Django 覆盖模型 Clean() 与 Save()-Python问题

Django Overriding Model Clean() vs Save()(Django 覆盖模型 Clean() 与 Save())

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问题描述

保存模型时，我有几个操作要执行，尤其是从管理员那里.我将几个字段大写并检查以确保一个字段或另一个字段已填写.我还创建了现场蛞蝓.现在，这些在覆盖 clean 和 save 函数之间是分开的.它现在有效，但我很好奇何时使用它们.我浏览了文档，但找不到具体何时使用.

I have a couple of actions to perform when saving a models, especially from the admin. I capitalize a couple of fields and check to make sure that either one field or the other is filled. I also create the field slug. RIght now these are split between overriding the clean and the save functions. It works now, but I am curious on when to use each. I looked through the docs, and I couldn't find specifically which to use when.

推荐答案

您应该使用 clean 来完成与验证相关的工作，并解析/更改/以其他方式清理输入.大写字段和生成 slug 可能会发生在这里.我还使用 clean 将 post_type 之类的字段强制为代理模型中的特定值.如果你在 clean 中引发 django.core.exceptions.ValidationError('error text')，'error text' 会被添加到 form.non_field_errors.


You should use clean to do validation-related work, and to parse/change/otherwise clean the input.  Capitalizing fields and generating a slug can happen here.  I also use clean to force a field like post_type to a specific value in proxy models.  If you raise django.core.exceptions.ValidationError('error text') inside clean, the 'error text' is added to the  form.non_field_errors.  
保存是更改模型实际保存方式的地方.例如，我使用 save 来创建上传图片的裁剪.ValidationError 如果在此处提出，则不会被捕获，我觉得这是两者之间最重要的实际区别.
Save is the place to change the way a model is actually saved.  For instance, I've used save to create a crop of an uploaded picture.  ValidationErrors are not caught if raised here, and I feel like that's the most important practical difference between the two. 

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