Django多对多型号DRF

问题描述

我有以下模型结构：

  class Project（models.Model）：
 author = models。 ManyToManyField（Account）
 name = models.CharField（max_length = 40，default ='NewBook'）
 
 class Account（AbstractBaseUser）：
 email = models.EmailField（unique =真的）
 username = models.CharField（max_length = 40，unique = True）
 first_name = models.CharField（max_length = 40，blank = True）
 last_name = models.CharField（max_length = 40，blank = True）
 tagline = models.CharField（max_length = 140，blank = True）
 is_admin = models.BooleanField（default = False）
 created_at = models.DateTimeField（auto_now_add = 
 updated_at = models.DateTimeField（auto_now = True）
 objects = AccountManager（）
 USERNAME_FIELD ='email'
 REQUIRED_FIELDS = ['username'] 
  

我的看法如下：

  class ProjectViewSet（viewsets.ModelViewSet）：
 queryset = Project.object s.order_by（' -  name'）
 serializer_class = ProjectSerializer 
 
 def perform_create（self，serializer）：
 instance = serializer.save（author = self.request.user） 
 return super（ProjectViewSet，self）.perform_create（serializer）
  

调用视图函数在数据库中创建一个分类器。但是之后，我收到以下错误：

错误在此行中抛出：

  instance = serializer。保存（author = self.request.user）
  

任何人都可以帮助我吗？ >

解决方案

这里有两个问题：

1. 显示M2M领域的：

所以你需要添加许多= True 到 AccountSerializer ：

  author = AccountSerializer（read_only = True，required = False，many = 
  

1. A ：




所以，如果你看这个例子和文档似乎需要实现创建或更新方法。




I have the following model structure:

class Project(models.Model):
  author = models.ManyToManyField(Account)
  name = models.CharField(max_length=40, default='NewBook')

class Account(AbstractBaseUser):
  email = models.EmailField(unique=True)
  username = models.CharField(max_length=40, unique=True)
  first_name = models.CharField(max_length=40, blank=True)
  last_name = models.CharField(max_length=40, blank=True)
  tagline = models.CharField(max_length=140, blank=True)
  is_admin = models.BooleanField(default=False)
  created_at = models.DateTimeField(auto_now_add=True)
  updated_at = models.DateTimeField(auto_now=True)
  objects = AccountManager()
  USERNAME_FIELD = 'email'
  REQUIRED_FIELDS = ['username']

My view looks like this:

class ProjectViewSet(viewsets.ModelViewSet):
  queryset = Project.objects.order_by('-name')
  serializer_class = ProjectSerializer

  def perform_create(self, serializer):
    instance = serializer.save(author=self.request.user)
    return super(ProjectViewSet, self).perform_create(serializer)

After calling the view function, a classifier gets created in the database. But after that, I get the following error:

The error gets thrown in this line:

instance = serializer.save(author=self.request.user)

Anyone how can help me with this?

解决方案

There are two problems here:

1. Showing nested relationships for M2M field:

So you need to add many=True to AccountSerializer:

author = AccountSerializer(read_only=True, required=False, many=True)

1. A writable nested serializer:

So if you look at the example and the documentation it seems that you need to implement create or update method.

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