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字段名“Field_name”对模型无效

django-rest-framework python

0

Lutaaya Huzaifah Idris · 技术社区 · 4 年前

我有以下博客文章的序列化程序:

class TagSerializer(serializers.ModelSerializer):
    """Tag Serializer."""
    owner = serializers.ReadOnlyField(source='owner.username')
    posts = serializers.PrimaryKeyRelatedField(many=True, read_only=True)

    class Meta:
        model = Tag
        fields = ('id', 'name', 'owner', 'posts',)


class PostSerializer(serializers.ModelSerializer):
    """Post Serializer"""
    owner = serializers.ReadOnlyField(source='owner.username')
    comments = serializers.PrimaryKeyRelatedField(many=True, read_only=True)

    class Meta:
        model = Post
        fields = ('id', 'title', 'body', 'owner', 'comments', 'tags', )

以及以下型号:

class Post(TimeStampedModel, models.Model):
    """Post model."""
    title = models.CharField(_('Title'), max_length=100, blank=False, null=False)
    body = models.TextField(_('Body'), blank=False)
    owner = models.ForeignKey(User, related_name='posts',
                              on_delete=models.CASCADE)

    class Meta:
        ordering = ['created']

    def __str__(self):
        """
        Returns a string representation of the blog post.
        """
        return f'{self.title} {self.owner}'


class Tag(models.Model):
    """Tags model."""
    name = models.CharField(max_length=100, blank=False, default='')
    owner = models.ForeignKey(User, related_name='tags_owner',
                              on_delete=models.CASCADE)
    posts = models.ManyToManyField('Post', related_name='tags_posts',
                                   blank=True)

    class Meta:
        verbose_name_plural = 'tags'

    def __str__(self):
        """
        Returns a string representation of the category post.
        """
        return f'{self.name}'

我想知道我为什么会收到这个错误:

我什么时候得到博客帖子列表

最后是我的看法:

class PostList(generics.ListCreateAPIView):
    """Blog post lists"""
    queryset = Post.objects.all()
    serializer_class = serializers.PostSerializer
    permission_classes = [permissions.IsAuthenticatedOrReadOnly]

    def perform_create(self, serializer):
        serializer.save(owner=self.request.user)

1 回复 | 直到 4 年前

1

2

Nick ODell 4 年前

这是由两段代码引起的。

首先,您的标记模型:

class Tag(models.Model):
    [...]
    posts = models.ManyToManyField('Post', related_name='tags_posts',
                                   blank=True)

其次,您的后期序列化程序:

class PostSerializer(serializers.ModelSerializer):
    [...]

    class Meta:
        model = Post
        fields = (... 'tags', )

您的帖子序列化程序需要一个名为“tags”的字段。在ManyToManyField中,您将相关的_名称设置为“tags_posts”。这两个字段不匹配,导致了问题。您必须将要序列化的字段更改为tags\u post,或者更改相关的\u名称,如下所示:

class Tag(models.Model):
    [...]
    posts = models.ManyToManyField('Post', related_name='tags',
                                   blank=True)

What is related_name used for?