/ __init __（）的Django Rest Framework TypeError为关键字参数'read_only'获取了多个值

Question

This super helpful error "ATypeError at / init () got multiple values for keyword argument 'read_only'" is occurring with the following serializers

class UserSerializer(serializers.ModelSerializer):
    posts = serializers.HyperlinkedIdentityField('posts', lookup_field='username', read_only=True)

    class Meta:
        model = User
        fields = ('id', 'username', 'first_name', 'last_name', 'posts', )


class PostSerializer(serializers.ModelSerializer):
    author = UserSerializer(required=False,  read_only=True)
    photos = serializers.HyperlinkedIdentityField('photos', read_only=True)
    # author = serializers.HyperlinkedRelatedField(view_name='user-detail', lookup_field='username')

    def get_validation_exclusions(self, *args, **kwargs):
        # Need to exclude `user` since we'll add that later based off the request
        exclusions = super(PostSerializer, self).get_validation_exclusions(*args, **kwargs)
        return exclusions + ['author']

    class Meta:
        model = Post


class PhotoSerializer(serializers.ModelSerializer):
    image = serializers.Field('image.url' , read_only=True)


    class Meta:
        model = Photo

Any help please?

Answer 1

The field HyperlinkedIdentityField is always read-only , that is why it doesn't support read_only argument. Allowed arguments:

• view_name
• lookup_field
• lookup_url_kwarg
• format