On Nov 16, 2007 9:31 PM, Michael Linfield <globyy3000 / hotmail.com> wrote:
> if i wanted to ARGV this, how would i do it?
> IE from the command line i would want to do as such ---
> ./script.rb User.join_group("Group_1")
>
> Any ideas?

One way is to use eval. Other way is to define special commands
(--join_group=Group_1).
On windows I had to enclose the argument in single quotes to preserve
the double ones.

# dummy implementation
class PGconn
  def self.connect(*args); return new end
  def exec(*args) ; p args ; end
end

class User
  @@client = 'client' # dummy

  GROUPS = %w{ Group_1 Group_2 Group_3 }

  class << self
    def join_group(newgroup)
      # 1. ||= -> connect only once
      # if you need @@base only in singleton (class) methods, just use
@base - singleton instance variable
      # this will not be inherited to derived classes though.
      @base ||= PGconn.connect("localhost",5432,"","","base","god","letmein")
      case newgroup
      when *GROUPS # this is equivalent to: when "Group_1", "Group_2", "Group_3"
        @base.exec("insert into #{newgroup.upcase}(members) values
('#{@@client}')")
      else
        puts "Error: Non-Existant Group. Check Spelling."
      end
    end
  end
end

# ./script.rb 'User.join_group("Group_1")'
eval(ARGV[0])