroy
   has_many :projects_member, :class_name => 'User', :through => :projects
   has_many :journals_for_messages, :as => :jour, :dependent => :destroy
   has_many :acts, :class_name => 'Activity', :as => :act, :dependent => :destroy

app/models/contesting_softapplication.rb

@@ -3,7 +3,7 @@ class ContestingSoftapplication < ActiveRecord::Base
   attr_accessible :contest_id, :description, :softapplication_id, :user_id
   
   belongs_to :contest
-  belongs_to :softapplication
+  belongs_to :softapplication, :dependent => :destroy
   belongs_to :user