Rails - May 2009 - Hash#merge in a controller

Hi all!

I have a Place model with a description attribute and a Service model
with an itinerary attribute. An itinerary is simply a string with
dash-seprated place descriptions. In my services_controller.rb#create i
have the following code:

itinerary = params[:places].merge(params[:places]){|id, place_id|
Place.find(place_id).description}

Where params[:places] is a hash like

params[:places] #=> {"1" => "3", "2" =>
"4", "3" => "3"}

in the form

{:leg_number => :place_id}

I would like to receive a Hash like the following

itinerary #=> {"1" => "San Francisco", "2"
=> "Los Angeles", "3" => "San
Francisco"}

and I use the code above to achieve that.

The code works well in script/console, while it is not working in the
controller, producing the same params[:places] array, like if the block
is not excuted.
I mean, in my controller, if I put the above code or the following

itinerary = params[:places].merge(params[:places])

i get the same result:

itinerary #=> {"1" => "3", "2" =>
"4", "3" => "3"}

Where am I wrong? Any suggestion is appreciated :-)
Thanks in advance.
-- 
Posted via http://www.ruby-forum.com/.

Mistery solved: that wasn''t an Hash, but an HashWithIndifferentAccess, 
which #merge method doesn''t accept any block :-)
A .to_hash was sufficient :-)
-- 
Posted via http://www.ruby-forum.com/.

On 09/05/2009, at 9:58 PM, Alberto Santini
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org
 > wrote:
>
> Hi all!
>
> I have a Place model with a description attribute and a Service model
> with an itinerary attribute. An itinerary is simply a string with
> dash-seprated place descriptions. In my  
> services_controller.rb#create i
> have the following code:
>
Hi. This whole email is really confusing. I suggest you try to send it  
again, but constrain yourself to being very simple and using half the  
length. Explain every step!

Blog: http://random8.zenunit.com/
Learn: http://sensei.zenunit.com/
Twitter: http://twitter.com/random8r
> itinerary = params[:places].merge(params[:places]){|id, place_id|
> Place.find(place_id).description}
>
> Where params[:places] is a hash like
>
> params[:places] #=> {"1" => "3", "2"
=> "4", "3" => "3"}
>
> in the form
>
> {:leg_number => :place_id}
>
> I would like to receive a Hash like the following
>
> itinerary #=> {"1" => "San Francisco",
"2" => "Los Angeles", "3" =>
> "San
> Francisco"}
>
> and I use the code above to achieve that.
>
> The code works well in script/console, while it is not working in the
> controller, producing the same params[:places] array, like if the  
> block
> is not excuted.
> I mean, in my controller, if I put the above code or the following
>
> itinerary = params[:places].merge(params[:places])
>
> i get the same result:
>
> itinerary #=> {"1" => "3", "2" =>
"4", "3" => "3"}
>
> Where am I wrong? Any suggestion is appreciated :-)
> Thanks in advance.
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >