From: "ara.t.howard" <ara.t.howard@...>
Date: 2008-03-02T01:47:23+09:00
Subject: Re: Ara's main gem: validation with error message

On Fri, Feb 29, 2008 at 9:53 PM, Peña, Botp <botp@delmonte-phil.com> wrote:
> Hi,
>
>  This request should probably be addressed directly to Ara but maybe others may have other ideas, so
>
>  Using Ara's main, I have something like the following,
>
>  Main do
>   argument :user do
>     required
>     description "name or userid"
>     validate{|user| check1(user)}
>     validate{|user| check2(user,child)}
>     validate{|user| check3(user,parent)}
>   end
>
>   def run
>     p params[:user].value
>   end
>  end
>
>
>  Currently, i only get one validation message like,
>
>     invalid: argument(user)="botp"
>
>
>  It would be nice if i could specify/add an (optional) error message for each validation, like eg
>
>
>     validate("user does not exist"){|user| check1(user)}
>     validate("user must have child"){|user| check2(user,child)}
>     validate("user need parent"){|user| check3(user,parent)}
>
>
>  Are you there, Ara? ;-)
>
>  Sorry for your time, Ara, as i'm fond of your main gem.
>  Thank you for main.
>
>  kind regards -botp
>
>

one idea:


cfp2:~ > cat a.rb
require 'main'

Main do
  argument(:user) do
    required
    description 'name or userid'

    message = 'YOU CAN USE A CLOSURE'

    validate do |user|
      if user == 'foo'
        message = 'message one'
        return false
      end

      if user == 'bar'
        message = 'message two'
        return false
      end

      true
    end

    error{ STDERR.puts message }
  end

  def run
    p param[:user].value
  end
end


cfp2:~ > ruby a.rb foo
message one


cfp2:~ > ruby a.rb bar
message two


cfp2:~ > ruby a.rb foobar
"foobar"
-- 
-a
--
be kind whenever possible... it is always possible - h.h. the 14th dalai lama