this is my proposition to have custom data inside a model field
a json data field, the code is simple as this, and it works with
lastest django release
from django.db import models
from django.core.serializers.json import simplejson, DjangoJSONEncoder
import StringIO
class JsonField(models.Field):
__metaclass__ = models.SubfieldBase
serialize_to_string = True
def get_internal_type(self):
return "TextField"
def value_to_string(self, obj):
return self.get_prep_value(self._get_val_from_obj(obj))
def get_prep_value(self, value):
if value:
stream = StringIO.StringIO()
simplejson.dump(value, stream, cls=DjangoJSONEncoder)
value = stream.getvalue()
stream.close()
return value
return None
def to_python(self, value):
if isinstance(value, (str, unicode)):
value = StringIO.StringIO(value)
return simplejson.load(value)
return value
you can set a standard json object as data for a field, and the field
encode this as a json object when you save the model
example
obj.shopping_list = {"fruit":["apple", "banana"]}
it is also possibile to pass an ugettext_lazy object inside the
encoder, if we put a method to encode/decode lazy objects inside
DjangoJSONEncoder
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