text: # Copyright (c) 2016 Presslabs SRL
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #    http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  
  
  from django.db import models
  from django.utils import timezone
  
  
  class UnsavedForeignKey(models.ForeignKey):
      allow_unsaved_instance_assignment = True
  
  
  class AutoDateTimeField(models.DateTimeField):
      def pre_save(self, model_instance, add):
          return timezone.now()
  