mongoid configuration on ruby without framework

Question

I try to write business logic of my application. It is all ruby classes. There is no database or no UI framework like Rails, Sinatra. I only have a Gem_file on business logic and, Gem_file only contain "mini_test" gem. I use mini_test for testing business logic. Now, I need to add a database to the system. How can I do this? mongoid configuration is made in application.file on Rails. But ,I don't use Rails or any other framework. Is there anyway to make configuration of mongoid without framework like Rails, Sinatra. I hope I can explain my problem. Also, I add my codes in below:

this is my context-

class HeadTeacherDefineAcademicYearContext
  attr_reader :person, :academicyear

  def initialize(person, academicyear)
    @person, @academicyear = person, academicyear
    @person.extend HeadTeacher
  end

  def call
   @person.define_academic_year @academicyear
  end
end

this is my role module

module HeadTeacher
  def define_academic_year(academicyear)
     #i write db save process here using any database
  end
end

my model class

class AcademicYear
  attr_accessor :year
end

score 1 · Answer 1 · answered Apr 05 '13 at 11:32

You have to include gem 'mongoid' in your Gemfile and install it. After that, you can require and initialize Mongoid where you need it:

require 'mongoid'
Mongoid.load!("mongoid.yml", :development)

It expects a mongoid.yml file with configuration. Examlpe:

development:
   sessions:
     default:
      database: myapp_development
      hosts:
        - localhost:27017

Of course, you can use another context than :development, maybe assign it via a environment variable. Now, add Mongoid::Document to your model:

class AcademicYear
  include Mongoid::Document

  field :year, type: Integer
end

score 0 · Answer 2 · answered Apr 05 '13 at 11:35

Add gem "mongoid", "~> 3.0.0" to your Gemfile Then put configuration yaml file to your project with contents like this:

development:
  sessions: 
    default:
      database: mongoid
      hosts:
        - localhost:27017

Then use Mongoid.load!("path/to/your/mongoid.yml", :development) in your app.

In every class you want to save objects to DB you have to include Mongoid::Document.

So your example becomes:

class HeadTeacherDefineAcademicYearContext
  attr_reader :person, :academicyear
  field :person, type: String
  field :academicyear, type: Date
  ...
end

You should better check mongoid docs for stuff to do next.

I want to ask one thing about mongoid.yml. Where do I add mongoid.load command? I have no framework, no file about application start. I have only Gemfile and pure Ruby classes. — miyamotomusashi, Apr 08 '13 at 06:02

mongoid configuration on ruby without framework

2 Answers2