我通过DRF制作了django项目。
在我与DRF的斗争中,我开始怀疑是否可以序列化这些模型。
models.py
class Post(models.Model):
author = models.ForeignKey(User, related_name='related_postwriter')
title = models.CharField(max_length=200, blank = False)
text = models.TextField(blank = True)
created_date = models.DateTimeField(
default=timezone.now
)
point = models.PointField(null=False, blank=True)
def __str__(self): # __unicode__ on Python 2
return self.title
class Comment(models.Model):
post = models.ForeignKey('blog.Post', related_name='related_comments')
author = models.ForeignKey(User, related_name='related_commentwriter')
text = models.TextField(max_length=500)
created_date = models.DateTimeField(default=timezone.now)
def __str__(self):
return self.text
Comment模型中有两个ForeignKey字段,我想这可能是serializer.py很难处理的原因。
serializers.py
class UserSerializer(serializers.ModelSerializer):
posts = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
comments = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
class Meta:
model = User
fields = ('id', 'username', 'email', 'posts')
class PostSerializer(serializers.ModelSerializer):
class Meta:
model = Post
fields = ('id', 'author', 'title', 'text', 'point')
def create(self, validated_data):
validated_data['author'] = self.context['request'].user
return super(PostSerializer, self).create(validated_data)
class CommentSerializer(serializers.ModelSerializer):
class Meta:
model = Comment
fields = ('id', 'post', 'author', 'text')
def create(self, validated_data):
validated_data['author'] = self.context['request'].user
return super(CommentSerializer, self).create(validated_data)
我想comments = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
也必须放在class PostSerializer(serializers.ModelSerializer):
中,但是当我按照我的想法放置时,会出现错误AssertionError at /posts/
The field 'comments' was declared on serializer PostSerializer, but has not been included in the 'fields' option.
,所以当我发表评论时#39}在像
class PostSerializer(serializers.ModelSerializer):
comments = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
class Meta:
model = Post
fields = ('id', 'author', 'title', 'text', 'point', 'comments')
然后, - >发生AttributeError at /posts/
'Post' object has no attribute 'comments'
。
我的错是什么?
因为我想制作Android应用,用户可以阅读帖子和与帖子相关的评论'在同一时间(像几乎社区网站,reddit,脸书...),我发布的 serializers.py 是不够的。我发布的 serializers.py 似乎不足以反映帖子和评论之间的关系。
评论模型有问题吗?或者我错了吗?
我是新手,编程新手,请教我。
感谢阅读。
答案 0 :(得分:2)
没有错,你只是访问错误的属性。如果您查看模型,请为帖子定义相关名称:
@json(decodeBase64(triggerBody()['ContentData']))
因此,当您编写序列化程序时,您应该访问的“字段”应该是相关名称而不是注释。将序列化程序更改为:
post = models.ForeignKey('blog.Post', related_name='related_comments')
答案 1 :(得分:1)
您可以使用Nested relationships