Fixed: subtasks are deleted (not destroyed) when destroying parent issue (#7385).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4735 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue.rb

@@ -34,7 +34,7 @@ class Issue < ActiveRecord::Base
   has_many :relations_from, :class_name => 'IssueRelation', :foreign_key => 'issue_from_id', :dependent => :delete_all
   has_many :relations_to, :class_name => 'IssueRelation', :foreign_key => 'issue_to_id', :dependent => :delete_all
   
-  acts_as_nested_set :scope => 'root_id'
+  acts_as_nested_set :scope => 'root_id', :dependent => :destroy
   acts_as_attachable :after_remove => :attachment_removed
   acts_as_customizable
   acts_as_watchable
@@ -89,7 +89,6 @@ class Issue < ActiveRecord::Base
   before_create :default_assign
   before_save :close_duplicates, :update_done_ratio_from_issue_status
   after_save :reschedule_following_issues, :update_nested_set_attributes, :update_parent_attributes, :create_journal
-  after_destroy :destroy_children
   after_destroy :update_parent_attributes
   
   # Returns true if usr or current user is allowed to view the issue
@@ -758,14 +757,6 @@ class Issue < ActiveRecord::Base
     end
   end
   
-  def destroy_children
-    unless leaf?
-      children.each do |child|
-        child.destroy
-      end
-    end
-  end
-  
   # Update issues so their versions are not pointing to a
   # fixed_version that is not shared with the issue's project
   def self.update_versions(conditions=nil)