add boolean setting to Project to allow overwritable Approvers on MRs

db/migrate/20170601233853_add_approvals_overwritable_mr_to_project.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddApprovalsOverwritableMrToProject < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  # When a migration requires downtime you **must** uncomment the following
+  # constant and define a short and easy to understand explanation as to why the
+  # migration requires downtime.
+  # DOWNTIME_REASON = ''
+
+  # When using the methods "add_concurrent_index", "remove_concurrent_index" or
+  # "add_column_with_default" you must disable the use of transactions
+  # as these methods can not run in an existing transaction.
+  # When using "add_concurrent_index" or "remove_concurrent_index" methods make sure
+  # that either of them is the _only_ method called in the migration,
+  # any other changes should go in a separate migration.
+  # This ensures that upon failure _only_ the index creation or removing fails
+  # and can be retried or reverted easily.
+  #
+  # To disable transactions uncomment the following line and remove these
+  # comments:
+  disable_ddl_transaction!
+
+  def up
+    add_column_with_default :projects, :approvals_overwritable_mr, :boolean, default: true
+  end
+
+  def down
+    remove_column :projects, :approvals_overwritable_mr
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170511101000) do
+ActiveRecord::Schema.define(version: 20170601233853) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -1144,6 +1144,7 @@ ActiveRecord::Schema.define(version: 20170511101000) do
     t.string "import_jid"
     t.integer "cached_markdown_version"
     t.datetime "last_repository_updated_at"
+    t.boolean "approvals_overwritable_mr", default: true, null: false
   end
 
   add_index "projects", ["ci_id"], name: "index_projects_on_ci_id", using: :btree