如何按名称设置 django 模型字段? [英] How to set django model field by name?

问题描述

这看起来应该很简单，所以我一定遗漏了一些东西.我只想按名称设置模型实例中字段的值.说我有:

This seems like it should be dead simple, so I must be missing something. I just want to set the value of a field in my model instance by name. Say I have:

class Foo(Model):
  bar = CharField()

f = Foo()

我想通过名称设置 bar 的值，而不是通过访问字段.所以就像:

I want to set the value of bar by name, not by accessing the field. So something like:

f.fields['bar'] = 'BAR"

代替

f.bar = 'BAR'

我尝试过 setattr 但它不会将值保留在数据库中.我也尝试过 _meta.fields，但在此过程中遇到了各种错误.

I've tried setattr but it doesn't persist the value in the database. I also tried going through _meta.fields but got various errors along the way.

推荐答案

如果通过setattr修改值，修改后需要记得保存模型.过去我被咬了，我改变了值但忘记保存模型，得到了相同的结果.

If you modify the value via setattr, you need to remember to save the model after modifying it. I've been bitten in the past where I changed the values but forgot to save the model, and got the same result.

setattr(f, 'bar', 'BAR')
f.save()

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