From: Brian Candler <b.candler@...>
Date: 2010-12-15T03:42:35+09:00
Subject: Re: do your bit for my mental health - how to find the difference between two strings?

Iain Barnett wrote in post #968364:
> I have a piece of code that doesn't work in a Sinatra app I've been
> writing that doesn't work.
>
> These two forms don't work:
>
> get '/tweets/:service/' do
>
>   mymethod( params[:service] )
> ...
>
> get '/tweets/:service/' do
>
>   service = params[:service]
>   mymethod( service )
> ...
>
>
> This works:
>
> get '/tweets/:service/' do
>
>   mymethod( 'servicename' )
>
> so does this:
>
> get '/tweets/:service/' do
>
>   service = 'servicename'
>   mymethod( service )
>
>
> Using the params[:service] variable then mymethod fails to do what I
> expect. If I hard-code the string that it's supposed to represent, it
> works. Every way I've examined this variable it looks exactly the same
> as a hard-coded version.

If you're using ruby 1.9, then there are hidden qualities to strings :-( 
So I suggest you try:

    STDERR.puts service.inspect, service.encoding

Apart from that, I guess it's possible that there's something else in 
the program's environment which is different between your two test runs. 
To minimise these differences, I suggest

    service = params[:service]
    service.replace('servicename')    # <<<<
    STDERR.puts service.inspect, service.encoding
    mymethod( service )

Try running this with the marked line present, and with that line 
commented out.

HTH,

Brian.

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