How could I group by time(HH:MM) with mongoid or ruby -

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how group time(hh:mm) mongoid or ruby

i want group following data departure_at(hh:mm).

how easier rails or mongoid

expect result:

{      '06:40': [item125, item131],     '10:20': [item126],     ....

query result mongoid

[125] #<tiger _id: 811_0640_1010_tpe_kix,  to: "kix", from: "tpe", price: 4899,departure_at: 08-11 06:40:00 utc>, [126] #<tiger _id: 811_1020_0305_tpe_kix,  to: "kix", from: "tpe", price: 5450,departure_at: 08-11 10:20:00 utc>, .... [131] #<tiger _id: 812_0640_1010_tpe_kix,  to: "kix", from: "tpe", price: 4899,departure_at: 08-12 06:40:00 utc>,

first, make array of ["hh:mm", object]. can use trick this question

array = @your_objects.map{|obj| [obj.date_departure.strftime("%h:%m"), obj]}  hash[ array.group_by(&:first).map{ |k,a| [k,a.map(&:last)] } ]

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