What's the best way in django to update a model instance given a json representation of that model instance.
Is using deserialize the correct approach? Are there tutorials available out there?
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Have you looked at this page on serialization of models in Django?David Robinson– David Robinson2012-07-14 21:21:11 +00:00Commented Jul 14, 2012 at 21:21
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Yes - but i'm having difficulty with it. the json object i'm passing to the server doesn't have all the data in the model just a portion of it (including the pk of course). And I want to update the model based on that code.9-bits– 9-bits2012-07-14 21:28:34 +00:00Commented Jul 14, 2012 at 21:28
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1 Answer
The best approach would be to utilize one of the existing Django applications that support serializing model instances to and from JSON.
In either case, if you parse the JSON object to a Python dictionary, you can basically use the QuerySet.update() method directly.
So, say you get a dictionary where all the keys map to model attributes and they represent the values you'd want to update, you could do this:
updates = { # Our parsed JSON data
'pk': 1337,
'foo': 'bar',
'baz': 192.05
}
id = updates.pop('pk') # Extract the instance's ID
Foo.objects.filter(id=id).update(**updates) # Update the instance's data