CODEWITHSUNDEEP
rubyactiverecord
user676567
user676567

Reputation: 1139

Iterating over two arrays at once

Does anyone know how i can iterate over two arrays and match id's from one to the other? I have an Array - @household with a unique id called idhouseholds and would like to tag a field from my @events array to the end of the @household array using the id from @events array.

Upvotes: 0

Views: 370

Answers (2)

CubaLibre
CubaLibre

Reputation: 1703

It seems like what you are looking for is a 'natural join' of two arrays.

In that case, here is something that might work for you:

@household.product(@events).each.map { |x| x if x[0].id == x[1].id }.compact

The code above does a Cartesian product of the two arrays (which gives ALL [household, event] pairs) and then filters out the elements with matching id's.

Of course, if you had an association using the id field, you wouldn't need to do this, it would be handled by the ORM layer.

Upvotes: 4

dexter
dexter

Reputation: 13593

How about this..

@household.each do |household_elt|
 matching_event = @events.select { |event| event.id == household_elt.idhouseholds }.first
 #do the tagging with matching_event
end

Upvotes: 0

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