#194 MongoDB and MongoMapper

Dec 28, 2009 | 13 minutes | Plugins, Models

MongoDB is a document based database engine. Learn how to access it through MongoMapper in this episode.

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Note: if you don't want the long MongoDB IDs in the URL, you can set up any attribute as a permalink

          bash
        
rails todo
sudo rake gems:install
script/generate nifty_layout
script/generate nifty_scaffold project name:string --skip-migration
script/generate nifty_scaffold task project_id:string name:string completed:boolean --skip-migration

          config/environment.rb
        
config.gem "mongo_mapper"

          config/initializers/mongo_config.rb
        
MongoMapper.database = "todo-#{Rails.env}"

          models/project.rb
        
class Project
  include MongoMapper::Document
  
  key :name, String, :required => true
  key :priority, Integer
  
  many :tasks
end

          models/task.rb
        
class Task
  include MongoMapper::Document
  
  key :project_id, ObjectId
  key :name, String
  key :completed, Boolean
  
  belongs_to :project
end

          script/console
        
Project.all
Project.all(:order => "name")
Project.all(:priority => 3)
Project.all(:priority.gte => 2)
Project.all(:priority.in => [2, 3])

          projects/_form.html.erb
        
<p>
  <%= f.label :priority %><br />
  <%= f.select :priority, [1,2,3,4,5] %>
</p>

          tasks/_form.html.erb
        
<p>
  <%= f.label :project_id %><br />
  <%= f.collection_select :project_id, Project.all, :id, :name %>
</p>