environment variables unknown in Model with Namespace

rubyonrails-talk
1

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

2

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

3

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