我在CanCan gem for rails中找到了这段代码:
def initialize(user)
can do |action, subject_class, subject|
user.permissions.find_all_by_action(aliases_for_action(action)).any? do |permission|
permission.subject_class == subject_class.to_s &&
(subject.nil? || permission.subject_id.nil? || permission.subject_id == subject.id)
end
end
end
我知道方法可以多次调用,但是参数是怎么传的呢?变量action
、subject_class
和subject
启动在哪里?