Rails，activerecord：self [：attribute]与self.attribute [英] Rails, activerecord: self[:attribute] vs self.attribute

问题描述

在rails中访问活动记录列/属性时，使用self [：attribute]与self.attribute有什么区别？这会影响吸气剂和吸气剂吗？

解决方案

它们都是获取属性的方法-它们都是吸气剂。 self.attribtue 是一个更传统的吸气剂，而 self [：attribute] 基本上只是 [] 方法。

我建议仅使用 self.attribute 方法，因为它在语法上更好但是，当其他方法覆盖 self.attribute 方法时，使用 self [：attribute] 会派上用场。 / p>

例如，假设您的用户模型的数据库列为 ，因此得到 user.name 。但是，假设您安装了一个gem，为每个模型添加了 #name 方法。为了避免复杂化，一种选择是使用 user [：name] 直接访问它，而无需通过受到破坏的方法。

When accessing active record column/attributes in rails, what is the difference between using self[:attribute] vs self.attribute? Does this affect getters and setters?

解决方案

They're both just methods to get to the attribute - they're both just getters. self.attribtue is a more "traditional" getter, whereas self[:attribute] is basically just the [] method. Switching between using either has no ramifications.

I'd recommend using only the self.attribute method because it's syntactically nicer. However, using the self[:attribute] can come in handy when something else overrides the self.attribute method.

For example, suppose you have a User model with a name database column, so you'd get user.name. But let's say you install a gem that adds a #name method to each of your models. To avoid the complication, one option is to use user[:name] to access it directly without going through the compromised method.

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