Can't install and use "draper" gem

Question

I have some problems handling draper gem.

1. install draper gem 'draper'

   $ bundle install
   

and this was successful.

2. did rails generate draper:install

   $ rails generate draper:install
   

but I got some errors

    Expected string default value for '--test-framework'; got false (boolean)
    Expected string default value for '--helper'; got true (boolean)
    Expected string default value for '--assets'; got true (boolean)
    Expected string default value for '--test-framework'; got false (boolean)
    Expected string default value for '--helper'; got true (boolean)
    Expected string default value for '--decorator'; got true (boolean)
    Expected string default value for '--decorator'; got true (boolean)
    Expected string default value for '--jbuilder'; got true (boolean)
    Could not find generator draper:install.

3. never mind, I did rails generate decorator Service

   Expected string default value for '--test-framework'; got false (boolean)
   Expected string default value for '--helper'; got true (boolean)
   Expected string default value for '--assets'; got true (boolean)
   Expected string default value for '--test-framework'; got false (boolean)
   Expected string default value for '--helper'; got true (boolean)
   Expected string default value for '--decorator'; got true (boolean)
   Expected string default value for '--decorator'; got true (boolean)
   Expected string default value for '--jbuilder'; got true (boolean)
   Expected string default value for '--test-framework'; got false (boolean)
         create  app/decorators/service_decorator.rb
   

this was successful.

4. made method in services_decorator

   class ServiceDecorator < Draper::Decorator
     delegate_all
   
     def hello
       'hello'
     end
   end
   

5. call this method from view

   <%= Service.first.decorate.hello %>
   

but this was error,

    Could not infer a decorator for ActiveRecord::Base.

Can someone teach me what was wrong and how to solve this problem? The rails version is 4.1.7, and draper version is 2.1.0

Answer 1

To remove errors while using rails generator change gem thor version to 0.19.1

And try to add to application.rb config.autoload.path += %W(#{config.root}/app/decorators)