how to make ruby block return an array of variable in the block?

Question

in a ruby block:

user.trips.each { |trip| trip.pickedpost.user }

How can I make the code return an array of users?

If I run the block

user.trips.each { |trip| puts trip.pickedpost.user }

irb shows

#<User:0x007fd1ab9e2148>
#<User:0x007fd1aacf3dd8>
 => [#<Trip id: 18, pickedpost_id: 25, volunteer_id: 33, created_at: "2012-05-14 23:28:36",    updated_at: "2012-05-14 23:28:36">, #<Trip id: 20, pickedpost_id: 20, volunteer_id: 33, created_at: "2012-05-15 00:12:39", updated_at: "2012-05-15 00:12:39">]

the block returns an array of trip object, which is not what I want.

How can I make the block return an user array?

Thanks

Michael Berkowski · Accepted Answer · 2012-05-15 03:04:10Z

3

Looks like what you want is to .collect() it:

user.trips.collect { |trip| trip.pickedpost.user }

Or using .map()

user.trips.map(&:pickedpost).map(&:user)

edited May 15, 2012 at 3:04

answered May 15, 2012 at 2:53

Michael Berkowski

271k47 gold badges452 silver badges395 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

alexZ Over a year ago

Thank you, that solves my problem! user.trips.map(&:pickedpost).map(&:user)

Matheus Moreira Over a year ago

user.trips.map { |trip| trip.pickedpost.user } might not be as elegant but should be more efficient since it only iterates over the array once.

Collectives™ on Stack Overflow

how to make ruby block return an array of variable in the block?

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related