From: Brian Candler <b.candler@...>
Date: 2010-03-28T20:47:25+09:00
Subject: Re: Help to get value from abject inside an array

Nicolas 2b wrote:
> My problem use RoR object but is ruby oriented so I post here.
> I got an array with lot of objects (type 'Product') like this (only 4
> here) :
> 
> [#<Product id: 295147, company_id: 1>, #<Product id: 303667, company_id:
> 2>, #<Product id: 279561, company_id: 9>, #<Product id: 289477,
> company_id: 4>]
> 
> What I want to do is iterate on the array and for each company_id, know
> how much products have the same company_id.
> I get the company_id like this : products.collect(&company_id).uniq
> 
> but after I don't know how to get an array like this : [1 => 22, 2 =>
> 15, 3 => 9]

company_products = Hash.new(0)
products.each { |p| company_products[p.company_id] += 1 }
p company
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