我正在使用 drf 開發休息 api，我正在嘗試在帖子詳細信息 api 上顯示評論。我查看了嵌套的序列化程序，但無法在我的項目中實施。如何使用嵌套序列化程序來顯示評論？我得到了這個錯誤：NameError: name 'CommentSerializer' is not defined有我的代碼：-評論模型class Comment(models.Model): post = models.ForeignKey(Post, on_delete=models.CASCADE, related_name='comments') author = models.ForeignKey(CustomUser, on_delete=models.CASCADE) content = models.TextField(max_length=255) created_at = models.DateTimeField(auto_now_add=True) parent = models.ForeignKey('self', null=True, blank=True, on_delete=models.CASCADE) is_active = models.BooleanField(default=True) class Meta: ordering = ('-created_at',) def __str__(self): retun f'Comment by {self.author.username} on {self.post}' def children(self): return Comment.objects.filter(parent=self) @property def is_parent(self): if self.parent is not None: return False return True-崗位模型class Post(models.Model): author = models.ForeignKey(get_user_model(), on_delete=models.CASCADE) image = models.ImageField(upload_to=upload_location,blank=True, null=True) title = models.TextField(max_length=30, null=True, blank=True) slug = models.SlugField(unique=True, blank=True) created_at = models.DateTimeField(default=timezone.now) star_rate = models.FloatField(default=0.0) def __str__(self): return self.slug def get_absolute_url(self): return reverse('post-detail', kwargs={'slug':self.slug})-serializers.pyclass PostDetailSerializer(serializers.ModelSerializer): image = SerializerMethodField() author = SerializerMethodField() comments = CommentSerializer(source='comments.content') class Meta: model = Post fields = ('author', 'image', 'title', 'created_at','star_rate', 'slug', 'comments') def get_image(self, obj): try: image = obj.image.url except: image = None return image def get_author(self, obj): return obj.author.username
1 回答
慕絲7291255
TA貢獻1859條經驗 獲得超6個贊
你的代碼是顛倒的。被引用的實體在被引用之前需要被定義。將 CommentSerializer 類放在 PostDetailSerializer 類之前。
class CommentSerializer(serializers.ModelSerializer):
reply_count = SerializerMethodField()
author = SerializerMethodField()
class Meta:
model = Comment
fields = ('content', 'parent', 'author', 'reply_count', 'post')
def get_reply_count(self, obj):
if obj.is_parent:
return obj.children().count()
return 0
def get_author(self, obj):
return obj.author.username
class PostDetailSerializer(serializers.ModelSerializer):
image = SerializerMethodField()
author = SerializerMethodField()
comments = CommentSerializer(source='comments.content')
class Meta:
model = Post
fields = ('author', 'image', 'title', 'created_at','star_rate', 'slug', 'comments')
def get_image(self, obj):
try:
image = obj.image.url
except:
image = None
return image
def get_author(self, obj):
return obj.author.username
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