add index to project package

db/migrate/20190712083208_add_index_to_project_packages.rb

@@ -0,0 +1,8 @@
+class AddIndexToProjectPackages < ActiveRecord::Migration
+  def change
+    add_index :project_packages, :creator_id
+    add_index :project_package_applies, :project_package_id
+    add_index :bidding_users, :project_package_id
+    add_index :bidding_users, :user_id
+  end
+end