Rails - Dec 2009 - Understanding where certain 'inherited' methods come from in ActionController::Base

Hi I just started getting my hands on Rails, I''ve been reading a good
book on the subject but now I want to continue by myself and with the
help of the rails api documentation but I find it quite difficult to
follow (copared with the Java generated docs for example).

One thing that I still can''t get to understand is how methods like
''layout'' become available on my controllers to mention one
example I
supposed that the method was defined inside ActionController::Base but
reading the docs I see there is no such thing defined there.

Can you please clarify on this issue, I believe it may be something
related to the Ruby that I still don''t know about.

Thanks in advance.
M.

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On Wed, Dec 16, 2009 at 11:06 PM, Manuca
<manuca-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi I just started getting my hands on Rails, I''ve been reading a
good
> book on the subject but now I want to continue by myself and with the
> help of the rails api documentation but I find it quite difficult to
> follow (copared with the Java generated docs for example).
>
> One thing that I still can''t get to understand is how methods like
> ''layout'' become available on my controllers to mention
one example I
> supposed that the method was defined inside ActionController::Base but
> reading the docs I see there is no such thing defined there.
>
> Can you please clarify on this issue, I believe it may be something
> related to the Ruby that I still don''t know about.
Try apidock.com.

http://apidock.com/rails/ActionController

Hope it helps.

-- 
Leonardo Mateo.
There''s no place like ~

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On Dec 17, 9:31 am, Leonardo Mateo
<leonardoma...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Try apidock.com.
> http://apidock.com/rails/ActionController
> Hope it helps.
>
Ok thanks for the info, those docs seem more friendly, anyway, I still
don''t understand where those methods (for ex. layout) get inherited or
injected don''t know how that magic happens they aren''t
mentioned even
in apidock.com.

Thanks
m.

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On Thu, Dec 17, 2009 at 11:59 AM, Manuca
<manuca-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Ok thanks for the info, those docs seem more friendly, anyway, I still
> don''t understand where those methods (for ex. layout) get
inherited or
> injected don''t know how that magic happens
when in doubt, cd to one of your projects and e.g.
  find vendor/rails  -type f -exec grep -H ''def layout'' {} \;

You''ll see exactly how the magic happens :-)  (and in this case, also
lots o'' comments).

HTH,
-- 
Hassan Schroeder ------------------------
hassan.schroeder-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
twitter: @hassan

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On Dec 17, 5:13 pm, Hassan Schroeder
<hassan.schroe...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> when in doubt, cd to one of your projects and e.g.
>   find vendor/rails  -type f -exec grep -H ''def layout''
{} \;
Thanks again for the feedback, yep I already did a recursive grep
inside my gems dirs and found those definitions I guess there i''ll
find the real info, anyway what I find confusing is that in the docs
those automatic inclusions are not mentioned, maybe those are obvious
or implicit and they can be derived from the module name I really
don''t know because Im also new to the Ruby language.

Is it possible that because both ActionController::Base and
ActionController::Layout::ClassMethods share th
''ActionController''
module they are inside the same namespace and all public methods of
Layout are available to Base? Can I conclude that this is the case
with all clases inside ActionController?

Please excuse my enormouse ignorance on the subject
Thanks for you patience!
m.

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It might be easier to understand what''s going on in Rails master. Take
a look at
http://github.com/rails/rails/blob/master/actionpack/lib/action_controller/base.rb#L5-37.
As you can see, the Base class is including a series of modules. In
Ruby, modules are like dynamic superclasses; including one adds the
module to the superclass chain.

For instance, observe that ActionController::Base includes
ActionController::UrlFor. You can follow that module to
http://github.com/rails/rails/blob/master/actionpack/lib/action_controller/metal/url_for.rb,
which has the much-used url_for method (http://github.com/rails/rails/
blob/master/actionpack/lib/action_controller/metal/url_for.rb#L28-39).

Hope this helps.

-- Yehuda

On Dec 17, 12:48 pm, Manuca
<man...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On Dec 17, 5:13 pm, Hassan Schroeder
<hassan.schroe...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>
> > when in doubt, cd to one of your projects and e.g.
> >   find vendor/rails  -type f -exec grep -H ''def
layout'' {} \;
>
> Thanks again for the feedback, yep I already did a recursive grep
> inside my gems dirs and found those definitions I guess there i''ll
> find the real info, anyway what I find confusing is that in the docs
> those automatic inclusions are not mentioned, maybe those are obvious
> or implicit and they can be derived from the module name I really
> don''t know because Im also new to the Ruby language.
>
> Is it possible that because both ActionController::Base and
> ActionController::Layout::ClassMethods share th
''ActionController''
> module they are inside the same namespace and all public methods of
> Layout are available to Base? Can I conclude that this is the case
> with all clases inside ActionController?
>
> Please excuse my enormouse ignorance on the subject
> Thanks for you patience!
> m.
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On Dec 17, 6:21 pm, Yehuda Katz
<wyc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hope this helps.
Thanks Yehuda that was of help.
m.

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