From: Robert Klemme <shortcutter@...>
Date: 2011-04-12T15:53:56+09:00
Subject: Re: Copying parameters to singleton class

On Tue, Apr 12, 2011 at 4:05 AM, 7stud -- <bbxx789_05ss@yahoo.com> wrote:
> Robert K. wrote in post #992088:
>>
>> Choose to your liking. :-)
>>
>
> Hey Robert K,
>
> I read your factory pattern thread the other day, and I wonder if that
> pattern would apply here?  After all, producing several anonymous
> instances of Class is akin to producing instances of various classes.
> Something like this:
>
> class ClassFactory
>  def self.using(hash)
>    Class.new do
>     @options = hash
>
>       class << self
>         attr_reader :options
>       end
>
>     end
>  end
> end

Well, basically you just exchanged Opportunities with ClassFactory
compared to one of my examples.  Actually method #using *is* a factory
method, no matter what class or instance it sits in.

> foo = Opportunities.using({one: 1, two: 2, three: 3})
> bar = Opportunities.using({four: 4, five: 5, six: 6})

I don't think this can work - at least there's something missing.  Did
you mean to make Opportunities inherit ClassFactory?  But IMHO there
is no point in splitting this up.  Please note also that I made new
classes inherit Opportunities in order for inheritance to work.

> p foo.options
> p bar.options
>
> --output:--
> {:one=>1, :two=>2, :three=>3}
> {:four=>4, :five=>5, :six=>6}
>
>
> Hey Lars Olsson,
>
> Check out the shorter syntax for hashes when your keys are symbols.
>
> foo = Opportunities.using({one: 1, two: 2, three: 3})
> bar = Opportunities.using({four: 4, five: 5, six: 6})

If we start shortening it, we should do

foo = Opportunities.using(one: 1, two: 2, three: 3)

i.e. get rid of the superfluous pair of curly braces. :-)

Kind regards

robert

-- 
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