[英]How would I break up and extract an array from an array-of-hashes in Ruby on Rails?
for example: 例如:
[ (id=>1, email=>'tim@tim.com', name=>'tim'),
(id=>2, email=>'joe@joe.com', name=>'joe'),
(id=>3, email=>'dan@dan.com', name=>'dan') ]
How can I extract the email column and put it in its own array? 如何提取电子邮件列并将其放入自己的数组中?
Let's call your array users
. 我们打电话给你的阵列
users
。 You can do this: 你可以这样做:
users.map{|u| u[:email]}
This looks at the hashes one by one, calling them u
, extracts the :email
key, and returns the results in a new array of user emails. 这将逐个查看哈希值,将它们称为
u
,提取:email
键,然后在新的用户电子邮件数组中返回结果。
[ {id=>1, email=>'tim@tim.com', name=>'tim'},
{id=>2, email=>'joe@joe.com', name=>'joe'},
{id=>3, email=>'dan@dan.com', name=>'dan'} ].map{|h| h['email']}
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