mediagoblin/db/sql/extratypes.py

   1 # GNU MediaGoblin -- federated, autonomous media hosting
   2 # Copyright (C) 2011,2012 MediaGoblin contributors.  See AUTHORS.
   3 #
   4 # This program is free software: you can redistribute it and/or modify
   5 # it under the terms of the GNU Affero General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU Affero General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU Affero General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17
  18 from sqlalchemy.types import TypeDecorator, Unicode
  19
  20
  21 class PathTupleWithSlashes(TypeDecorator):
  22     "Represents a Tuple of strings as a slash separated string."
  23
  24     impl = Unicode
  25
  26     def process_bind_param(self, value, dialect):
  27         if value is not None:
  28             assert len(value), "Does not support empty lists"
  29             value = '/'.join(value)
  30         return value
  31
  32     def process_result_value(self, value, dialect):
  33         if value is not None:
  34             value = tuple(value.split('/'))
  35         return value