instance method class_collisions

# File railties/lib/rails_generator/commands.rb, line 171
        def class_collisions(*class_names)
          path = class_names.shift
          class_names.flatten.each do |class_name|
            # Convert to string to allow symbol arguments.
            class_name = class_name.to_s

            # Skip empty strings.
            next if class_name.strip.empty?

            # Split the class from its module nesting.
            nesting = class_name.split('::')
            name = nesting.pop

            # Extract the last Module in the nesting.
            last = nesting.inject(Object) { |last, nest|
              break unless last.const_defined?(nest)
              last.const_get(nest)
            }

            # If the last Module exists, check whether the given
            # class exists and raise a collision if so.
            if last and last.const_defined?(name.camelize)
              raise_class_collision(class_name)
            end
          end
        end