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# -*- coding: utf-8 -*-
"""
JSONField automatically serializes most Python terms to JSON data.
Creates a TEXT field with a default value of "{}". See test_json.py for
more information.
from django.db import models
from django_extensions.db.fields import json
class LOL(models.Model):
extra = json.JSONField()
"""
import datetime
from decimal import Decimal
import json
from django.conf import settings
from mongoengine.fields import StringField
class JSONEncoder(json.JSONEncoder):
def default(self, obj):
if isinstance(obj, Decimal):
return str(obj)
elif isinstance(obj, datetime.datetime):
assert settings.TIME_ZONE == "UTC"
return obj.strftime("%Y-%m-%dT%H:%M:%SZ")
return json.JSONEncoder.default(self, obj)
def dumps(value):
assert isinstance(value, dict)
return JSONEncoder().encode(value)
def loads(txt):
value = json.loads(txt, parse_float=Decimal)
assert isinstance(value, dict)
return value
class JSONDict(dict):
"""
Hack so repr() called by dumpdata will output JSON instead of
Python formatted data. This way fixtures will work!
"""
def __repr__(self):
return dumps(self)
class JSONField(StringField):
"""
JSONField is a generic textfield that neatly serializes/unserializes
JSON objects seamlessly. Main object must be a dict object.
"""
def __init__(self, *args, **kwargs):
if "default" not in kwargs:
kwargs["default"] = "{}"
StringField.__init__(self, *args, **kwargs)
def to_python(self, value):
"""Convert our string value to JSON after we load it from the DB"""
if not value:
return {}
elif isinstance(value, str):
res = loads(value)
assert isinstance(res, dict)
return JSONDict(**res)
else:
return value
def get_db_prep_save(self, value):
"""Convert our JSON object to a string before we save"""
if not value:
return super().get_db_prep_save("")
else:
return super().get_db_prep_save(dumps(value))
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