[英]Django foreign key rest framework
有沒有辦法在視圖的“likedBy”部分顯示用戶名,而不是用戶名? 使用 django rest 框架從我得到的觀點來看,忽略評論:
[
{
"id": 3,
"title": "ddsa",
"content": "dsadsa",
"created": "2021-02-10T08:07:42.758400Z",
"updated": "2021-02-10T08:07:42.758400Z",
"author": 1,
"category": [
{
"pk": 1,
"name": "Life"
}
],
"likedBy": [
1
],
"comments": [
{
"id": 2,
"content": "ghfa",
"created": "2021-02-10T08:08:02.407950Z",
"post": 3,
"author": 1,
"likedBy": [
1
]
}
]
}
]
視圖.py:
class PostViewSet(FlexFieldsMixin, generics.ListAPIView):
queryset = Post.objects.all()
serializer_class = PostSerializer
permit_list_expands = ['category', 'comments']
模型.py
class Post(models.Model):
title = models.CharField(max_length=255)
content = models.TextField()
category = models.ManyToManyField(Category, related_name='posts')
author = models.ForeignKey(User, on_delete=models.CASCADE)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
likedBy = models.ManyToManyField(User, related_name='posts', blank=True)
class Meta:
ordering = ['-created']
序列化器.py:
class PostSerializer(FlexFieldsModelSerializer):
class Meta:
model = Post
fields = '__all__'
expandable_fields = {
'category': ('blogApi.CategorySerializer', {'many': True}),
'comments': ('blogApi.CommentSerializer', {'many': True}),
}
如何序列化 ManyToMany 字段以顯示文本值
鑒於您沒有序列化關系,而是與您的用戶相關的 model 的屬性,我相信您必須使用serializer.SerializerMethodField()
。 這允許您執行以下操作:
class PostSerializer(FlexFieldsModelSerializer):
liked_by = serializers.SerializerMethodField(method_name="get_user_likes")
class Meta:
model = Post
fields = (
"title",
"content",
"category",
"author",
"created",
"update",
"liked_by"
)
expandable_fields = {
'category': ('blogApi.CategorySerializer', {'many': True}),
'comments': ('blogApi.CommentSerializer', {'many': True}),
}
@classmethod
def get_user_likes(obj):
# do whatever you like here, but I tend to call a
# method on my model to keep my serializer file
# nice and tidy
# you'll need to define a UserSerializer
return UserSerializer(obj.get_user_likes(), many=True, read_only=True)
在您的帖子 model 中:
class Post(models.Model):
title = models.CharField(max_length=255)
content = models.TextField()
category = models.ManyToManyField(Category, related_name='posts')
author = models.ForeignKey(User, on_delete=models.CASCADE)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
likedBy = models.ManyToManyField(User, related_name='posts', blank=True)
class Meta:
ordering = ['-created']
def get_user_likes(self):
return self.likedBy.all()
您當然可以在序列化程序中定義完整的方法,但正如我所說,我希望序列化程序盡可能干凈,並將與模型關聯的所有方法放在我的 models.py 中。
@classmethod
def get_user_likes(obj):
# you'll need to define a UserSerializer
return UserSerializer(obj.likedBy.all(), many=True, read_only=True)
所以你可以設置
likedBy = serializers.ReadOnlyField(source='get_likedBy')
在您的 PostSerializer class 並在您的帖子 model ZA2F2ED4F8EBC04614C21A29D 中定義 function
@property
def get_likedBy(self):
liked_by = []
for user in self.users_liked_post.all():
liked_by.append(user.name)
return liked_by
只需使用正確的 related_name 而不是 users_liked_post
如果將 likedBy 添加到可擴展字段,然后將?expand=likedBy
添加到 url,它應該會為您提供您在UserSerializer
中概述的所有信息,或者編寫一個名為LikedBySerializer
的新序列化程序。 同樣作為一般規則,盡量不要使用'__all__'
這是泄漏數據的好方法。 快樂編碼!
class LikedBySerializer(FlexFieldsModelSerializer):
class Meta:
model = User
fields = '__all__'
class PostSerializer(FlexFieldsModelSerializer):
class Meta:
model = Post
fields = '__all__'
expandable_fields = {
'category': ('blogApi.CategorySerializer', {'many': True}),
'comments': ('blogApi.CommentSerializer', {'many': True}),
'likedBy': ('blogApi.LikedBySerializer', {'many': True}),
}
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