Supprimer un draft en cas de supprimer un user

init.rb

@@ -4,6 +4,7 @@
 
 ActiveSupport::Reloader.to_prepare do
   require_dependency 'redmine_drafts/issue_patch'
+  require_dependency 'redmine_drafts/user_patch'
   require_dependency 'redmine_drafts/issues_controller_patch'
 end
 

lib/redmine_drafts/user_patch.rb

@@ -0,0 +1,6 @@
+require_dependency 'principal'
+require_dependency 'user'
+
+class User < Principal
+  has_many :drafts, :dependent => :destroy
+end

spec/models/user_patch_spec.rb

@@ -0,0 +1,16 @@
+require "spec_helper"
+require File.dirname(__FILE__) + '/../../lib/redmine_drafts/user_patch'
+
+describe "UserPatch" do
+  fixtures :users
+
+  it "should delete the draft in case of cascade deleting" do
+    user = User.last
+    Draft.create(:element_type =>  Issue, user_id: user.id, element_id: 1, content: 'test')
+    Draft.create(:element_type =>  Issue, user_id: user.id, element_id: 2, content: 'MyText')
+
+    expect do
+      user.destroy
+    end.to change{ Draft.count }.by(-2)
+  end
+end