Django's F objects does not perform JSON lookups. A ticket has been raised
for the same https://code.djangoproject.com/ticket/29769
I have written a customer expression for querying JSONField and
* it works!*
class KeyTextTransformFactory:
def __init__(self, key_name):
self.key_name = key_name
def __call__(self, *args, **kwargs):
return KeyTextTransform(self.key_name, *args, **kwargs)
class JSONF(F):
def resolve_expression(self, query=None, allow_joins=True, reuse=None,
summarize=False, for_save=False):
rhs = super().resolve_expression(query, allow_joins, reuse, summarize,
for_save)
field_list = self.name.split(LOOKUP_SEP)
for name in field_list[1:]:
rhs = KeyTextTransformFactory(name)(rhs)
return rhs
It is necessary to include Cast in rhs,
Sample.objects.filter(jsonfield__lookup__value=Cast(JSONF('value'),
IntegerField()))
Comment ref: https://code.djangoproject.com/ticket/29769#comment:5
Note: This is my first contribution in Django source code, any
comments/suggestions would help me learn the process better.
Thank you,
Mani
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