Merge pull request #10404 from chadmoone/fix-pg-uuid-default

Allow override of PostgreSQL UUID primary key default

activerecord/test/cases/adapters/postgresql/uuid_test.rb

@@ -82,3 +82,34 @@ def test_id_allows_default_override_via_nil
     assert_nil col_desc["default"]
   end
 end
+
+class PostgresqlUUIDTestNilDefault < ActiveRecord::TestCase
+  class UUID < ActiveRecord::Base
+    self.table_name = 'pg_uuids'
+  end
+
+  def setup
+    @connection = ActiveRecord::Base.connection
+
+    @connection.reconnect!
+
+    @connection.transaction do
+      @connection.create_table('pg_uuids', id: false) do |t|
+        t.primary_key :id, :uuid, default: nil
+        t.string 'name'
+      end
+    end
+  end
+
+  def teardown
+    @connection.execute 'drop table if exists pg_uuids'
+  end
+
+  def test_id_allows_default_override_via_nil
+    col_desc = @connection.execute("SELECT pg_get_expr(d.adbin, d.adrelid) as default
+                                    FROM pg_attribute a
+                                    LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum
+                                    WHERE a.attname='id' AND a.attrelid = 'pg_uuids'::regclass").first
+    assert_nil col_desc["default"]
+  end
+end