Rails core - May 2014 - Adding Model#model_name

Following up on https://github.com/rails/rails/issues/15428, with 
adjustments.

Throughout the Rails code there are a few references to 
`object.class.model_name`. Instead of always pushing this up to the class, 
it makes sense to me that we ask the model for its model_name.

This might obviate the need for the dubious 
ActionController::ModelNaming#model_name_from_record_or_class, 
 https://github.com/rails/rails/blob/master/actionpack/lib/action_controller/model_naming.rb


module ActionController
  module ModelNaming
    # Converts the given object to an ActiveModel compliant one.
    def convert_to_model(object)
      object.respond_to?(:to_model) ? object.to_model : object
    end

    def model_name_from_record_or_class(record_or_class)
      (record_or_class.is_a?(Class) ? record_or_class :
convert_to_model(record_or_class).class).model_name
    end
  end
end


Example:

class Foo
  extend ActiveModel::Naming
  def model_name
    class.model_name
  endend
Foo.respond_to?(:model_name)=> true
Foo.new.respond_to?(:model_name)=> true
Foo.model_name == Foo.new.model_name=> true

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