Sorting array with multiple fields in Rails

Question

Consider the below hash

[
{:rank => 3, :time => "3.00 AM" , :name => "JJJ"},
{:rank => 1, :time => "3.05 AM" , :name => "AAA"},
{:rank => 5, :time => "2.55 AM" , :name => "XXX"},
{:rank => 2, :time => "3.10 AM" , :name => "BBB"}
]

How do i sort the fields in an order, so that i will obtain result as like query
(Consider if we fetch values in has is from a table)

select * from my_table order by rank, time, name

Please comment if i am not clear.

Thanks

Ivaylo Strandjev · Accepted Answer · 2012-04-12 13:26:46Z

5

a = [
{:rank => 3, :time => "3.00 AM" , :name => "JJJ"},
{:rank => 1, :time => "3.05 AM" , :name => "AAA"},
{:rank => 5, :time => "2.55 AM" , :name => "XXX"},
{:rank => 2, :time => "3.10 AM" , :name => "BBB"}
]
res = a.sort_by{|t| [t[:rank], t[:time], t[:name]]}

answered Apr 12, 2012 at 13:26

Ivaylo Strandjev

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4 Comments

Alan Over a year ago

Thanks izomorphius... as i am having time field as string, time sorting is not working.. any solution for this?

DGM Over a year ago

You could use the Chronic gem: res = a.sort_by{|t| [t[:rank], Chronic.parse(t[:time]), t[:name]]}

Alan Over a year ago

izomorphius thanks for the answer.. but what should i do to sort the time field in either direction.. if i tried to give like res = a.sort_by{|t| [t[:rank], -t[:time], t[:name]]} it throws an error!! any suggestions..?

Ivaylo Strandjev Over a year ago

@cometbalan a few suggestions can be found here: ruby-forum.com/topic/224672 I do not know of any really short way to do that.

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