Django REST JSON API 复合文档：如何包含嵌套文档？

Question

Using Django REST JSON Api, ie djangorestframework-jsonapi==3.1.0 and having the following data structure: parent, singleChild, manyGrandChildren (all just dummy names, singleChild means one-to-one relation, manyGrandChildren means one-to-many nested relation).

...
class Parent(serializers.HyperlinkedModelSerializer):
    included_serializers = {
        'singleChild': singleChildSerializer,
        'manyGrandChildren': manyGrandChildrenSerializer,
    }

    class Meta:
        model = models.Parent
        fields = [
            'field1',
            'field2', 
            'url',
        ]

    class JSONAPIMeta:
        included_resources = ['singleChild', 'manyGrandChildren']
...

My code does not work, because I cannot access manyGrandshildren on my response, which is something like http://host.com/api/parents/1/?include=singleChild,singleChild.manyGrandChildren also please correct me if my url?include= statement is not correct.

How do I accomplish that?

Answer 1

To include grandchildren in the serializer, we need to define included_serializers and included_resources on the child serializers and include grandchildren there. In that case, we can access them from parent serializer. The naughty thing is the relationship. for one-to-many relationships we need to set 'manyGrandChildren_set' as key for included_serializers and include it as 'manyGrandChildren_set' field in class Meta fields.

example

class Child(serializers.HyperlinkedModelSerializer):
    included_serializers = {
        'manyGrandChildren_set': manyGrandChildrenSerializer,
    }

    class Meta:
        model = models.Child
        fields = [
           ...
           'manyGrandChildren_set'
           ...
        ]

    class JSONAPIMeta:
        included_resources = ['manyGrandChildren_set']


class Parent(serializers.HyperlinkedModelSerializer):
    included_serializers = {
        'singleChild': singleChildSerializer,
    }

    class Meta:
        model = models.Parent
        fields = [
            'field1',
            'field2', 
            'url',
        ]

    class JSONAPIMeta:
        included_resources = ['singleChild']