Getting list of classes in a module?

ruby-talk
1

How do I get the list of all classes that are defined in a module
(from inside a Ruby program)?

My current solution is using ObjectSpace.each_object(Class), which
gets every class defined in the whole program, but then I have to
filter it to get just the classes in a particular module, and this
doesn’t seem like the right way of doing it.

2

Hi,

In mail “Getting list of classes in a module?”

···

Philip Mak pmak@aaanime.net wrote:

How do I get the list of all classes that are defined in a module
(from inside a Ruby program)?

Try this:

def classes_under( mod )
mod.constants.map {|name| mod.const_get(name) }.select {|v| Class === v }
end
classes_under(YourFavoriteModule)

– Minero Aoki

3

Philip Mak wrote:

How do I get the list of all classes that are defined in a module
(from inside a Ruby program)?

My current solution is using ObjectSpace.each_object(Class), which
gets every class defined in the whole program, but then I have to
filter it to get just the classes in a particular module, and this
doesn’t seem like the right way of doing it.

import inspect

···

–
Tokomar

4

Tokomar Reid wrote:

Philip Mak wrote:

How do I get the list of all classes that are defined in a module
(from inside a Ruby program)?

My current solution is using ObjectSpace.each_object(Class), which
gets every class defined in the whole program, but then I have to
filter it to get just the classes in a particular module, and this
doesn’t seem like the right way of doing it.

import inspect

Major apologies. I forgot to check the name of the newsgroup before
posting. That’s Python.

···

–
Tokomar

5

Try this:

def classes_under( mod )
mod.constants.map {|name| mod.const_get(name) }.select {|v| Class === v }
end
classes_under(YourFavoriteModule)

Thanks! I ended up doing this, which is essentially the same but a bit
simpler:

def classes_under(mod)
mod.constants.select{|v| mod.const_get(v).type == Class}
end

6

by the way (only slightly off topic) is there a difference between the
methods Object#type and Object#class ?

···

On Mon, 2002-08-26 at 21:54, Philip Mak wrote:

Try this:

def classes_under( mod )
mod.constants.map {|name| mod.const_get(name) }.select {|v| Class === v }
end
classes_under(YourFavoriteModule)

Thanks! I ended up doing this, which is essentially the same but a bit
simpler:

def classes_under(mod)
mod.constants.select{|v| mod.const_get(v).type == Class}
end

–
~transami

7

Hi,

···

At Tue, 27 Aug 2002 12:54:56 +0900, Philip Mak wrote:

Try this:

def classes_under( mod )
mod.constants.map {|name| mod.const_get(name) }.select {|v| Class === v }
end
classes_under(YourFavoriteModule)

Thanks! I ended up doing this, which is essentially the same but a bit
simpler:

def classes_under(mod)
mod.constants.select{|v| mod.const_get(v).type == Class}
end

Did you want the list of class names, not of classes themselves?

–
Nobu Nakada