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update docs where is mentioned. Added extra tests for pre_save behaviour.
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@ -96,7 +96,11 @@ Now that snippets are associated with the user that created them, let's update o
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owner = serializers.Field(source='owner.username')
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**Note**: Make sure you also add `'owner',` to the list of fields in the inner `Meta` class.
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**Note**: Make sure you also add `'owner',` to the list of excluded fields in the inner `Meta` class, like so:
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exclude = ('owner', )
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This makes the owner field not required, which is correct, because we set it in our `pre_save()` method.
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This field is doing something quite interesting. The `source` argument controls which attribute is used to populate a field, and can point at any attribute on the serialized instance. It can also take the dotted notation shown above, in which case it will traverse the given attributes, in a similar way as it is used with Django's template language.
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@ -301,3 +301,34 @@ class TestCreateModelWithAutoNowAddField(TestCase):
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self.assertEquals(response.status_code, status.HTTP_201_CREATED)
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created = self.objects.get(id=1)
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self.assertEquals(created.content, 'foobar')
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class CommentSerializer(serializers.ModelSerializer):
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class Meta:
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model = Comment
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exclude = ('created', 'email')
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class ViewUsingPreSave(generics.CreateAPIView):
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serializer_class = CommentSerializer
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model = Comment
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def pre_save(self, obj):
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obj.email = 'overriden@address.com'
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class TestPreSave(TestCase):
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def setUp(self):
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self.view = ViewUsingPreSave.as_view()
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def test_pre_save_gets_called(self):
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"""
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The email address is set at pre_save time.
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"""
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content = {'content': 'some content'}
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request = factory.post('/', json.dumps(content),
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content_type='application/json')
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response = self.view(request).render()
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self.assertEquals(response.status_code, status.HTTP_201_CREATED)
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self.assertEquals(Comment.objects.get(pk=1).email, 'overriden@address.com')
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