[英]rest framework how to create optional nested object?
DRF 3.1.3,Django 1.8.3
我有幾個模型,就像下面的代碼:
崗位
class Post(models.Model):
class Meta:
ordering = ['-updated_time']
author = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='+')
circle = models.ForeignKey('circle')
TYPE_CHOICES = (
('M', _('Members')),
('O', _('Org')),
)
type = models.CharField(_('Type'), choices=TYPE_CHOICES, default='M', max_length=1, help_text=u"帖子類型,是成員發帖,還是組織發帖?")
created_time = models.DateTimeField(auto_now_add=True, db_index=True, editable=False)
updated_time = models.DateTimeField(auto_now=True, db_index=True, editable=False)
like = models.PositiveIntegerField(default=0)
comments = GenericRelation(PostComment)
images = GenericRelation(PostImage)
likes = GenericRelation(PostLike)
is_removed = models.BooleanField(_('Is Removed'), default=False, db_index=True)
RichPost
class RichPost(models.Model):
title = models.CharField(max_length=100)
summary = models.TextField(max_length=560)
content = models.TextField(max_length=16000)
post = models.OneToOneField(Post, related_name='rich')
SimplePost
class SimplePost(models.Model):
content = models.TextField(max_length=560)
post = models.OneToOneField(Post, related_name='simple')
PostSerializer
class PostSerializer(serializers.ModelSerializer):
images = PostImageSerializer(many=True)
simple = SimplePostSerializer(many=False)
rich = RichPostSerializer(many=False)
is_liked = serializers.SerializerMethodField('is_liked_by_user')
def create(self, validated_data):
simple = validated_data.pop('simple')
rich = validated_data.pop('rich')
post = Post.objects.create(**validated_data)
return post
def is_liked_by_user(self, obj):
request = self.context['request']
obj_type = ContentType.objects.get_for_model(obj)
if PostLike.objects.filter(author=request.user, content_type__pk=obj_type.id, object_id=obj.id).exists():
return True
else:
return False
class Meta:
model = Post
fields = ('id', 'author', 'circle', 'type', 'created_time', 'updated_time', 'like', 'is_removed',
'images', 'comments_count', 'is_liked', 'simple', 'rich')
read_only_fields = ('comments_count', 'is_liked', 'created_time', 'updated_time', 'like', 'author')
Post屬於RichPost和SimplePost之一。
當我創建帖子時,兩者都是必需的。
例如,當我發送simple.content時,rich.title,rich.summary,rich.content是必需的。
然后,我找到了api文檔: writable-nested-representations
我覆蓋.create()方法
但在嘗試訪問經過驗證的數據或保存對象實例之前 ,根本不會調用is_valid()。
有人有想法嗎?謝謝您的回答。
序列化程序中既需要豐富的帖子,也需要簡單的帖子。 您應該使它們可選。 如果您至少需要其中之一,則可以在validate()
:
class PostSerializer(serializers.ModelSerializer):
simple = SimplePostSerializer(required=False)
rich = RichPostSerializer(required=False)
...
def validate(self, data):
data = super(PostSerializer, self).validate(data)
if not any([data.get('simple'), data.get('rich')]):
raise serializers.ValidationError('Either simple or rich is required')
return data
當我從DRF 3.1.3升級到DRF 3.2.2時,我不知道發生了什么,它才有效:(
它通過.is_valid()到達.create() 。
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