Adds STI to Query model. Issue queries are now IssueQuery instances.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10964 e93f8b46-1217-0410-a6f0-8f06a7374b81

db/migrate/20121209123234_add_queries_type.rb

@@ -0,0 +1,9 @@
+class AddQueriesType < ActiveRecord::Migration
+  def up
+    add_column :queries, :type, :string
+  end
+
+  def down
+    remove_column :queries, :type
+  end
+end

db/migrate/20121209123358_update_queries_to_sti.rb

@@ -0,0 +1,9 @@
+class UpdateQueriesToSti < ActiveRecord::Migration
+  def up
+    ::Query.update_all :type => 'IssueQuery'
+  end
+
+  def down
+    ::Query.update_all :type => nil
+  end
+end