参考官网:https://www.django-rest-framework.org/api-guide/relations/#nested-relationships
先建立model
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', on_delete=models.CASCADE) order = models.IntegerField() title = models.CharField(max_length=100) duration = models.IntegerField() class Meta: unique_together = ('album', 'order') ordering = ['order'] def __str__(self): return '%d: %s' % (self.order, self.title)
嵌套关系可以通过使用序列化器作为字段来表示。
如果该字段用于表示to-many关系(意思是:外键在另外一个model,不懂的话,下面例子会补充),则应该将many=True标志添加到序列化器字段中。
如下ModelSerializer序列化:
class TrackSerializer(serializers.ModelSerializer): class Meta: model = Track fields = ('order', 'title', 'duration') class AlbumSerializer(serializers.ModelSerializer): tracks = TrackSerializer(many=True, read_only=True) #刚才上面说的就是这里,外键在Track上,不知道你懂不懂 class Meta: model = Album fields = ('album_name', 'artist', 'tracks')
默认情况下,嵌套序列化器是只读的。如果希望支持对嵌套序列化器字段的写操作,则需要创建create()和/或update()方法,以便显式指定应该如何保存子关系。
如果要实现可写,就要去掉read_only=true,同时添加create方法,如下:
class TrackSerializer(serializers.ModelSerializer): class Meta: model = Track fields = ('order', 'title', 'duration') class AlbumSerializer(serializers.ModelSerializer): tracks = TrackSerializer(many=True) class Meta: model = Album fields = ('album_name', 'artist', 'tracks') def create(self, validated_data): tracks_data = validated_data.pop('tracks') album = Album.objects.create(**validated_data) for track_data in tracks_data: Track.objects.create(album=album, **track_data) return album
#必须有create,才能使用save(), data={...} ,比如:
a=IdcSerializer(data=data)
a.save()