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A simple Ruby gem to create a service class and attending test file for your Rails application
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Code Climate Gem Version

A gem for Rails that adds a generator for easily creating a service class and/or form object and its accompanying spec or test unit file.


Rails 4 and higher


Add this line to your application's Gemfile:

gem 'rails_services'

And then execute:

$ bundle

Or install it yourself as:

$ gem install rails_services



$ [bundle exec] rails generate rails_services:create Service ParentFolder --sub_folder SubFolder [opt]

$ [bundle exec] rails generate rails_services:destroy Service ParentFolder --sub_folder SubFolder [opt]

$ [bundle exec] rails generate rails_services:form Form ParentFolder --sub_folder SubFolder [opt] --accessors name email [opt]



There are four primary changes in v3.0.0:

  1. All services have include BaseService
  2. The call method is an instance method rather than a class method
  3. You may generate a Form model
  4. An updated command line interface (see below)

Updated command line interface

Previous versions of the gem used plain old arguments to create or destroy the appropriate files. Over time, this became more unwieldy than imagined. From v3.0.0 forward, there are only two arguments: object_name and parent_name. Additionally, the previously available optional argument, instance, was removed (see REMOVALS section, below).

If you would like to add a sub-folder to the service or form, you can now provide the class_option for it: --sub_folder NAME_OF_FOLDER. Similarly, for the form generator, you can pass in an array of attr_accessors with the following: --accessors accessor_1_name accessor_2_name ... (use regular strings as these will be 'converted' to symbols).


There was one significant removal from the gem:

  1. No more instance argument in the command line interface (see below)

Instance argument dropped

An instance argument was added in v2.0.0 which allowed users to choose what style of service class to create. The gem defaulted to using this new style.

While the v2.x line continued to allow users a choice between the old and new^ styles, the v3.x line removes this choice. All services will be created with the now-not-so-new style. BE AWARE :)!

^The new style creates service clases inherited from a BaseService class; allows for optional instantiation of the service (*).call), and uses an instance method for call.


Upgrading to current service class style

Should you want to update your older/previously built services with this 'new' style, you only need to do the following:

 # include the base service in your class
 class ClassName
   include BaseService

 # Then ... optionally, add an initialize method 
 def initialize(*args)
   # ... 
 # Finally, change the method signatures, simply removing `self.` from the definition(s), as follows: 
   # ...
 # becomes
 def call
   # ...
 # and so on for other, similarly defined methods


Sub-folders are optional but, at this time, you may only use one sub-folder. I generally only use the sub-folders when I have a naturally grouped set of services.

Generator results

Create service and create form

Two files are created: the requested class and either a spec or test class, based on your testing framework (minitest or rspec).

For services:

  • app/services/[parent-folder]/[sub-folder]/thing.rb
  • spec/services/[parent-folder]/[sub-folder]/thing_spec.rb OR
  • test/services/[parent-folder]/[sub-folder]/thing_test.rb

For forms:

  • app/forms/[parent-folder]/[sub-folder]/thing_form.rb
  • spec/forms/[parent-folder]/[sub-folder]/thing_form_spec.rb OR
  • test/forms/[parent-folder]/[sub-folder]/thing_form_test.rb

Destroy service

Pretty simple here ... it just removes the files it created!


  1. Fork it ( )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request
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