django-rest-framework如何使模型序列化器字段成为必需

Question

我有一个模型,我一步一步填写,这意味着我正在制作一个表单向导.

因此,此模型中的大多数字段都是必需的,但null=True, blank=True在提交部分数据时必须避免引发非空错误.

我正在使用Angular.js和django-rest-framework,我需要告诉api x和y字段应该是必需的,如果它们是空的,它需要返回验证错误.

Answer 1

这里根据文档的最佳选择是在Meta类中使用extra_kwargs,例如,你有UserProfile模型存储电话号码,是必需的

class UserProfileSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserProfile
        fields = ('phone_number',)
        extra_kwargs = {'phone_number': {'required': True}} 

Answer 2

您需要专门覆盖该字段并添加自己的验证器.您可以在此处阅读更多详细信息http://www.django-rest-framework.org/api-guide/serializers/#specifying-fields-explicitly.这是示例代码.

def required(value):
    if value is None:
        raise serializers.ValidationError('This field is required')

class GameRecord(serializers.ModelSerializer):
    score = IntegerField(validators=[required])

    class Meta:
        model = Game

Answer 3

这在我的后端应用程序上非常有效。

class SignupSerializer(serializers.ModelSerializer):
        """ Serializer User Signup """
        class Meta:
            model = User
            fields = ['username', 'password', 'password', 'first_name', 'last_name', 'email']
            
            extra_kwargs = {'first_name': {'required': True, 'allow_blank': False}}
            extra_kwargs = {'last_name': {'required': True,'allow_blank': False}}
            extra_kwargs = {'email': {'required': True,'allow_blank': False}}

Answer 4

这是我多种领域的方式.它基于重写UniqueTogetherValidator.

from django.utils.translation import ugettext_lazy as _
from rest_framework.exceptions import ValidationError
from rest_framework.utils.representation import smart_repr
from rest_framework.compat import unicode_to_repr

class RequiredValidator(object):
    missing_message = _('This field is required')

    def __init__(self, fields):
        self.fields = fields

    def enforce_required_fields(self, attrs):

        missing = dict([
            (field_name, self.missing_message)
            for field_name in self.fields
            if field_name not in attrs
        ])
        if missing:
            raise ValidationError(missing)

    def __call__(self, attrs):
        self.enforce_required_fields(attrs)

    def __repr__(self):
        return unicode_to_repr('<%s(fields=%s)>' % (
            self.__class__.__name__,
            smart_repr(self.fields)
        ))

用法:

class MyUserRegistrationSerializer(serializers.ModelSerializer):

    class Meta:
        model = User
        fields = ( 'email', 'first_name', 'password' )
        validators = [
            RequiredValidator(
                fields=('email', 'first_name', 'password')
            )
        ]