dynamic_operation_methods.rb

module Trailblazer; end

module My; end

class Trailblazer::Operation
  def self.inherited(klass)
    *mod_names, klass_name = klass.name.split('::')
    mod = const_get(mod_names.join('::'))

    mod.define_singleton_method(klass_name) do |*args|
      klass.new.call(*args)
    end
  end
end

class My::Operation < Trailblazer::Operation
  def call(attributes = {})
    puts attributes.inspect
  end
end

My::Operation(first_name: 'foo', last_name: 'bar')