django rest manytomany create 

多对多创建数据时，想要创建一条被关联的数据为空的新数据，结果报错，报错如下

 

 

 

modles.py

class AuthorityEntry(models.Model):
    """
      
    """
  
    platform_services = models.CharField(max_length=64, verbose_name='平台/服务')
    level = models.IntegerField(choices=((1, 'BU'), (2, 'project')),default=1,verbose_name='级别')
    detail = models.CharField(max_length=128, verbose_name='权限详情')
    cn_detail = models.CharField(max_length=128, verbose_name='权限中文详情',null=True)
    type = models.IntegerField(choices=((1, 'ReadWrite'), (2, 'ListOnly'), (3, 'ReadOnly')),default=1,verbose_name='读写类型')
    remark = models.CharField(max_length=512, null=True,blank=True)
  

    class Meta:
        verbose_name_plural = '权限条目'


class Authority(models.Model):
    """
      
        权限条目：多对多关联权限条目表
    """
   
    project = models.TextField(verbose_name='          ',null=True)
    is_all_entries = models.BooleanField(default=False,verbose_name="是否选择全部权限条目")
    authority_entries = models.ManyToManyField(to='AuthorityEntry',verbose_name='关联权限条目',null=True)
    remark = models.CharField(max_length=512, null=True,blank=True)


    class Meta:
        verbose_name_plural = '权限项'

想要创建一个权限项  并且多对多管理的权限条目为空  走创建post请求

这是上传的data

 

postdata:

{   "effect":"1",
    "platform_services":"iam",
    "region":"*",
    "project":"*",
     "level":1,
    "is_all_entries":false,
    "authority_entries":[],
    "remark":"authority_entries 为空 "
 }

 

 

结果报错

python django python Django rest 报错该字段不能为空_post请求

 

 

序列化类：

　　

class AuthorityEntrySerializer(ModelSerializer):

    class Meta:
        model = AuthorityEntry
        fields = '__all__'


class CreateUpdateAuthoritySerializer(ModelSerializer):
    class Meta:
        model = Authority
        fields = '__all__'

修改

class CreateUpdateAuthoritySerializer(ModelSerializer):
    authority_entries=AuthorityEntrySerializer(many=True,read_only=True)
    class Meta:
        model = Authority
        fields = '__all__'

加上这句话，就可以了