Django contrib.postgres JSONField adds additonal quotes to a dictionary.

[pypetey]

I have installed django-channels and django-cq library for async/background tasks.

JSONField from django.contrib.postgres.fields is used on the model.

And when I assign to function to do async stuff the django-cq library would be creating a task in the database.

The code is relatively simple - it creates a Task object in the database and it uses JSONField from contrib.postgres on signature field.

sig = to_signature(func, args, kwargs)
if parent is None and previous:

parent = previous.parent

task = Task.objects.create(signature={}, parent=parent, previous=previous, kw)

When I access task objcect directly then I get

task.dict
Out[2]:

{'_parent_cache': None,

'_previous_cache': None,
'_state': <django.db.models.base.ModelState at 0x83fcfd0>,
'_uncommitted_filefields': [],
'at_risk': 'N',
'details': {},
'finished': None,
'force_chain': False,
'id': UUID('40e62169-f743-47a1-95ea-ebe57acc9f38'),
'last_retry': None,
'parent_id': None,
'previous_id': None,
'result_expiry': None,
'result_ttl': 1800,
'retries': 0,
'signature': {'args': (),

'func_name': 'apps.accounts.consumers.send_email',
'kwargs': {}},

'started': None,
'status': 'P',
'submitted': datetime.datetime(2017, 2, 28, 13, 47, 46, 329656, tzinfo=<UTC>),
'waiting_on_id': None}

However, when I do refresh the instsance from db by doing task.refresh_from_db() and then task.dict

I will receive this variation which has completely different quoting on JSONField fields (signature and details)

Out[4]:
{'_state': <django.db.models.base.ModelState at 0x83fcfd0>,

'_uncommitted_filefields': [],
'at_risk': 'N',
'details': '{}',
'finished': None,
'force_chain': False,
'id': UUID('40e62169-f743-47a1-95ea-ebe57acc9f38'),
'last_retry': None,
'parent_id': None,
'previous_id': None,
'result_expiry': None,
'result_ttl': 1800,
'retries': 0,
'signature': '{"args": [], "kwargs": {}, "func_name": "apps.accounts.consumers.send_email"}',
'started': None,
'status': 'P',
'submitted': datetime.datetime(2017, 2, 28, 13, 47, 46, 329656, tzinfo=<UTC>),
'waiting_on_id': None}

What could be root cause of the problem? Is it a bug in django?

I use windows 10 pro, postgres 95, python 3.5 32bit

This ticket might be related with:
https://code.djangoproject.com/ticket/25532#no2