From: "Kroeger, Simon (ext)" <simon.kroeger.ext@...>
Date: 2006-08-29T00:14:01+09:00
Subject: Re: Newbie : assign a value to a variable...

 

> -----Original Message-----
> From: Jan Svitok [mailto:jan.svitok@gmail.com] 
> Sent: Monday, August 28, 2006 4:01 PM
> To: ruby-talk ML
> Subject: Re: Newbie : assign a value to a variable...
> 
> On 8/28/06, Nicolas Blanco <slainer68@gmail.com> wrote:
> > Thanks for the trick.
> >
> > But the next problem is that if params[:per_page] equals 0 
> then per_page
> > equals 0 and I get the error message "must have at least 
> one item per
> > page" from the Rails paginate option...
> 
> per_page = @params[:per_page] || 20 # default
> per_page = 20 if per_page <= 0  # validity check
> 
> or the other way round:
> 
> per_page = @params[:per_page] # assignment
> per_page = nil if per_page <= 0  # validity check
> per_page ||= 20 # default
> 
> Choose what you like best.

or get them all at once:

per_page = @params.fetch(:per_page, 0).nonzero? || 20

cheers

Simon