Django序列化器类相互引用 [英] Django serializer classes referencing each other

问题描述

我需要有两个互相引用的序列化器类，但是如果两个类都相互引用，我将得到一个未定义的类。我创建了一个带有差异名称的类的副本，这似乎可行，但是有没有更好的方法而又不进行3个类的实现呢？

I need to have two serializer classes referencing each other but I'm getting one of the classes not defined if both classes are referencing each other. I created a duplicate of one of the class w/ a difference name and this seems to work but is there a better way to do this without making 3 classes?

class ArtistSerializer(serializers.ModelSerializer):

    name = serializers.CharField()
    class Meta:
        model = Artist
        fields = ('id', 'name',)

class TrackSerializer(serializers.ModelSerializer):

    artist = ArtistSerializer(read_only=True)
    class Meta:
        model = Track
        fields = ('id', 'artist', 'title',)

class ArtistSerializer2(serializers.ModelSerializer):

    name = serializers.CharField()
    tracks = TrackSerializer(many=True, read_only=True)
    class Meta:
        model = Artist
        fields = ('id', 'name', 'slug', 'tracks')

推荐答案

此是循环类依赖项。您的解决方案是可用的解决方法之一。另一种选择是通过使用 StringRelatedField <来避免所有循环依赖。 / a>

This is a circular class dependency. Your solution is one of the work arounds available for it. Another option is to avoid the circular dependecy all together by using a StringRelatedField

StringRelatedField可以使用其 unicode 来表示
关系的目标。

StringRelatedField may be used to represent the target of the relationship using its unicode method.

class ArtistSerializer(serializers.ModelSerializer):
    tracks = TrackSerializer(many=True, read_only=True)
    name = serializers.CharField()
    class Meta:
        model = Artist
        fields = ('id', 'name', 'slug', 'tracks')

class TrackSerializer(serializers.ModelSerializer):

    artist = StringRelatedField()  # read only by default.
    class Meta:
        model = Track
        fields = ('id', 'artist', 'title',)

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