Data file path in a gem

Rails
1

I am trying to access a data list from inside a gem code, how should I
set the file path …

here is my gem file structure :

my_extension
— my_extension.gemspec
— Gemfile
— Gemfile.lock

lib
my_extension
— code_a.rb
— code_b.rb
— code_c.rb
— my_extension.rb

my_data
— data.yml

from inside code_a.rb, I am trying to load an array from the
data.yml : data = YAML::load(File.open(“data.yml”))
how should I set the path ??

thanks for feedback