Re: [Rails] Re: run script after initialize

On 6 May 2012 22:13, Guillem Vidal <lists@ruby-forum.com> wrote:

Jeremy Walker wrote in post #1059748:

> On 6 May 2012, at 20:22, Guillem Vidal <lists@ruby-forum.com> wrote:
>

>> ActiveRecord::Base.send(:descendants) and
>> ActiveRecord::Base.send(:subclasses) is allways empty [].
>>
>> I've tried it on config/environment.rb and config/application.rb with no
>> success, can someone tell me what i can do about it?
>>
>
> You could just reopen ActiveRecord::Base. Create a new initializer (a
> ruby file in config/initializers) with:
>
> class ActiveRecord::Base
>   def new_method
>     # do stuff
>   end
> end
>
> Does that help?
> Jeremy Walker
> http://www.ihid.co.uk

Not in my case. What I want to do is define different method names
depending on its relation, for example:

ActiveRecord::Base.send(:descendants).each do |subclass|

       subclass.reflect_on_all_associations.each do |association|
         macro = association.macro #:has_one, :has_many...
         subclass.send(:define_method, "#{association.name}_tokens") do
           read_attribute(__method__[0..-8])
         end
      end
 end

OK, so two more suggestions:

1) Use an after_initialize block in your config (http://guides.rubyonrails.org/configuring.html#rails-general-configuration) to call your method_creation code.

2) Re-open the class (as per my prev suggestion) but write a create_association_tokens method that contains the code to define your reflected methods, and use ActiveRecord::Base's after_initialize method to call that method on an object, thus creating your methods on an object-by-object basis, rather than for the class.

I'm intrigued by the point of all this?

 

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