Rails - Apr 2009 - [ActiveRecord] strange issue, would like to understand before I wake up...

running 2.3.2

simple case   (db table created :  ''emails''  with a :type
field)

I have the following Email model

class Email < ActiveRecord::Base
....
end

class RequestEmail < Email
....
end

TESTING in the console :
script/console
Loading development environment (Rails 2.3.2)
>> Email.new
=> #<Email id: nil, sender_email: nil, subject: nil, content: nil,
user_id: nil, created_at: nil, updated_at: nil, title: "mr",
firstname: "", lastname: "Anonymous", type: nil>    (Note
: type is
nil, not "Email" ... ?)
>> RequestEmail.new
=> #<RequestEmail id: nil, sender_email: nil, subject: nil, content:
nil, user_id: nil, created_at: nil, updated_at: nil, title: "mr",
firstname: "", lastname: "Anonymous", type:
"RequestEmail">
>> exit
now TESTING again..
script/console
Loading development environment (Rails 2.3.2)
>> RequestEmail.new
NameError: uninitialized constant RequestEmail
...const_missing

I''ll appreciate some feedback , should I buy a 2nd glass ?  LOL

thanks

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found a trcik , but I don''t understand why ....

In my ApplicationController
require_dependency ''email''

On 8 avr, 14:11, Erwin <yves_duf...-ee4meeAH724@public.gmane.org>
wrote:
> running 2.3.2
>
> simple case   (db table created :  ''emails''  with a :type
field)
>
> I have the following Email model
>
> class Email < ActiveRecord::Base
> ....
> end
>
> class RequestEmail < Email
> ....
> end
>
> TESTING in the console :
> script/console
> Loading development environment (Rails 2.3.2)>> Email.new
>
> => #<Email id: nil, sender_email: nil, subject: nil, content: nil,
> user_id: nil, created_at: nil, updated_at: nil, title: "mr",
> firstname: "", lastname: "Anonymous", type: nil>  
 (Note : type is
> nil, not "Email" ... ?)>> RequestEmail.new
>
> => #<RequestEmail id: nil, sender_email: nil, subject: nil, content:
> nil, user_id: nil, created_at: nil, updated_at: nil, title: "mr",
> firstname: "", lastname: "Anonymous", type:
"RequestEmail">
>
> >> exit
>
> now TESTING again..
> script/console
> Loading development environment (Rails 2.3.2)>> RequestEmail.new
>
> NameError: uninitialized constant RequestEmail
> ...const_missing
>
> I''ll appreciate some feedback , should I buy a 2nd glass ?  LOL
>
> thanks
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On 8 Apr 2009, at 13:11, Erwin wrote:
>
> TESTING in the console :
> script/console
> Loading development environment (Rails 2.3.2)
>>> Email.new
> => #<Email id: nil, sender_email: nil, subject: nil, content: nil,
> user_id: nil, created_at: nil, updated_at: nil, title: "mr",
> firstname: "", lastname: "Anonymous", type: nil>   
(Note : type is
> nil, not "Email" ... ?)
>>> RequestEmail.new
> => #<RequestEmail id: nil, sender_email: nil, subject: nil, content:
> nil, user_id: nil, created_at: nil, updated_at: nil, title: "mr",
> firstname: "", lastname: "Anonymous", type:
"RequestEmail">
>>> exit
>
> now TESTING again..
> script/console
> Loading development environment (Rails 2.3.2)
>>> RequestEmail.new
> NameError: uninitialized constant RequestEmail
> ...const_missing
>
> I''ll appreciate some feedback , should I buy a 2nd glass ?  LOL
>
If you try an eval a constant that does not exist const_missing is  
called (which by default raises NameError)
Rails implements a const_missing that tries to load the file  
containing the constant for you. Rails can''t guess where
you''ve put
your models, so this only works if you stick to the conventions:  
email.rb contains Email, FooController is in foo_controller.rb etc.

If you use Email before RequestEmail then email.rb is loaded (which  
defines both those classes) because Rails knows to load email.rb is  
const_missing triggers on Email. WHen you do things the other way  
round rails does not know what to do with RequestEmail since there is  
no request_email.rb. require_dependency works because it loads email.rb

Fred
> thanks
>
> >

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