From: Mike Stok <mike@...>
Date: 2006-03-19T23:26:03+09:00
Subject: Re: String keys in hash


On 19-Mar-06, at 9:13 AM, Konlin wrote:

> Hi all,
>
> My rails app is going to count sth based on poll id in the url. The  
> url
> looks like:
> http://address.com? 
> id=dwNKiItvcyrQ5sycnIhmJablDfXsc9tshaGIVyNIei7.e7&some_other_parameter 
> s
>
> In a controller, I've created a hash where the keys are the ids:
>
> @codes = {
>          'dwNKiItvcyrQ5sycnIhmJablDfXsc9tshaGIVyNIei7.e7' =>
>          {:partner_id => 0,
>          :partner_name => 'sth',
>          :page_number => 1},
>          ...
>          }
>
> Then i do:
>
> poll_id = '"' + params['id'] + '"'
>
> The problem is, @codes[poll_id] returns nil.

You should be able to say

   @codes[params['id']]

to access the hash.

>
> Otherwise, @codes["dwNKiItvcyrQ5sycnIhmJablDfXsc9tshaGIVyNIei7.e7"]
> works ok. What am I doing wrong if the keys are the same and explicite
> string works while variable doesn't?
>
> Can you explain me that and write how to solve that problem?
>
> Thanks in advance, greetz

The quotes in @codes 
["dwNKiItvcyrQ5sycnIhmJablDfXsc9tshaGIVyNIei7.e7"] are part of Ruby's  
syntax not the string.  For example in this irb session:

ratdog:~ mike$ irb
irb(main):001:0> puts "hello"
hello
=> nil

The quotes are needed to indicate that the characters h e l l o are a  
string.  The string which ruby uses doesn't contain the quotes.

Does that help?

Mike


-- 

Mike Stok <mike@stok.ca>
http://www.stok.ca/~mike/

The "`Stok' disclaimers" apply.