serialize queryset via django-rest-framework

Question

I try to use updating version of DRF. I used code from tutorial

serializer = SnippetSerializer(Snippet.objects.all(), many=True)
serializer.data

I should get

[{
  'pk': 1, 'title': u'', 'code': u'foo = "bar"\n', 'linenos': False, 
  'language': u'python', 'style': u'friendly'
 }, {
  'pk': 2, 'title': u'', 'code': u'print "hello, world"\n', 'linenos': False, 
  'language': u'python', 'style': u'friendly'
}]

but I got:

[OrderedDict([
  ('pk', 1), ('title', u''), ('code', u'foo = "bar"\n'), 
  ('linenos', False), ('language', 'python'), ('style', 'friendly')
 ]), 
 OrderedDict([
  ('pk', 2), ('title', u''), ('code', u'print "hello, world"\n'), ('linenos', False), 
  ('language', 'python'), ('style', 'friendly')
 ])
]

Please explain how get correctly results?

Result is correct. OrderedDict is like a normal dictionary (that you expect), except it will retain its order, which a normal dictionary does not do. Other than this, it works exactly like a normal dictionary. In case you wonder, OrderedDict is from python's collections module (docs.python.org/3/library/collections.html). — spectras
– spectras, Commented Jun 26, 2015 at 12:52
What results aren't correct? You can convert an OrderedDict to a dict by calling dict(serializer.data), but then you lose any field ordering. — Kevin Brown-Silva
– Kevin Brown-Silva, Commented Jun 26, 2015 at 15:55
when I did dict(serializer.data) got ValueError: dictionary update sequence element #0 has length 6; 2 is required — AlexYar
– AlexYar, Commented Jun 29, 2015 at 7:07

Sergei · Accepted Answer · 2015-11-12 10:33:06Z

3

if you need valid json, you can do

import json
serializer = SnippetSerializer(Snippet.objects.all(), many=True)
json.dumps(serializer.data)

answered Nov 12, 2015 at 10:33

Sergei

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1 Comment

Mihai Zamfir Over a year ago

Actually this is better: from rest_framework.renderers import JSONRenderer json = JSONRenderer().render(serializer.data)

Community · Accepted Answer · 2017-05-23 12:09:05Z

1

Results are correct. DRF explicitly uses OrderedDict in the serialization process.

OrderedDict:

OrderedDict is a subclass of dict. You can perform all the operations of a normal python dictionary on an OrderedDict.

As per the docs,

Ordered dictionaries are just like regular dictionaries but they remember the order that items were inserted. When iterating over an ordered dictionary, the items are returned in the order their keys were first added.

Also, if you need a regular python dictionary, you can use dict() on serializer.data as Kevin also suggested.

dict(serializer.data)  # Converts to regular python dict

edited May 23, 2017 at 12:09

CommunityBot

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answered Jun 27, 2015 at 5:44

Rahul Gupta

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1 Comment

Mihai Zamfir Over a year ago

Wrong. You can't call dict on serializer.data because it is of type rest_framework.utils.serializer_helpers.ReturnList

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