Django模型字段由变量 [英] Django model field by variable

问题描述

快速问题。我正在尝试使用变量访问模型的一个领域。

Quick question. I'm trying yo access one of the fields of a model using a variable.

class ExampleModel(models.Model):
      the_field = models.CharField()
      the_field_two = models.CharField()

如何动态访问该字段？我尝试：

How would access the field dynamically? I tried:

model = ExampleModel.objects.get(pk=1)
fieldtoget = 'the_field'
test_var = model[fieldtoget]

但是似乎不起作用，任何想法如何会这样做吗？

But it doesn't seem to work, any ideas how I would do this?

更新：想到我会更新我的问题。我正在尝试编写一个函数（作为大函数的一部分），它不仅可以获取字段的值，还可以从变量字段名更新它。例如：

Update: Thought I'd update my question. I'm trying to write a function (as part of larger function) that can not only get the value of the field but also update it from a variable fieldname. For example:

model[fieldtoget] = 'yo'
model.save()

在PHP中，您可以使用{}包装器 - $ model {$ fieldtoget} - 作为一个例子，动态变量名希望在python中有类似的东西：）

In PHP you can use the {} wrapper - $model{$fieldtoget} - as an example, for dynamic variable names was hoping there was something similar in python :)

Cheers

推荐答案

您可以使用pythons getattr函数来做到这一点。将字段名称作为属性传递。

You can use pythons getattr function to do this. Pass the field name in as the attribute.

getattr(model, fieldtoget)

由于fieldtoget是一个变量，这是动态的。

Since fieldtoget is a variable, this is dynamic.

您可以使用setattr设置它同样的方式。

You can use setattr to set it the same way.

这篇关于Django模型字段由变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！