Django基于多个字段（文件字段）验证表单

发布于 2024-10-02 04:24:08 字数 168 浏览 3 评论 0原文

django 有没有办法根据多个字段验证表单。我见过一些例子，人们建议重写表单的 clean 方法，并在无法满足自定义验证时引发 ValidationError 。对我来说，问题是我不确定您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来访问它们，而您无权在表单的 clean 方法中访问请求对象。

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若相惜即相离 2024-10-09 04:24:08

您所描述的方法（从 Form.clean 中引发 ValidationError）是执行多字段验证。

您可以在 clean 方法中从 self.files 访问上传的文件。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 {}
        ...

The method you've described (raising ValidationError from within Form.clean) is the official way to do multi-field validation.

You can access uploaded files from self.files within the clean method. From 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 {}
        ...

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