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August 29, 2015 14:04
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group by and map on values in group thanks @mattc
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| # works in ruby 1.9 | |
| count.group_by { |o| o.site.name }.inject({}) { |m, (k,v)| m[k] = v.map(&:user_id); m } | |
| # works in ruby 2.0 and above | |
| count.group_by { |o| o.site.name }.map{ |k,v| [k, v.map(&:user_id)]}.to_h |
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