Rails - Dec 2008 - Best way to automatically format model entries

Using rails 2.1.0 I have a really nasty bit of code in my controller in
my create action that i would like to move to my model:

params[:phrase]["word"] =
params[:phrase]["word"].strip.squeeze(" ")
        if params[:phrase]["word"] != nil

params[:phrase]["second_word"]
params[:phrase]["second_word"].strip.squeeze(" ")      if
params[:phrase]["second_word"] != nil

params[:phrase]["third_word"]
params[:phrase]["third_word"].strip.squeeze(" ")       if
params[:phrase]["third_word"] != nil

@phrase = Phrase.new(params[:phrase])


What would be the best way to do this, I was thinking of putting it
inside of a :before_save function. But i''ve never written one before
and
didn''t know how to get the parameters from my recently saved phrase(
how
do I tell it to use the phrase i just created? @phrase.word ? ). What
would you recommend??
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Richard Schneeman wrote:
> Using rails 2.1.0 I have a really nasty bit of code in my controller in
> my create action that i would like to move to my model:
> 
> params[:phrase]["word"] =
params[:phrase]["word"].strip.squeeze(" ")
>         if params[:phrase]["word"] != nil
> 
> params[:phrase]["second_word"] >
params[:phrase]["second_word"].strip.squeeze(" ")      if
> params[:phrase]["second_word"] != nil
> 
> params[:phrase]["third_word"] >
params[:phrase]["third_word"].strip.squeeze(" ")       if
> params[:phrase]["third_word"] != nil
> 
> @phrase = Phrase.new(params[:phrase])
> 
> 
> What would be the best way to do this, I was thinking of putting it
> inside of a :before_save function. But i''ve never written one
before and
> didn''t know how to get the parameters from my recently saved
phrase( how
> do I tell it to use the phrase i just created? @phrase.word ? ). What
> would you recommend??
Put something like this in a file in the lib directory:

class ActiveRecord::Base
   def self.blacken_attrs(*attrs)
     before_validation <<-END
       #{attrs.inspect}.each do |attr|
         if v = send(attr)
           v.strip!
           v.squeeze!('' '')
         end
       end
     END
   end
end

Then in the Phrase model write

blacken_attrs :word, :second_word, :third_word

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