Initialize a subclass inside a namespace

ruby-talk
1

I have a namespace Foo and a class Bas and a class Bar. I am adding
classes Bas & Bar are both inside the namespace Foo.

module Foo
  class Bas
  .
  end

  class Bar
  .
  end
end

I have some dynamically added classes that are subclasses of Bar, but I
want them to be in a namespace under Foo::Bas e.g. Foo::Bas::ThisClass
& Foo::Bar::ThatClass

class this < Bar
.
end

I put them into the namespace Foo::Bas as follows;

module Foo
  class Bas
    def self.load_stuff
       module_eval File.read(file_name_where_this_class_is_defined)
    end
  end
end

This all works, but I would like to include some code that runs in the
context of ThisClass but before the contents of
file_name_where_this_class_is_defined, but the catch is I cannot assume
the names of the classes being loaded from the file, therefore I am
looking for a callback that is run in context of ThisClass as soon as
ThisClass is defined.

Any ideas?

Thanks,
James

2

I have a namespace Foo and a class Bas and a class Bar. I am adding
classes Bas & Bar are both inside the namespace Foo.

module Foo
  class Bas
  .
  end

  class Bar
  .
  end
end

I have some dynamically added classes that are subclasses of Bar, but I
want them to be in a namespace under Foo::Bas e.g. Foo::Bas::ThisClass
& Foo::Bar::ThatClass

...

This all works, but I would like to include some code that runs in the
context of ThisClass but before the contents of
file_name_where_this_class_is_defined, but the catch is I cannot assume
the names of the classes being loaded from the file, therefore I am
looking for a callback that is run in context of ThisClass as soon as
ThisClass is defined.

I don't see a callback when a class (or any constant for that matter)
is added to a module.

On the other hand, can you do what you want by overriding
Foo::Bar.inherited ? At least you can tell when a subclass has been
created.

···

On 10/14/06, J2M <james2mccarthy@gmail.com> wrote:

--
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/

3

Good idea Dave, I will give that a go.

Thanks,
James

···

On Oct 15, 2:49 am, "Rick DeNatale" <rick.denat...@gmail.com> wrote:

On 10/14/06, J2M <james2mccar...@gmail.com> wrote:

> I have a namespace Foo and a class Bas and a class Bar. I am adding
> classes Bas & Bar are both inside the namespace Foo.

> module Foo
> class Bas
> .
> end

> class Bar
> .
> end
> end

> I have some dynamically added classes that are subclasses of Bar, but I
> want them to be in a namespace under Foo::Bas e.g. Foo::Bas::ThisClass
> & Foo::Bar::ThatClass...

> This all works, but I would like to include some code that runs in the
> context of ThisClass but before the contents of
> file_name_where_this_class_is_defined, but the catch is I cannot assume
> the names of the classes being loaded from the file, therefore I am
> looking for a callback that is run in context of ThisClass as soon as
> ThisClass is defined.I don't see a callback when a class (or any constant for that matter)
is added to a module.

On the other hand, can you do what you want by overriding
Foo::Bar.inherited ? At least you can tell when a subclass has been
created.

--
Rick DeNatale

My blog on Rubyhttp://talklikeaduck.denhaven2.com/

4

Whoops replied to the wrong message!

Thanks Rick, that worked perfectly.

James

···

On Oct 15, 2:56 am, "J2M" <james2mccar...@gmail.com> wrote:

Good idea Dave, I will give that a go.

Thanks,
James

On Oct 15, 2:49 am, "Rick DeNatale" <rick.denat...@gmail.com> wrote:

> On 10/14/06, J2M <james2mccar...@gmail.com> wrote:

> > I have a namespace Foo and a class Bas and a class Bar. I am adding
> > classes Bas & Bar are both inside the namespace Foo.

> > module Foo
> > class Bas
> > .
> > end

> > class Bar
> > .
> > end
> > end

> > I have some dynamically added classes that are subclasses of Bar, but I
> > want them to be in a namespace under Foo::Bas e.g. Foo::Bas::ThisClass
> > & Foo::Bar::ThatClass...

> > This all works, but I would like to include some code that runs in the
> > context of ThisClass but before the contents of
> > file_name_where_this_class_is_defined, but the catch is I cannot assume
> > the names of the classes being loaded from the file, therefore I am
> > looking for a callback that is run in context of ThisClass as soon as
> > ThisClass is defined.I don't see a callback when a class (or any constant for that matter)
> is added to a module.

> On the other hand, can you do what you want by overriding
> Foo::Bar.inherited ? At least you can tell when a subclass has been
> created.

> --
> Rick DeNatale

> My blog on Rubyhttp://talklikeaduck.denhaven2.com/