From: Sean O'Halpin <sean.ohalpin@...>
Date: 2008-03-09T08:17:46+09:00
Subject: Re: fattr-1.0.2

You might also be interested in doodle (http://doodle.rubyforge.org)
which I've just released.

$ xmpfilter examples/foo.rb
require 'rubygems'
require 'doodle'

class Foo < Doodle::Base
  has :name, :kind => String
end

foo = Foo "Bar"
foo # => #<Foo:0x10a1378 @name="Bar">
baz = Foo 1
# ~> -:10: name must be String - got Fixnum(1) (Doodle::ValidationError)

Regards,
Sean

On Sat, Mar 8, 2008 at 4:18 AM, Daniel Berger <djberg96@gmail.com> wrote:
>
>
>
>  On Mar 7, 9:08 pm, ara howard <ara.t.how...@gmail.com> wrote:
>  > NAME
>  >    fattr.rb
>  >
>  > INSTALL
>  >    gem install fattrs
>  >
>  > URIS
>  >    http://codeforpeople.com/lib/ruby
>  >    http://rubyforge.org/projects/codeforpeople/
>  >    http://codeforpeople.rubyforge.org/svn/
>  >
>  > SYNOPSIS
>  >    fattr.rb is a "fatter attr" for ruby.
>  >
>  >    fattr.rb supercedes attributes.rb as that library, even though it
>  > added only
>  >    one method to the global namespace, collided too frequently with
>  > user code -
>  >    in particular rails' code.
>  >
>  >    the implementation of fattr.rb borrows many of the best ideas from
>  > the
>  >    metakoans.rb ruby quiz
>  >
>  >      http://www.rubyquiz.com/quiz67.html
>  >
>  >    in particular the solutions of Christian Neukirchen and Florian
>  > Gross along
>  >    with concepts from the original traits.rb lib
>  >
>  >    key features provided by fattrs are
>  >
>  >      - ability to specify default values for attrs and definition
>  > time.  values
>  >        can be literal objects or blocks, which are evaluated in the
>  > context of
>  >        self to initialize the variable
>  >
>  >      - classes remember which fattrs they've defined and this
>  > information is
>  >       available to client code
>  >
>  >      - a whole suite of methods is defined by calls to #fattrs including
>  >       getter, setter, query (var?) and banger (var! - which forces
>  >       re-initialization from the default value/block)
>  >
>  >      - ability to define multiple fattrs at once using key => value
>  > pairs
>  >
>  >      - fast lookup of whether or not a class has defined a certain fattr
>  >
>  >      - fattrs can be defined on objects on a per singleton basis
>  >
>  >      - getters acts as setters if an argument is given to them
>  >
>  >      - block caching, calling an fattr with a block sets the instance
>  >        variable to that block
>  >
>  >      - shortcuts for adding class/module level fattrs
>  >
>
>  Interesting. What about data types?
>
>  class C
>    fattr 'a' => Integer
>  end
>
>  c = C.new
>  c.a = 42 # ok
>  c.a = 'hello' # TypeError
>
>  You may have this, but I didn't see it in the samples or readme (but
>  very well may have missed it).
>
>  Regards,
>
>  Dan
>
>