Rails-使用关联定义康康能力 [英] Rails - defining cancan ability using associations

问题描述

在cancan Ability类中定义能力时...

When defining abilities in the cancan Ability class...

这是

 can :manage, Area, :location => { :company => { :manager => { :user_id => user.id } } }

与此相同:

 can :manage, Area do |area|
      area.location.company.manager.user_id == user.id
 end

我只是想更好地理解不使用障碍物就定义一个异能.一种方法(也许更快)比另一种更好吗?

I'm just trying to better understand defining an ability without using a block. Is one way better (maybe faster) than the other?

推荐答案

两者应该是相同的，但是如果其他人正在阅读您的代码，则第二种方法会更加清晰.我绝对会建议使用第二种方法.如果困扰您的是多行，您可以这样写:

The two should be the same, however the second way is much clearer if anyone else is reading your code. I would definitely recommend using the second way. If what bothers you is taking up multiple lines, you could just write:

can( :manage, Area ) {|area| area.location.company.manager.user_id == user.id }

(与其他规则堆叠在一起时)，这可能比任何其他选择都更清洁.

That's possibly cleaner (when stacked with a bunch of other rules) than either other option.

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