Python Django如何检查对象是否具有属性
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Django how to check if the object has property in view
提问by Mirage
I am trying to get the documents property in a general function, but a few models may not have the documents attribute. Is there any way to first check if a model has the documents property, and then conditionally run code?
我试图在通用函数中获取文档属性，但一些模型可能没有文档属性。有没有办法先检查模型是否具有文档属性，然后有条件地运行代码？
if self.model has property documents:
context['documents'] = self.get_object().documents.()
采纳答案by kaezarrex
You can use hasattr()to check to see if model has the documents property.
您可以使用hasattr()来检查模型是否具有文档属性。
if hasattr(self.model, 'documents'):
doStuff(self.model.documents)
However, this answerpoints out that some people feel the "easier to ask for forgiveness than permission" approach is better practice.
但是，这个答案指出，有些人认为“请求宽恕比许可更容易”的方法是更好的做法。
try:
doStuff(self.model.documents)
except AttributeError:
otherStuff()
