`rails g scaffold` or `rails g scaffold_controller` never invokes my override of Erb::Generators::ScaffoldGenerator. I can workaround by setting `config.generators.template_engine :all` and moving the override there. That feels wrong.

application.rb

    config.generators do |g|
      g.template_engine :all
      g.fallbacks[:all] = :erb
    end

Erb::scaffold_generator.rb

# lib/generators/erb/scaffold/scaffold_generator.rb

# See http://stackoverflow.com/questions/4696954/how-to-have-the-scaffold-to-generate-another-partial-view-template-file
# require 'rails/generators/erb'
# require 'rails/generators/resource_helpers'
require 'rails/generators/erb/scaffold/scaffold_generator' # see http://stackoverflow.com/questions/16320882/rails-generate-both-html-and-js-views-with-scaffold

module Erb # :nodoc:
  module Generators # :nodoc:
    class ScaffoldGenerator < Erb::Generators::ScaffoldGenerator # :nodoc:
      puts "Source: #{__FILE__}\n"
      # include Rails::Generators::ResourceHelpers
      source_root File.expand_path(File.join('..', 'templates'), __FILE__)

      argument :attributes, type: :array, default: [], banner: "field:type field:type"

      def create_root_folder
        empty_directory File.join("app/views", controller_file_path)
      end

      def copy_view_files
        available_views.each do |view|
          filename = filename_with_extensions(view)
          template filename, File.join("app/views", controller_file_path, filename)
        end
      end

    protected

      def available_views
        %w(index edit show new _form foo)
      end
    end
  end
end

scaffold_controller_generator.rb

# lib/generators/scaffold_controller/scaffold_controller_generator.rb

require 'rails/generators/resource_helpers'
require 'rails/generators/rails/scaffold_controller/scaffold_controller_generator'

module Rails
  module Generators
    class ScaffoldControllerGenerator < NamedBase # :nodoc:
      puts "Source: #{__FILE__}"
      include ResourceHelpers

      check_class_collision suffix: "Controller"

      class_option :orm, banner: "NAME", type: :string, required: true,
                         desc: "ORM to generate the controller for"

      argument :attributes, type: :array, default: [], banner: "field:type field:type"

      def create_controller_files
        template "controller.rb", File.join('app/controllers', class_path, "#{controller_file_name}_controller.rb")
      end

      hook_for :template_engine, :test_framework, as: :scaffold do |invoked|
        # debugger
        # invoke invoked # loads Erb::Generators::ScaffoldGenerator
        invoke 'all:scaffold' # loads my All::Generators::ScaffoldGenerator
      end

      # Invoke the helper using the controller name (pluralized)
      hook_for :helper, as: :scaffold do |invoked|
        invoke invoked, [ controller_name ]
      end
    end
  end
end

scaffold_generator.rb

# lib/generators/scaffold/scaffold_generator.rb

# See https://github.com/rails/rails/blob/4-0-stable/railties/lib/rails/generators/rails/scaffold/scaffold_generator.rb
# Called on `rails g scaffold`
require 'rails/generators/rails/resource/resource_generator'

module Rails
  module Generators
    class ScaffoldGenerator < ResourceGenerator # :nodoc:
      puts "HIT #{__FILE__}"
      remove_hook_for :resource_controller
      remove_class_option :actions

      class_option :stylesheets, type: :boolean, desc: "Generate Stylesheets"
      class_option :stylesheet_engine, desc: "Engine for Stylesheets"
      class_option :assets, type: :boolean
      class_option :resource_route, type: :boolean

      def handle_skip
        @options = @options.merge(stylesheets: false) unless options[:assets]
        @options = @options.merge(stylesheet_engine: false) unless options[:stylesheets]
      end

      hook_for :scaffold_controller, required: true do |invoked|
        # invoke invoked
        invoke :scaffold_controller
      end

      hook_for :assets do |assets|
        invoke assets, [controller_name]
      end

      hook_for :stylesheet_engine do |stylesheet_engine|
        if behavior == :invoke
          invoke stylesheet_engine, [controller_name]
        end
      end
    end
  end
end