#12990: New Field Type: JSONField
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Reporter: paltman | Owner: nobody
Type: New | Status: new
feature | Component: Database layer
Milestone: | (models, ORM)
Version: 1.2-beta | Severity: Normal
Resolution: | Keywords:
Triage Stage: Design | Has patch: 1
decision needed | Needs tests: 1
Needs documentation: 0 | Easy pickings: 0
Patch needs improvement: 1 |
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Comment (by Fredde):
Replying to [comment:4 Alex]:
> How are most of them wrong? It's pretty trivial (there's actually an
implementation in the tests).
The JSONField included in the in the django tests
([source:django/trunk/tests/modeltests/field_subclassing/fields.py#L56])
is actually not working properly eather. For example, when trying to store
a empty list [] or dict {} the ''JSONField.to_python'' will convert it to
None:
{{{
#python
>>> class A(models.Model):
json_field = JSONField()
>>> a = A()
>>> a.json_field = []
>>> print a.json_fied
None
}}}
I don't know how to fix this. From the documentation the following values
should be handled by the ''to_python'' method:
* An instance of the correct type (e.g., Hand in our ongoing example).
* A string (e.g., from a deserializer).
* Whatever the database returns for the column type you're using.
Hovever, there is no way to know if the value is a "correct type" a
serialized representation or the value from the database. For example
value = '[1, 2, 3]'. It could eather come from an attribute assignment, or
from the database, but it should only be deserialized if it's from the
database.
--
Ticket URL: <https://code.djangoproject.com/ticket/12990#comment:26>
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