Rails - Jan 2007 - where to define global functions and classes?

Where or how should I define functions and classes to be globally
available to my entire Rails application?  When I use script/generate
to make a new model, it is available to to entire app... what if I want
to make a simple class or global func to be available to the entire
app?  Is there a specific Rails way to do it?

Thanks.


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(answer from beginner)

But if you ask me you should put it in the /app/application.rb to make
it available to all.


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> what if I want
> to make a simple class or global func to be available to the entire
> app?  Is there a specific Rails way to do it?
It depends on where you need to use this code.

If it''s a view method, helpers/application_helper.rb is the place.

If you have a class that is used by other code then you need to put
that into lib/.  For example, if you had a class that encrypts data,
you might create a class called ''Encryptor'' and put it in
lib/encryptor.rb.  If you''re using <Rails 1.2, then you need to add
an
include to config/environment.rb to pull that class in.  As of Rails
1.2, this is done for you when the class is called.

If you have a method that is used by all controllers, then you *can*
put it in application_controller.rb, but you should think about whether
it belongs there or should really be in a helper or separate utility
class.

Hope that helps,

Steve


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Steve,
Thanks for the reply, that answered my question as well as some others.
 Let me see if I got it straight though....

*  Putting methods in module ApplicationHelper found in
helpers/application_helper.rb will only be available to views (but not
controllers or models)?
*  files created in /lib will automatically be included in Rails 1.2
and must be manually included in config/environment.rb in Rails < 1.2?
*  Putting methods in class ApplicationController found in
controllers/application.rb will be available to all controllers (but
not views or models)?

Does it sound like I got it?

Thanks,
-- C

Steve Bartholomew wrote:
> > what if I want
> > to make a simple class or global func to be available to the entire
> > app?  Is there a specific Rails way to do it?
> It depends on where you need to use this code.
>
> If it''s a view method, helpers/application_helper.rb is the place.
>
> If you have a class that is used by other code then you need to put
> that into lib/.  For example, if you had a class that encrypts data,
> you might create a class called ''Encryptor'' and put it in
> lib/encryptor.rb.  If you''re using <Rails 1.2, then you need to
add an
> include to config/environment.rb to pull that class in.  As of Rails
> 1.2, this is done for you when the class is called.
>
> If you have a method that is used by all controllers, then you *can*
> put it in application_controller.rb, but you should think about whether
> it belongs there or should really be in a helper or separate utility
> class.
> 
> Hope that helps,
> 
> Steve

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(from another beginner)

I had a similar question earlier and the answer was to store methods 
callable from views in app\helpers\application_helper.rb and to store 
methods that can be called from controllers in 
lib\whatever_you_want_to_call_it.rb.

Shauna

-- 
Posted via http://www.ruby-forum.com/.

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