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如何将DRY应用于Django模型，表格

[英]How to apply DRY to Django Models, forms

原文 2015-01-14 19:52:19 4 1 django/ django-models/ django-forms

I'm working on a website and simultaneously on a mobile app. 我正在一个网站上，同时也在一个移动应用程序上。

For the website I've created a Django Form for the User model which override the clean and valid_ methods to provide custom validation. 对于网站，我为User模型创建了Django表单，该表单覆盖了clean和valid_方法以提供自定义验证。

For the mobile app I'm doing a REST API which exposes and endpoint to create a new user using Tastypie for this. 对于移动应用程序，我正在执行一个REST API，该API公开并终结点以为此使用Tastypie创建新用户。

My doubt is where and how should I define the custom validation for the User model applying the DRY principle. 我的疑问是我应该在哪里以及如何使用DRY原理为用户模型定义自定义验证。

I can create a UserForm from the data provided by the user in the mobile app, then use the method is_valid() for validating the data, but the form contains a password_confirm field which is also validated and in the app this field doesn't exist. 我可以根据用户在移动应用程序中提供的数据创建UserForm，然后使用is_valid（）方法验证数据，但该表单包含password_confirm字段，该字段也经过验证，并且在应用程序中该字段不存在。

Should I create a UserForm specific for the mobile app? 我应该为移动应用程序创建一个用户窗体吗？ Should I move these validations to the model class? 我应该将这些验证移至模型类吗？

1 个解决方案

The simplest way is probably to subclass the form. 最简单的方法可能是对表单进行子类化。 Create a LoginForm that does not have the password2 field, and use that one for the mobile login API. 创建一个没有password2字段的LoginForm，并将其用于移动登录API。 Then make a subclass called WebLoginForm and add a password2 field, as well as a clean_password2() method that includes the validation logic. 然后，创建一个名为WebLoginForm的子类，并添加password2字段，以及一个包含验证逻辑的clean_password2（）方法。 That way, you won't even need to override any of your other clean() code. 这样，您甚至不需要覆盖任何其他clean（）代码。

An even easier--though hackish--solution would be to have the mobile app submit the password the user wrote both as "password1" and "password2" when it makes the API call. 甚至更容易（虽然有点骇人听闻）的解决方案是让移动应用程序在调用API时提交用户写成“ password1”和“ password2”的密码。