How to map more than one Attribute with ActiveRecord?

Question

If I type in my console

u = User.first u.friends(&map:username) 

I get ["Peter", "Mary", "Jane"] but I also want to show the birthday, so how do I do that? I tried

u.friends(&map:username, &map:birthday) 

but this doesn't work.

Answer 1

You can use the alternate block syntax:

u.friends.map{|f| [f.username, f.birthday]} 

which would give an array of arrays.

u.friends.map{|f| "#{f.username} - #{f.birthday}"} 

would give you an array of strings. You can do quite a bit from there.

Answer 2

With ActiveRecord >= 4 you can simply use:

u.friends.pluck(:username, :birthday)