How to find a hash key containing a matching value

Question

Given I have the below clients hash, is there a quick ruby way (without having to write a multi-line script) to obtain the key given I want to match the cli

Answer 1

From the docs:

• (Object?) detect(ifnone = nil) {|obj| ... }
• (Object?) find(ifnone = nil) {|obj| ... }
• (Object) detect(ifnone = nil)
• (Object) find(ifnone = nil)

Passes each entry in enum to block. Returns the first for which block is not false. If no object matches, calls ifnone and returns its result when it is specified, or returns nil otherwise.

If no block is given, an enumerator is returned instead.

(1..10).detect  {|i| i % 5 == 0 and i % 7 == 0 }   #=> nil
(1..100).detect {|i| i % 5 == 0 and i % 7 == 0 }   #=> 35

This worked for me:

clients.detect{|client| client.last['client_id'] == '2180' } #=> ["orange", {"client_id"=>"2180"}] 

clients.detect{|client| client.last['client_id'] == '999999' } #=> nil 

See: http://rubydoc.info/stdlib/core/1.9.2/Enumerable#find-instance_method