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gestao_raul/Lib/site-packages/django_extensions/mongodb/fields/json.py

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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))