ruby - Rails Railtie initializer does not run -

i'm developing gem use in rails 4 application include bit of code run initializer host application. adding class module const_set, code isn't ever being run. also, when put gem in app's gemfile , start either rails console or server, classes expect defined gem not. if plain require 'my_gem' console, classes expect defined defined, , if run initialization code manually, no errors thrown. know must missing trivial, can't figure out is.

here mygem/lib/mygem.rb:

require "mygem/railtie" if defined?(rails) require "mygem/version"  module mygem   class myclass      def self.my_method(argument1, argument2, argument3)       argument1 == argument2 + argument3     end   end end 

here mygem/lib/mygem/railtie.rb:

module mygem   class railtie < rails::railtie      initializer "mygem.define_subclass"       previouslydefinedappmodule.const_set "myclass", mygem::myclass     end   end end 

after putting gem in app's gemfile , start console, mygem module defined, mygem::myclass not defined, however. also, far can tell, no initializer code gem ever run (it fail since class wasn't defined). when require 'mygem', mygem::myclass defined. i've taken @ number of rails plugins , railtie tutorials , add gem gemfile , should work. can spot i'm doing wrong?

i've figured out after posted. gem name my-gem, module's file name my_gem.rb. in host app's gemfile have line gem my-gem, load gem need require 'my_gem'. so, in order fix this, need replace line in host app's gemfile gem my-gem, require: "my_gem" (or fix confusing , haphazard naming scheme :).