如何在Ruby on Rails中获取数组的最后一行？

Question

<%= m.members %> 

下面给出了这个数组。如果我只想得到这个数组的最后一行（Ray的记录），我该如何编码？

[#<User id: 4, username: "John", age: 27, deleted_at: nil>, 
#<User id: 8, username: "Mike", age: 27, deleted_at: nil>, 
#<User id: 13, username: "Ray", age: 27, deleted_at: nil>] 

Answer 1

[#<User id: 4, username: "John", age: 27, deleted_at: nil>, 
#<User id: 8, username: "Mike", age: 27, deleted_at: nil>, 
#<User id: 13, username: "Ray", age: 27, deleted_at: nil>].last 

如果我们想获得最后和第一要素如下：
例：ARR = [1,2,3,4]
$>arr.last => 4
$>arr.first => 1