Django rest framework Django Rest:基于多个查询集的序列化程序
我正在使用链接中描述的序列化程序: 我有一点不同的需求,我相信这很容易Django rest framework Django Rest:基于多个查询集的序列化程序,django-rest-framework,Django Rest Framework,我正在使用链接中描述的序列化程序: 我有一点不同的需求,我相信这很容易 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')
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 SomeWidget(models.Model):
album = models.ForeignKey(Album)
track = models.ForeignKey(Track)
name = models.CharField(max_length=100)
description = models.CharField(max_length=100)
我需要,我需要返回以下内容:
{
'album_name': 'Things We Lost In The Fire',
'artist': 'Low',
'tracks': [
'1: Sunflower',
'2: Whitetail',
'3: Dinosaur Act',
...
],
'widget': [
{
'id': '1234',
'name': 'my widget',
'description': 'my description'
}
]
}
class WidgetSerializer(serializers.ModelSerializer):
class Meta:
model = Widget
fields = ('id', 'name', 'description',)
我正在努力:
class WidgetField(serializers.RelatedField):
def to_representation(self, value):
return {
'id': '1234'
....
}
class TrackListingField(serializers.RelatedField):
def to_representation(self, value):
...
class AlbumSerializer(serializers.ModelSerializer):
tracks = TrackListingField(many=True)
widget = WidgetField()
class Meta:
model = Album
fields = ('album_name', 'artist', 'tracks')
我不断得到错误:
AssertionError: Relational field must provide a `queryset` argument, override `get_queryset`, or set read_only=`True`.
谢谢好的,明白了。这需要一点谷歌搜索/反复试验。显然,您可以重写为字段返回数据的函数 例如:
class AlbumSerializer(serializers.ModelSerializer):
widget = serializers.SerializerMethodField()
def get_widget(self, data):
return {
'id': data.id
}
或者,您可以执行以下操作:
{
'album_name': 'Things We Lost In The Fire',
'artist': 'Low',
'tracks': [
'1: Sunflower',
'2: Whitetail',
'3: Dinosaur Act',
...
],
'widget': [
{
'id': '1234',
'name': 'my widget',
'description': 'my description'
}
]
}
class WidgetSerializer(serializers.ModelSerializer):
class Meta:
model = Widget
fields = ('id', 'name', 'description',)
。。。。在AlbumSerializer.get_小部件函数中:
def get_widget(self, data):
widget = Widget.objects.get(album=data.album, track=data.track)
return WidgetSerializer(widget, many=False, context=self.context).data
最后,您不必使用函数名“get_widget”。你可以给它取任何你想要的名字。例如:
class AlbumSerializer(serializers.ModelSerializer):
widget = serializers.SerializerMethodField("fn_override")
def fn_override(self, data):
....
您可以遵循此问题中的模式: