Fix for postgresql

db/migrate/20161201160452_migrate_project_statistics.rb

@@ -17,7 +17,7 @@ class MigrateProjectStatistics < ActiveRecord::Migration
   end
 
   def down
-    add_column_with_default :projects, :repository_size, :float, default: 0.0
-    add_column_with_default :projects, :commit_count, :integer, default: 0
+    add_column :projects, :repository_size, :float, default: 0.0
+    add_column :projects, :commit_count, :integer, default: 0
   end
 end

db/migrate/20161212142807_add_lower_path_index_to_routes.rb

@@ -17,6 +17,6 @@ class AddLowerPathIndexToRoutes < ActiveRecord::Migration
   def down
     return unless Gitlab::Database.postgresql?
 
-    remove_index :routes, name: :index_on_routes_lower_path
+    remove_index :routes, name: :index_on_routes_lower_path if index_exists?(:routes, name: :index_on_routes_lower_path)
   end
 end

db/migrate/20170130204620_add_index_to_project_authorizations.rb

@@ -8,4 +8,8 @@ class AddIndexToProjectAuthorizations < ActiveRecord::Migration
   def up
     add_concurrent_index(:project_authorizations, :project_id)
   end
+
+  def down
+    remove_index(:project_authorizations, :project_id)
+  end
 end

db/migrate/20170305203726_add_owner_id_foreign_key.rb

@@ -5,7 +5,11 @@ class AddOwnerIdForeignKey < ActiveRecord::Migration
 
   disable_ddl_transaction!
 
-  def change
+  def up
     add_concurrent_foreign_key :ci_triggers, :users, column: :owner_id, on_delete: :cascade
   end
+
+  def down
+    remove_foreign_key :ci_triggers, column: :owner_id
+  end
 end