rails: programmable generators on rails

programming_generators.txt

[2] (pry) main: 0> g = Rails::Generators::ScaffoldControllerGenerator.new
ArgumentError: wrong number of arguments (given 0, expected 1+)
from /home/kadu/.asdf/installs/ruby/2.5.3/lib/ruby/gems/2.5.0/gems/railties-4.2.11.1/lib/rails/generators/model_helpers.rb:14:in `initialize'
[3] (pry) main: 0> g = Rails::Generators::ScaffoldControllerGenerator.new('user')
NoMethodError: undefined method `shift' for "user":String
from /home/kadu/.asdf/installs/ruby/2.5.3/lib/ruby/gems/2.5.0/gems/thor-0.19.4/lib/thor/parser/arguments.rb:73:in `shift'
[4] (pry) main: 0> g = Rails::Generators::ScaffoldControllerGenerator.new(['user'])
=> #<Rails::Generators::ScaffoldControllerGenerator:0x000055b1970a8680
 @_initializer=[["user"], {}, {}],
 @_invocations={},
 @after_bundle_callbacks=[],
 @args=[],
 @attributes=[],
 @behavior=:invoke,
 @class_path=[],
 @controller_class_path=[],
 @controller_file_name="users",
 @controller_name="users",
 @destination_stack=["/home/kadu/programming/alfacon/alfaconrails-develop"],
 @file_name="user",
 @in_group=nil,
 @inside_template=nil,
 @name="user",
 @options={"skip_namespace"=>false, "force_plural"=>false, "helper"=>true, "orm"=>false, "template_engine"=>:erb, "test_framework"=>false},
 @shell=
  #<Thor::Shell::Color:0x000055b19700b060 @always_force=false, @base=#<Rails::Generators::ScaffoldControllerGenerator:0x000055b1970a8680 ...>, @mute=false, @padding=0>>