django serializer 定制error_message

class CreateManagerSerializers(serializers.ModelSerializer):
    username = serializers.CharField(validators=[UniqueValidator(
        queryset=models.Manager.objects.all(),
        message=‘名称重复‘
    )])
    password = serializers.CharField(write_only=True)

==>在传入库里面已经有的名字时,显示错误信息

{
"username": [
"名称重复"
]
}

class Meta:
    model = models.Manager
    fields = [‘username‘, ‘password‘, ‘email‘, ‘mobile_number‘, ‘role_num‘, ‘channel‘]
    extra_kwargs = {
        ‘username‘:{‘validators‘:[UniqueValidator(
            queryset=models.Manager.objects.all(),
            message=‘名称重复‘)]},
        ‘email‘: {‘validators‘: [UniqueValidator(
            queryset=models.Manager.objects.all(),
            message=‘email重复‘)]},
    }

==>错误信息和上面一样

{
"username": [
"名称重复"
],
"email": [
"email重复"
]
}

class CreateManagerSerializers(serializers.ModelSerializer):
    username = serializers.CharField()
    password = serializers.CharField(write_only=True)    
    def validate_username(self,value):
        from rest_framework.exceptions import ValidationError
        flag=models.Manager.objects.filter(username=value).exists()
        if flag:
            raise ValidationError(‘用户名称重复‘)
        return value

==>报错信息

{
"username": [
"用户名称重复"
],
"email": [
"email重复"
]
}