Rails：从模型方法访问字段值

Question

Where title is a field on the table in the database, why does calling @title return nil ? 如果title是数据库表中的一个字段，为什么调用@title返回nil ？

Unbelievably, accessing model fields from inside a method on that model is undocumented. 令人难以置信的是，未记录从该模型上的方法内部访问模型字段的信息。

Answer 1

Think about how you would access the info from outside the model: 考虑一下如何从模型外部访问信息：

model_instance.field_name

Therefore, from within the model you simply call 因此，您只需在模型中调用

field_name

you can call instance methods from within that instance. 您可以从该实例中调用实例方法。