map()

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1 Topic by bg000331 2012-04-23 23:45:22

bg000331
Ticketholder
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Registered: 2011-10-25
Posts: 21

Topic: map()

Hi,
how can i map first_name and last_name to full_name?

works:

users = user.friendships.map(&:first_name).join(", ")

not working

users = user.friendships.map(&:first_name, :last_name).join(", ")

thanks for helping

pete

2 Reply by Javix 2012-04-24 03:40:18

Javix
Engineer
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From: Belgium
Registered: 2008-11-25
Posts: 1,357

Re: map()

What are the relations between User and Friendship models?
What are the attributes in the both models?

I suppose that ONE user has MANY friendships; In this case, when you call 'friendships' on a 'user':

users = user.friendships

you will get an Array of Friendship objects. And of course, calling (mapping) 'first_name' and 'last_name' methods on Friendship object raise an exception. You should call those methods on a User object if you have corresponding attributes/columns/methods defined in User model.