django rest framework 表单中的字段级验证

Question

我正在使用 ModelViewSet 和 TemplateHTMLRenderer 来使用表单和处理 'post' 方法。当我尝试呈现字段错误时，呈现的错误是 [u'This field may not be blank.']。如何让它呈现简单消息 'This...'?

在 html、

<form action="." method="post" id="myform">
     <input name="first_name" type="text">
     <ul> {{ errors.first_name }}</ul>
</form>

在 views.py、

class UserViewSet(viewsets.ModelViewSet):
   queryset = User.objects.all()
   serializer_class = UserSerializer
   renderer_classes = (renderers.JSONRenderer, renderers.TemplateHTMLRenderer)
   template_name = 'account.html'

   def list(self, request, *args, **kwargs):
     response = super(AccountViewSet, self).list(request, *args, **kwargs)
     if request.accepted_renderer.format == 'html':
        return Response({'data': response.data}, template_name=self.template_name)
     return response

   def create(self, request):
     serializer = self.serializer_class(data=request.data)
     if serializer.is_valid():
        User.objects.create_user(**serializer.validated_data)
        return Response(serializer.validated_data)
     return Response({'errors': serializer.errors})

并且我在 serializer.py 中覆盖了 rest framework 的默认必需错误消息，但它似乎忽略了自定义必需的错误消息并显示了默认必需的错误消息，例如 'This field may not be blank..'.

在serializer.py,

class UserSerializer(serializers.ModelSerializer):
     first_name = serializers.RegexField(regex=r'^[a-zA-Z -.\'\_]+$',       
            required=True,
            error_messages={'required': _('Please enter your first name.'),
                            'invalid': _('Please enter a valid name.')})

这是怎么回事？

Answer 1

错误不会出现，因为 DRF 最初是运行字段验证。如果这些验证失败，则会显示默认错误。

根据源代码，默认错误消息存储在 default_error_messages 字典中。以下是一些代码片段：

字段:

class Field(object):   
    default_error_messages = {
        'required': _('This field is required.'),
        'null': _('This field may not be null.')
    }

字符字段:

class CharField(Field):
    default_error_messages = {
        'blank': _('This field may not be blank.'),
        'max_length': _('Ensure this field has no more than {max_length} characters.'),
        'min_length': _('Ensure this field has at least {min_length} characters.')
    }

正则表达式字段:

class RegexField(CharField):
    default_error_messages = {
        'invalid': _('This value does not match the required pattern.')
    }

因此，您可以做的是通过覆盖序列化程序的 __init__ 方法来覆盖 default_error_messages 值并提供您的自定义错误消息。

class UserSerializer(serializers.ModelSerializer):
     first_name = serializers.RegexField(regex=r'^[a-zA-Z -.\'\_]+$',       
            required=True)

     def __init__(self, *args, **kwargs):
         super(UserSerializer, self).__init__(*args, **kwargs)

         self.fields['first_name'].error_messages['required'] = 'Please enter your first name.'
         self.fields['first_name'].error_messages['invalid'] = 'Please enter a valid name.'

django rest framework 表单中的字段级验证

django rest framework field level validation in form

django

validation

field

django-rest-framework