topic allowed groups for pms

db/migrate/20130430052751_add_topic_allowed_groups.rb

@@ -0,0 +1,11 @@
+class AddTopicAllowedGroups < ActiveRecord::Migration
+  def change
+    create_table :topic_allowed_groups do |t|
+      t.integer :group_id, :integer, null: false
+      t.integer :topic_id, :integer, null: false
+    end
+
+    add_index :topic_allowed_groups, [:group_id, :topic_id], unique: true
+    add_index :topic_allowed_groups, [:topic_id, :group_id], unique: true
+  end
+end