From: "David A. Black" <dblack@...>
Date: 2008-04-30T21:59:27+09:00
Subject: Re: How to create "def method(item)= (value)" ?

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Hi --

On Wed, 30 Apr 2008, Phillip Gawlowski wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> I=C3=B1aki Baz Castillo wrote:
> | Hi, is it not possible to create a method to use in this way?
> |
> |    my_object.param("tag") =3D "new_value"
> |
> | How to define that method? I've tryed something as:
> |
> |   def param(name)=3D (value)
> |     @params[name] =3D value
> |   end
> |
> | but obviously I get error:
> |
> |   SyntaxError: compile error
> |   syntax error, unexpected '=3D'
> |
> | Is there some way? Thanks a lot.
> |
>
> Untested, and probably highly inelegant:
>
> def param key, value
> ~  @params["#{key.to_sym}"] =3D value
> end
>
> Should produce:
>
> | object.params my_key, 'my value'
> =3D> @params[:my_key] =3D> 'my value'

"#{key.to_sym}" is always going to produce a string, never a symbol.
I'm not sure the OP wants to constrain the keys to be symbols anyway.
Also, you're calling params; I think you mean param.

So:

   def param(key,value)
     @params[key] =3D value
   end

   object.param(my_key, "my_value")

Also untested, due to laziness :-)

You could also do:

   def param[]=3D(key,value)
     @params[key] =3D value
   end

   object.param[key] =3D value

Of course, then one might as well do:

   attr_reader :params

on the object, and them:

   object.params[key] =3D value


David

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