今天看看怎么寫自己的Generators
Rails在以下地方查找用戶自定義的Generators:
RAILS_ROOT/lib/generators
RAILS_ROOT/vendor/generators
RAILS_ROOT/vendor/plugins/any_subdirectory/generators
~/.rails/generators
以及以_generator為后綴的Gems
我們看看一個例子代碼:

class TumblepostGenerator < Rails::Generator::NamedBase
  def manifest
    record do |m|
      m.class_collisions class_name
      m.template  "app/controllers/controller_template.rb",
                  "app/controllers/#{file_name}_controller.rb"
      m.template  "app/models/model_template.rb",
                  "app/models/#{file_name}.rb"
      m.directory File.join('app/views', file_name)
      m.template  "app/views/form_template.rhtml",
                  "app/views/#{file_name}/_form.rhtml"
      m.template  "app/views/view_template.rhtml",
                  "app/views/#{file_name}/_view.rhtml"

      m.readme "POST_GENERATION_REMINDER"
    end
  end
end

其中Rails::Generator::NamedBase是ruby script/generator后面帶參數的，而Rails::Generator::Base是不帶參數的
生成的文件會先用ERB解析，這樣我們可以自己構建生成文件的模板，如:

class <%= class_name %>Controller < TumblepostController
  def new
    @thing = <%= class_name %>.new
  end

如果我們要生成數據庫Migration，我們可以這樣寫:

m.migration_template "db/migrations/migration_template.rb", "db/migrate"

事實上已經有很多Generators創建好并以gems部署了，讓我搜索一下:

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