Rails - Nov 2007 - environment variables unknown in Model with Namespace

Hi,

I have a problem with a model which is defined within a namespace. It
does not seem to find another namespace that was defined in the
environment.

#config/initializers.rb
module X
  class Exception < Exception
    ...some custom exception definitions here...
  end
end

#app/models/y/my_model.rb
class Y::MyModel < ActiveRecord::Base
  validates_presence_of :attr, :message =>
X::Exception.new(''init).to_string_reference
end

This setup fails during boot because the model searches for
Y::MyModel::X, which it cannot find:
"vendor/rails/activerecord/lib/../../activesupport/lib/active_support/
dependencies.rb:478:in `const_missing'':NameError: uninitialized
constant Y::MyModel::X"

When I try the following setup:

#app/models/y/my_model.rb
class Y::MyModel < ActiveRecord::Base
  validates_presence_of :attr, :message
=> ::X::Exception.new(''init).to_string_reference
end

It still fails during boot because it still cannot find X:
"vendor/rails/activerecord/lib/../../activesupport/lib/active_support/
dependencies.rb:266:in `load_missing_constant'':NameError:
uninitialized constant X"

However, in my normal models (without a namespace) it does work:

#app/models/my_other_model.rb
class MyOtherModel < ActiveRecord::Base
  validates_presence_of :attr, :message =>
X::Exception.new(''init).to_string_reference
end

This loads fine. I don''t understand why it does not work in the
namespace situation. Does anybody know what I''m doing wrong?
I''m using
Rails 2.0RC1 by the way.

Thanks in advance,
Bas van Westing


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On Nov 18, 2007, at 3:00 PM, Bas van Westing wrote:
> I have a problem with a model which is defined within a namespace. It
> does not seem to find another namespace that was defined in the
> environment.
>
> #config/initializers.rb
> module X
>  class Exception < Exception
>    ...some custom exception definitions here...
>  end
> end
>
> #app/models/y/my_model.rb
> class Y::MyModel < ActiveRecord::Base
>  validates_presence_of :attr, :message =>
> X::Exception.new(''init).to_string_reference
> end
>
> This setup fails during boot because the model searches for
> Y::MyModel::X, which it cannot find:
> "vendor/rails/activerecord/lib/../../activesupport/lib/active_support/
> dependencies.rb:478:in `const_missing'':NameError: uninitialized
> constant Y::MyModel::X"
>
> When I try the following setup:
>
> #app/models/y/my_model.rb
> class Y::MyModel < ActiveRecord::Base
>  validates_presence_of :attr, :message
> => ::X::Exception.new(''init).to_string_reference
> end
>
> It still fails during boot because it still cannot find X:
> "vendor/rails/activerecord/lib/../../activesupport/lib/active_support/
> dependencies.rb:266:in `load_missing_constant'':NameError:
> uninitialized constant X"
>
> However, in my normal models (without a namespace) it does work:
>
> #app/models/my_other_model.rb
> class MyOtherModel < ActiveRecord::Base
>  validates_presence_of :attr, :message =>
> X::Exception.new(''init).to_string_reference
> end
>
> This loads fine. I don''t understand why it does not work in the
> namespace situation. Does anybody know what I''m doing wrong?
I''m using
> Rails 2.0RC1 by the way.
To give a brief explanation constant autoloading assumes two things  
about a missing constant with qualified name "Foo::Bar":

   1. The definition lives in a file whose filename ends
      with "Foo::Bar".underscore + ''.rb''

   2. The resulting path "foo/bar.rb" exists under one of the
      directories in Dependencies.load_path

When Rails boots Dependencies.load_path is initialized with an array  
of standard directories (like RAILS_ROOT/app/models and friends), but  
since "X" is defined in config/initializers.rb it won''t be
autoloaded
(that file is non-standard AFAIK, are you sure that''s its name?).

-- fxn




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Hi Xavier,

The config/initializer.rb was a typo. It is in config/initializers/
error_codes.rb
The config/initializers/* files are loaded on boot by default with
rails 2.0RC1.

The problem is still unclear to me because the constant is available
in the other model (without the module/namespace). Both models are
loaded in the same boot, so that cannot be the problem. Do you have
any more ideas?

Thanks, Bas


On Nov 18, 4:25 pm, Xavier Noria
<f...-xlncskNFVEJBDgjK7y7TUQ@public.gmane.org>
wrote:
> On Nov 18, 2007, at 3:00 PM,BasvanWestingwrote:
>
>
>
> > I have a problem with a model which is defined within a namespace. It
> > does not seem to find another namespace that was defined in the
> > environment.
>
> > #config/initializers.rb
> > module X
> >  class Exception < Exception
> >    ...some custom exception definitions here...
> >  end
> > end
>
> > #app/models/y/my_model.rb
> > class Y::MyModel < ActiveRecord::Base
> >  validates_presence_of :attr, :message =>
> > X::Exception.new(''init).to_string_reference
> > end
>
> > This setup fails during boot because the model searches for
> > Y::MyModel::X, which it cannot find:
> >
"vendor/rails/activerecord/lib/../../activesupport/lib/active_support/
> > dependencies.rb:478:in `const_missing'':NameError:
uninitialized
> > constant Y::MyModel::X"
>
> > When I try the following setup:
>
> > #app/models/y/my_model.rb
> > class Y::MyModel < ActiveRecord::Base
> >  validates_presence_of :attr, :message
> > => ::X::Exception.new(''init).to_string_reference
> > end
>
> > It still fails during boot because it still cannot find X:
> >
"vendor/rails/activerecord/lib/../../activesupport/lib/active_support/
> > dependencies.rb:266:in `load_missing_constant'':NameError:
> > uninitialized constant X"
>
> > However, in my normal models (without a namespace) it does work:
>
> > #app/models/my_other_model.rb
> > class MyOtherModel < ActiveRecord::Base
> >  validates_presence_of :attr, :message =>
> > X::Exception.new(''init).to_string_reference
> > end
>
> > This loads fine. I don''t understand why it does not work in
the
> > namespace situation. Does anybody know what I''m doing wrong?
I''m using
> > Rails 2.0RC1 by the way.
>
> To give a brief explanation constant autoloading assumes two things
> about a missing constant with qualified name "Foo::Bar":
>
>    1. The definition lives in a file whose filename ends
>       with "Foo::Bar".underscore + ''.rb''
>
>    2. The resulting path "foo/bar.rb" exists under one of the
>       directories in Dependencies.load_path
>
> When Rails boots Dependencies.load_path is initialized with an array
> of standard directories (like RAILS_ROOT/app/models and friends), but
> since "X" is defined in config/initializers.rb it won''t
be autoloaded
> (that file is non-standard AFAIK, are you sure that''s its name?).
>
> -- fxn
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