From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2008-12-24T02:05:04+09:00
Subject: Re: Loading up a hash with variables if they are defined

On Tue, Dec 23, 2008 at 5:51 PM, Patrick Doyle <wpdster@gmail.com> wrote:
> Is there a cleaner, more Rubyesque way to do this?
>
>  # Return a hash of the navigation parameters
>  def nav_params
>    params = {}
>
>    params[:prefix]      = @prefix      if @prefix
>    params[:category_id] = @category_id if @category_id
>    params[:page]        = @page        if @page
>
>    params
>  end
>
> I want to load a parameters hash with the contents of some instance
> variables, but only if they are defined.
>


irb(main):005:0> {:prefix => @prefix, :category_id => @category, :page
=> @page}.reject {|k,v| v.nil?}
=> {:prefix=>"asdasdf", :category_id=>"cat"}

Jesus.