Question

我正在处理full tutorial中的Django REST Framework website，并收到一条对我没有意义的错误。

这是python会话：

>>> from snippets.models import Snippet
>>> from snippets.serializers import SnippetSerializer
>>> from rest_framework.renderers import JSONRenderer
>>> from rest_framework.parsers import JSONParser
>>> snippet = Snippet(code='foo = "bar"\n')
>>> snippet.save()
>>> snippet = Snippet(code='print "hello, world"\n')
>>> snippet.save()
>>> serializer = SnippetSerializer(snippet)
>>> serializer.data
ReturnDict([('pk', 3), ('title', u''), ('code', u'print "hello, world"\n'), ('linenos', False), ('language', 'python'), ('style', 'friendly')])
>>> content = JSONRenderer().render(serializer.data)
>>> content
'{"pk":3,"title":"","code":"print \\"hello, world\\"\\n","linenos":false,"language":"python","style":"friendly"}'
>>> from rest_framework.compat import BytesIO
>>> stream = BytesIO(content)
>>> data = JSONParser().parse(stream)
>>> serializer = SnippetSerializer(data=data)
>>> serializer.is_valid()
False
>>> serializer.errors
ReturnDict([('title', [u'This field may not be blank.'])])
>>>

以下是序列化程序的相关行：

title = serializers.CharField(
    required=False,
    max_length=100,
    )

......以及模型中的相关行：

title = models.CharField(max_length=100, blank=True, default='')

模型和序列化程序都允许“title”的空值，但错误表示空值无效。有人可以解释为什么我会看到这个吗？

Answer 1

这里应该为你做这件事:)

看看django休息框架

https://github.com/tomchristie/django-rest-framework/blob/master/rest_framework/fields.py

具体而言，行504具有以下内容：

def __init__(self, **kwargs):
        self.allow_blank = kwargs.pop('allow_blank', False)
        max_length = kwargs.pop('max_length', None)
        min_length = kwargs.pop('min_length', None)
        super(CharField, self).__init__(**kwargs)
        if max_length is not None:
            message = self.error_messages['max_length'].format(max_length=max_length)
            self.validators.append(MaxLengthValidator(max_length, message=message))
        if min_length is not None:
            message = self.error_messages['min_length'].format(min_length=min_length)
            self.validators.append(MinLengthValidator(min_length, message=message))

~~按如下方式更改serialization.CharField：~~实际上在审核教程时，是否可能错过了将allow_blank添加到需要它的其他部分...具体来说{ {1}}

SnippetSerializer

正在运行的验证是

title = serializers.CharField(
    required=False,
    max_length=100,
    allow_blank=True,
    )

您可以看到检查CharField是否为空，而不是是否需要。它是唯一一个调用空白错误消息的地方。

Django REST框架教程给出了错误，不明白为什么

1 个答案: