diff --git a/EzOnRails/lib/generators/ez_on_rails/ezapp/templates/db/migrate/create_user_group_assignments.rb.erb b/EzOnRails/lib/generators/ez_on_rails/ezapp/templates/db/migrate/create_user_group_assignments.rb.erb
index 5bf91f1..4e828bc 100644
--- a/EzOnRails/lib/generators/ez_on_rails/ezapp/templates/db/migrate/create_user_group_assignments.rb.erb
+++ b/EzOnRails/lib/generators/ez_on_rails/ezapp/templates/db/migrate/create_user_group_assignments.rb.erb
@@ -7,7 +7,7 @@ class CreateUserGroupAssignments < ActiveRecord::Migration[5.2]
     create_table :<%= EzOnRails::ApplicationRecord::TABLE_PREFIX %>user_group_assignments do |t|
       t.belongs_to :user, index: true, null: false, foreign_key: true
       t.belongs_to :group, index: true, null: false, foreign_key: { to_table: :eor_groups }
-      t.belongs_to :resource, index: true, null: true, polymorphic: true
+      t.belongs_to :resource, index: { name: '<%= EzOnRails::ApplicationRecord::TABLE_PREFIX %>user_group_assignments_resource_index' }, null: true, polymorphic: true
 
       t.belongs_to :owner, index: true, null: true, foreign_key: { to_table: :users }
 
diff --git a/Gemfile.lock b/Gemfile.lock
index b2f8362..4eacc3e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: EzOnRails
   specs:
-    ez_on_rails (0.7.4)
+    ez_on_rails (0.8.0)
       cancancan
       cocoon
       devise