Primary key default value missing in schema dump

[felixbuenemann]

The default value for primary keys is lost when dumping the schema with schema_plug 1.5.1 and rails 4.1.2rc1 in a project that uses uuids:

-  create_table "assets", id: :uuid, default: "uuid_generate_v4()", force: true do |t|
+  create_table "assets", id: :uuid, force: true do |t|