Zeng -- a data mapper tool for nosql database

Main features

• Install

sudo gem install zeng

• Independent Object Storage

Through backend_configure to appoint storage location

    class User
       include Zeng::Document
       backend_configure :TT,"127.0.0.1:1987"
    end

• Customize define persistent properties

You can assign persitent properties by assign method,and set default value for each property.

    class User
       include Zeng::Document
       backend_configure :TT,"127.0.0.1:1987"
       assign :name, :email, :gender=>'male', :age=>25
    end

Index

    class User
      include Zeng::Document
      backend_configure :TT,"127.0.0.1:1987"
      assign :name,:email, :gender=>'male', :age=>25
    end

    @jim = User.create(:name=>"jim", :email=>"jim@nonobo.com")
    @aaron = User.create(:name=>"aaron", :email=>"aaron@nonobo.com")
    @jack= User.create(:name=>"jack", :email=>"jack@nonbo.com")
    @lucy = User.create(:name=>"lucy", :email=>"lucy@nonobo.com")

Using Zeng::Indexer module, you can build index for object, just like:

    Zeng::Indexer::map(User=>[:name, :email, :age])

then,

    User.indexes << @jim
    User.indexes << @aaron
    User.indexes << @lucy
    User.find_all_by_name("jim")     #=>@jim
    User.find_all_by_age(25)         #=>@jim, @aaron, @lucy, @jack

Supoort multiple database

Zeng using adapter to connect database backend, now support TokyoCabinet/TokyoTyrant。

Using in rails

in environment.rb, you will add

   require 'zeng