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Resourcen:

• MongoDB
• Installing MongoDB on OS X
• MongoMapper
• Why I think Mongo is to Databases what Rails was to Frameworks
• Nifty Generators
• Full episode source code

Quellcode:

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>