根据这里的文档，最好的选择是在 meta中使用extra_kwargs，例如，您有存储电话号码的UserProfile模型，并且是必需的

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

要使其正常工作，请确保您的模型已设置为blank false null false，如下所示。

some_field = models.CharField(blank=False, null=False, default='Anonymous')

你需要特别地覆盖这个字段并添加你自己的验证器。你可以在这里阅读更多的细节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

这是我处理多个字段的方法。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')
            )
        ]

这在我的后端应用程序上运行得非常好。

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}}

另一种选择是，如果您使用字符域，则使用required和trim_whitespace：

class CustomObjectSerializer(serializers.Serializer):
    name = serializers.CharField(required=True, trim_whitespace=True)

required文档：http://www.django-rest-framework.org/api-guide/fields/#required trim_whitespace文档：http://www.django-rest-framework.org/api-guide/fields/#charfield

根据link1和link2，并且由于预期字段是null=True, blank=True（就像我的示例中django.contrib.auth.models.User的email字段），这将起作用：

class UserSerializer(serializers.ModelSerializer):

    class Meta:
        model = User
        fields = ('username', 'email', 'password')
        extra_kwargs = {'email': {'required': True,
                                  'allow_blank': False}}