python - Django Rest Framework 中的序列化器字段过滤？

Question

在我的serializers.py中我可以这样做:

class BoxSerializer(serializers.ModelSerializer):
    user = serializers.ReadOnlyField(source='user.email')
    playlist = PrimaryKeyRelatedField(allow_null=True, source='playlist.name',
        queryset=Playlist.objects.all(), required=False)

    class Meta:
        model = Box

我什至可以做这样的事情(硬编码，但有效):

playlist = PrimaryKeyRelatedField(allow_null=True, source='playlist.name',
            queryset=Playlist.objects.filter(user=User.objects.get(id=4)), required=False)

我对此很陌生，我想知道是否有一种方法可以通过某种方法或类似的方法来 request.user:

(我知道这是不正确的，这只是为了表达我的观点):

playlist = PrimaryKeyRelatedField(allow_null=True, source='playlist.name',
            queryset=Playlist.objects.filter(user=request.user), required=False)

或者我可以做这样的事情(同样不正确):

playlist = PrimaryKeyRelatedField(allow_null=True, source='playlist.name',
        queryset='get_playlists', required=False)

def get_playlists(self):
    user = self.context['request'].user
    return Playlist.objects.filter(user=user)

Answer 1

试试这个:

class BoxSerializer(serializers.ModelSerializer):
    # ...

    def __init__(self, *args, **kwargs):
        user = kwargs['context']['request'].user

        super(BoxSerializer, self).__init__(*args, **kwargs)
        self.fields['playlist'].queryset = Playlist.objects.filter(user=user)