some mongoid cheet-sheet

mongoid.rb

require 'mongoid'

Mongoid.configure do |config|
  name = "db"
  host = "localhost"
  config.master = Mongo::Connection.new.db(name)
  config.slaves = [
    Mongo::Connection.new(host, 27017, :slave_ok => false).db(name)
  ]
  config.persist_in_safe_mode = false
end


class User
  include Mongoid::Document
  include Mongoid::Timestamps
  
  field :name
  
  embeds_one :address
  references_many :posts, :inverse_of => :users
end

class Address
  include Mongoid::Document
  
  field :street
  field :city
  field :state
  field :post_code
  
  embedded_in :user, :inverse_of => :address
end

class Post
  include Mongoid::Document
  
  field :title
  field :content
  
  referenced_in :users
end


#create update and destroy
poor_man = User.create(:name=>'saito')
puts "poor_man.name : "+poor_man.name #=> saito
poor_man.update_attributes(:name=>'Saito')
puts "updated poor_man.name : "+poor_man.name #=> Saito
poor_man.destroy

#complex
user = User.new(:name=>'saito')
post = Post.new(:title=>"hello",:content=>"world")

#embed
user.address = Address.new(:city=>"HZ",:state=>"US")
#association
user.posts << post
#save
user.save
post.save


User.find(:all).each do |user|
  user.posts.each do |post|
    puts "#{user.name}'s post title : " + post.title
    puts "#{user.name}'s post cotent : " + post.content
  end
  puts "#{user.name}'s address city : " + user.address.city
  puts "#{user.name}'s address city : " + user.address.state
end

#destroy also delete association & embed
user.destroy
Post.delete_all
User.delete_all
p "Post count : "+Post.count.to_s
p "User count : "+User.count.to_s