Make migrations reversible

db/migrate/20151203162134_add_build_events_to_services.rb

 class AddBuildEventsToServices < ActiveRecord::Migration
-  def up
+  def change
     add_column :services, :build_events, :boolean, default: false, null: false
     add_column :web_hooks, :build_events, :boolean, default: false, null: false
   end

db/migrate/20151209144329_migrate_ci_web_hooks.rb

@@ -10,4 +10,7 @@ class MigrateCiWebHooks < ActiveRecord::Migration
       'JOIN projects ON ci_projects.gitlab_id = projects.id'
     )
   end
+
+  def down
+  end
 end

db/migrate/20151210125928_add_ci_to_project.rb

 class AddCiToProject < ActiveRecord::Migration
-  def up
+  def change
     add_column :projects, :ci_id, :integer
     add_column :projects, :builds_enabled, :boolean, default: true, null: false
     add_column :projects, :shared_runners_enabled, :boolean, default: true, null: false

db/migrate/20151210125929_add_project_id_to_ci.rb

 class AddProjectIdToCi < ActiveRecord::Migration
-  def up
+  def change
     add_column :ci_builds, :gl_project_id, :integer
     add_column :ci_runner_projects, :gl_project_id, :integer
     add_column :ci_triggers, :gl_project_id, :integer

db/migrate/20151210125930_migrate_ci_to_project.rb

@@ -14,6 +14,10 @@ class MigrateCiToProject < ActiveRecord::Migration
     migrate_ci_service
   end
+  def down
+    # We can't reverse the data
+  end
+
   def migrate_project_id_for_table(table)
     subquery = "SELECT gitlab_id FROM ci_projects WHERE ci_projects.id = #{table}.project_id"
     execute("UPDATE #{table} SET gl_project_id=(#{subquery}) WHERE gl_project_id IS NULL")

db/migrate/20151210125931_add_index_to_ci_tables.rb

 class AddIndexToCiTables < ActiveRecord::Migration
-  def up
+  def change
     add_index :ci_builds, :gl_project_id
     add_index :ci_runner_projects, :gl_project_id
     add_index :ci_triggers, :gl_project_id

db/migrate/20151210125932_drop_null_for_ci_tables.rb

 class DropNullForCiTables < ActiveRecord::Migration
-  def up
+  def change
     remove_index :ci_variables, :project_id
     remove_index :ci_runner_projects, :project_id
     change_column_null :ci_triggers, :project_id, true