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Python Django REST Framework Make the REST Framework Work for You Relations

Posted by Abdul Rehman
Abdul Rehman
533 Points

Only display review id in courses list instead of review object

In my courses list, where I have added reviews in CourseSerializer but only review id display in course's reviews field instead of complete review object. As:

class CourseSerializer(serializers.ModelSerializer):
    class Meta:
        reviews = serializers.HyperlinkedRelatedField(
                    many=True,
                    read_only=True,
                    view_name='apiv2:review_detail',
        )
        fields = (
            'id',
            'title',
            'url',
            'reviews',
        )
        model = models.Course

Result:

[
    {
        "id": 1,
        "title": "Python Basics",
        "url": "https://teamtreehouse.com/library/python-basics",
        "reviews": [
            1,
            2
        ]
    },
    {
        "id": 2,
        "title": "Python Collections",
        "url": "https://teamtreehouse.com/library/python-collections",
        "reviews": []
    },
    {
        "id": 3,
        "title": "Object-Oriented Python",
        "url": "https://teamtreehouse.com/library/object-oriented-python",
        "reviews": []
    }
]
Iana Popovichenko
Iana Popovichenko
15,299 Points

Abdul, try to move the courses variable from CourseSerializer.Meta class to CourseSerializer class.

class CourseSerializer(serializers.ModelSerializer):
    reviews = serializers.HyperlinkedRelatedField(
                many=True,
                read_only=True,
                view_name='apiv2:review_detail',
    )

    class Meta:
        fields = (
            'id',
            'title',
            'url',
            'reviews',
        )
        model = models.Course

1 Answer

Alex Koumparos
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.a{fill-rule:evenodd;}techdegree
Alex Koumparos
Python Development Techdegree Student 36,887 Points
Alex Koumparos
.a{fill-rule:evenodd;}techdegree
Alex Koumparos
Python Development Techdegree Student 36,887 Points

Hi Abdul,

You have two issues. First, you have the reviews attribute defined inside Meta, it should be outside Meta but in CourseSerializer. Because reviews is defined in the wrong place, fields isn't finding your attribute, and instead is finding the reviews related name on the Course model. This is why you're still getting the right results (just not the desired format) in your API.

Second, you have a typo in the view_name kwarg. It should be "apiv2:review-detail" not "apiv2:review_detail".

Cheers

Alex