generator.rb

# Consistent API so we can change the underpinnings without breakage
# Everything done inside the block will adopt :activerecord as trait
Rails.generator(:model).add(:activerecord) do

  # this will be handled as a binary file
  action 'file.png'

  # as a template
  action 'some_ruby_file.rb'
  
  # as a directory
  action 'some/directory'

  # invoke! is a stupid name, call it what it does instead...
  generate :migration

end