这是我的 serializers.py(我想为内置的 User 模型创建一个序列化程序):
from rest_framework import serializers
from django.contrib.auth.models import User
class UserSerializer(serializers.ModelSerializer):
class Meta:
model = User
fields = ('username', 'password', 'email', )
def validate_username(self, username):
if not re.search(r'^\w+$', username): #checks if all the characters in username are in the regex. If they aren't, it returns None
raise serializers.ValidationError('Username can only contain alphanumeric characters and the underscore.')
try:
User.objects.get(username=username)
except ObjectDoesNotExist:
return username
raise serializers.ValidationError('Username is already taken.')
问题是,当我尝试使用已经存在的用户名创建用户时,它返回以下字典:
{'username': [u'This field must be unique.']}
而不是说
{'username': [u'Username is already taken']}
我为此重新创建了 validate_username 函数(用于测试目的):
def validate_username(self, username):
raise serializers.ValidationError('Testing to see if an error is raised.')
它不会引发错误。知道为什么 DjangoRestFramework 会忽略 validate_username 函数吗?
编辑:请注意,我使用的是 ModelSerializer(在此处的教程中:http: //www.django-rest-framework.org/api-guide/serializers/#validation它仅讨论了序列化器的字段级验证,而不是一个模型序列化器)。注意确定它是否有所作为。