Remove keep_default from add_field

            "new_tablespace": self.quote_name(new_db_tablespace),

        })

    def add_field(self, model, field, keep_default=False):

    def add_field(self, model, field):

        """

        Creates a field on a model.

        Usually involves adding a column, but may involve adding a

        self.execute(sql, params)

        # Drop the default if we need to

        # (Django usually does not use in-database defaults)

        if not keep_default and field.default is not None:

        if field.default is not None:

            sql = self.sql_alter_column % {

                "table": self.quote_name(model._meta.db_table),

                "changes": self.sql_alter_column_no_default % {