Adds support for sub-classes to use inherited class name.

[matsimitsu]

Sweet! :+1:

@suweller ?

[mgartner]

This probably only works for immediate parents, not grandparents or beyond, right? For example, the Lion class below would use "Mammal" as the name. Right?

class Animal
  include Mongoid::Autoinc

  increments :tracking_number
end

class Mammal < Animal
  include Mongoid::Autoinc

  increments :tracking_number, use_inherited_class_name: true
end

class Lion < Mammal
  include Mongoid::Autoic

  increments :tracking_number, use_inherited_class_name: true
end

Also I think the name of the option is a little confusing. Maybe something like use_parent_scope.

[krismartin]

Yes, that's correct. It only use the immediate parent model name.

I can change the code slightly to look at the last ancestor that respond to the method 'model_name'. So using your example, the class Lion would use "Animal" as the name. Would you like me to add this?

I'm happy with the option name as you suggested.

[mgartner]

I'm not sure what behavior is better, and ultimately it's not my decision. But whatever is decided I would suggest that the README makes this point clear.

[suweller]

I like the idea of this, but agree with @mgartner that it may not be a very good name. What do you guys think of using_parent_class.

When we add model_name a Mongoid::Document instance responds to the same method as its class, but with entirely different behavior. I'm not sure if this is something we want.

edit: I do like this feature a lot though, don't get me wrong. I just want to think about it a little more ;-)

[johnnyshields]

I've raised an alternate PR #15 which allows :model_name by itself to be specified as an option. I think this is ultimately more flexible as in my case I'm not using subclasses but namespaces (as part of a Rails Engines segmented architecture)

[suweller]

We've decided to go with @johnnyshields version of this feature. I'm sure this pull request has helped all of us to better find the solution best suited for us. Thanks, @krismartin! I'll add you to the list of contributors :-)

[krismartin]

Thank you guys. Good outcome!