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Add a JSONProperty to your Model to save a dict to the datastore

/ Published in: Python
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  1. from google.appengine.ext import db
  2. from google.appengine.api import datastore_types
  3. from django.utils import simplejson
  4. class JSONProperty(db.Property):
  5.     def get_value_for_datastore(self, model_instance):
  6.         value = super(JSONProperty, self).get_value_for_datastore(model_instance)
  7.         return self._deflate(value)
  8.     def validate(self, value):
  9.         return self._inflate(value)
  10.     def make_value_from_datastore(self, value):
  11.         return self._inflate(value)
  12.     def _inflate(self, value):
  13.         if value is None:
  14.             return {}
  15.         if isinstance(value, unicode) or isinstance(value, str):
  16.             return simplejson.loads(value)
  17.         return value
  18.     def _deflate(self, value):
  19.         return simplejson.dumps(value)
  20.     data_type = datastore_types.Text
  21.  
  22.  
  23. class Person(db.Model):
  24.     address_book = JSONProperty()
  25. person = Person(address_book = {
  26.     "alice": { "phone": "555-555-5555", "email": "[email protected]" } })
  27. person.address_book["bob"] = { "email": "[email protected]" }
  28. person.put()
  29. ...
  30. some_person = db.get(key)
  31. logging.info("Phone number for alice is " + some_person.address_book["alice"]["phone"])

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