Rails - Nov 2006 - Possible to use attr_reader/writer in model?

I have some properties that I want setable externally, but readable only 
internally. I''ve played around with attr_writer (and attr_reader 
separately) but can''t figure out how to get either to work. I can do 
what I want using attr_accessor, or just straight out defining the prop 
setter method. Anybody know how to use attr_writer or attr_reader with a 
model?

You da man,
Joe

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Hi --

On Sat, 4 Nov 2006, Joe Ruby MUDCRAP-CE wrote:
>
> I have some properties that I want setable externally, but readable only
> internally. I''ve played around with attr_writer (and attr_reader
> separately) but can''t figure out how to get either to work. I can
do
> what I want using attr_accessor, or just straight out defining the prop
> setter method. Anybody know how to use attr_writer or attr_reader with a
> model?
It should work out of the box.  What''s not working?


David

-- 
                   David A. Black |
dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org
Author of "Ruby for Rails"   [1] | Ruby/Rails training &
consultancy [3]
DABlog (DAB''s Weblog)        [2] | Co-director, Ruby Central, Inc.  
[4]
[1] http://www.manning.com/black | [3] http://www.rubypowerandlight.com
[2] http://dablog.rubypal.com    | [4] http://www.rubycentral.org

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Joe Ruby MUDCRAP-CE wrote:
> I have some properties that I want setable externally, but readable only 
> internally. I''ve played around with attr_writer (and attr_reader 
> separately) but can''t figure out how to get either to work. I can
do
> what I want using attr_accessor, or just straight out defining the prop 
> setter method. Anybody know how to use attr_writer or attr_reader with a 
> model?
> 
> You da man,
> Joe
attr_* methods create public methods for accessing instance varables. 
If you dont want the reader method to be puclic, then use attr_writer 
only.

class Foo
  attr_writer :bar

  def bar_is_baz?
    @bar == ''baz''
  end
end

foo = Foo.new
foo.bar = ''snork''
foo.bar           #=> Undefined method
foo.bar_is_baz?   #=> false
foo.bar = ''baz''
foo.bar_is_baz?   #=> true

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