Django REST框架:嵌套关系:non_field_errors

Question

在Django-REST框架项目中,我尝试使用嵌套关系,并在可浏览的API Web视图中获得"non_field_errors".

代码来自文档的这一部分:http://www.django-rest-framework.org/api-guide/relations#nested-relationships

models.py:

from django.db import models

class Album(models.Model):
    album_name = models.CharField(max_length=100)
    artist = models.CharField(max_length=100)

class Track(models.Model):
    album = models.ForeignKey(Album, related_name='tracks')
    order = models.IntegerField()
    title = models.CharField(max_length=100)
    #duration = models.IntegerField()

    class Meta:
        unique_together = ('album', 'order')
        ordering = ('order',)

    def __unicode__(self):
        return '%d: %s' % (self.order, self.title)

serializers.py:

from rest_framework import serializers
from myapp.models import Album, Track

class TrackSerializer(serializers.ModelSerializer):
    class Meta:
        model = Track
        fields = ('order', 'title')

class AlbumSerializer(serializers.ModelSerializer):
    tracks = TrackSerializer(many=True)

    class Meta:
        model = Album
        fields = ('album_name', 'artist', 'tracks')

错误(在../albums):

Track输入字段标记为红色,并显示错误消息:non_field_errors.

单击OPTIONS按钮可显示实际且正确的数据结构:

轨道嵌套有适当的属性

可浏览浏览器视图的原始数据输入显示:

{
    "album_name": "", 
    "artist": "", 
    "tracks": null
}

发布一些有效的原始数据实际上是有效的.但是,如果Web界面表单也能正常工作,那就更好了.特别是因为我想知道是否有一些有趣的事情发生了.

先感谢您!

Answer 1

我也经历过这个问题。消除错误的一种方法是使用：

class AlbumSerializer(serializers.ModelSerializer):
    tracks = serializers.RelatedField(many=True)

    class Meta:
        model = Album
        fields = ('album_name', 'artist', 'tracks')

但是，这会删除嵌套的轨道字段并仅显示轨道的字符串表示形式。

编辑：我明白了。你想要的是这样的：

class AlbumSerializer(serializers.ModelSerializer):

    class Meta:
        model = Album
        fields = ('album_name', 'artist', 'tracks')
        read_only_fields = ('tracks',)
        depth = 1

这将导致轨道嵌套，而不会引发 UI 错误。