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Yesterday I gave a presentation about CouchDB and SimplyStored, our convenience Ruby library, at the Ruby User Group Berlin.

There is a recording of the presentation at ustream.tv.

Mathias and I wrote SimplyStored in order to easily interact with Ruby objects serialized in CouchDB. We use CouchDB as the main data store for Scalarium and so far it has been great. But it is a bit cumbersome to write all those map and reduce functions yourself.

SimplyStored generates the JavaScript map&reduce functions for handling associations or dynamic finders for you.

SimplyStored offers:

• Models
• Associations
• Callbacks
• Validations
• Dynamic finder
• S3 attachments
• Paranoid delete

    class User
      include SimplyStored::Couch

      property :login
      property :age
      property :accepted_terms_of_service, :type => :boolean
      property :last_login, :type => Time
    end

    user = User.new(:login => 'Bert', 
                    :age => 12, 
                    :accepted_terms_of_service => true, 
                    :last_login = Time.now)
    user.save

    User.find_by_age(12).login
    # => 'Bert'

    User.all
    # => [user]

    class Post
      include SimplyStored::Couch

      property :title
      property :body

      belongs_to :user
    end

    class User
      has_many :posts
    end

    post = Post.create(:title => 'My first post', 
                       :body => 'SimplyStored is so nice!', 
                       :user => user)

    user.posts
    # => [post]

    Post.find_all_by_title_and_user_id('My first post', user.id).first.body
    # => 'SimplyStored is so nice!'

    post.destroy

    user.posts(:force_reload => true)
    # => []
  

The code is on github and OpenSource: SimplyStored example code

Another thing I talked about is RockingChair. RockingChair is an in-memory CouchDB implementation that understands all of SimplyStored's functionality. We use it to speed up our tests and be able to run them in parallel.