class_collisions

# File railties/lib/rails/generators/base.rb, line 248
        def class_collisions(*class_names) #:nodoc:
          return unless behavior == :invoke

          class_names.flatten.each do |class_name|
            class_name = class_name.to_s
            next if class_name.strip.empty?

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

            # Extract the last Module in the nesting
            last = nesting.inject(Object) do |last_module, nest|
              break unless last_module.const_defined?(nest, false)
              last_module.const_get(nest)
            end

            if last && last.const_defined?(last_name.camelize, false)
              raise Error, "The name '#{class_name}' is either already used in your application " <<
                           "or reserved by Ruby on Rails. Please choose an alternative and run "  <<
                           "this generator again."
            end
          end
        end