From: Serguei Cambour <lists@...>
Date: 2013-07-21T16:21:46+09:00
Subject: Re: ActiveSupport undercore behaviour

tamouse m. wrote in post #1116149:
> On Jul 20, 2013, at 2:51 PM, Serguei Cambour <lists@ruby-forum.com>
> wrote:
>
>>                              {"Seat"=>"2", "Colour"=>18, },
>> TECHS.each_value do |value|
>> \"available_posts\"=>[{\"seat\"=>\"2\", \"colour\"=>18},
>> {\"seat\"=>\"3\", \"colour\"=>19}, {\"seat\"=>\"4\", \"colour\"=>181},
>> {\"seat\"=>\"5\", \"colour\"=>183}]}]}", nil]]
>>
>> Why are there some extra quotes and nil in the very end ? Thkx
>>
>> --
>> Posted via http://www.ruby-forum.com/.
>>
>
> Not 100% sure what you're seeing as extra quotes, but the nil is what
> you get from declaring two passed in values from the map method -- it
> only passes in the current value of the array that your original
> TECH['platform'] is pointing at, so k is current value, v is always nil.
>
> 2.0.0-p247 :008 > [1, 2, 3, 4].map{|k,v| [k,v]}
>  => [[1, nil], [2, nil], [3, nil], [4, nil]]
>
> Even if your array elements are hashes, there's still only one value
> passed in from map:
> 2.0.0-p247 :009 > [{a: 1, b: 2, c: 3}, {aa: 11, bb: 22, cc:
> 33}].map{|k,v| [k,v]}
>  => [[{:a=>1, :b=>2, :c=>3}, nil], [{:aa=>11, :bb=>22, :cc=>33}, nil]]

Thanks a lot for the reply. My hash has one value - an array of nested 
hashes, that's why I looped on that array and tried to format the keys 
with 'underscore' method. I hoped to get them formatted with 
'underscore' as follows:

ARR: [[{"assigned_name"=>"p1", "export_price"=>"usd"... etc.

but got all of them prefixed with a backslash, just before every quote:

"{\"assigned_name\"=>\"p1\"

I'd like to pass that hash to update an ActiveRecord value with 
update_attributes and it will fails with the above hashes. Any idea? 
Thank you.

-- 
Posted via http://www.ruby-forum.com/.