如何在Ruby on rails上获取数组的最后一行？

Question

<%= m.members %>

这将在下面给出这个数组。如果我只想获得此数组的最后一行（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

如果我们想要得到最后和第一个元素如下：
例如： arr = [1,2,3,4]
$＆GT; arr.last =＆gt; 4
$＆GT; arr.first =＆gt; 1