Django基于多个字段（文件字段）验证表单

Question

django中有没有办法根据多个字段验证表单。我看过一些例子，人们建议覆盖表单的clean方法，如果无法满足自定义验证，则会引发ValidationError。对我来说问题是我不确定你是否可以检查文件是否是从clean方法中上传的。我只能使用请求对象访问它们，并且您无法访问表单的clean方法中的请求对象。

Answer 1

您所描述的方法（在ValidationError内提出Form.clean）是执行multi-field validation的官方方式。

您可以在self.files方法中访问clean上传的文件。来自django/forms/forms.py：

class BaseForm(StrAndUnicode):
    # This is the main implementation of all the Form logic. Note that this
    # class is different than Form. See the comments by the Form class for more
    # information. Any improvements to the form API should be made to *this*
    # class, not to the Form class.
    def __init__(self, data=None, files=None, ...):
        self.is_bound = data is not None or files is not None
        self.data = data or {}
        self.files = files or {}
        ...