tjackiw

$ gem install 'neo4j'

tjackiw

gem 'neo4j'

tjackiw

me   = User.first
andy = User.last
me.all_friends_to(andy)
=> "Me => Bob => Mark => Mary => John => Andy"

tjackiw

  def all_friends_to(user)
    neo_node.all_simple_paths_to(user.neo_node).incoming(:friends).depth(5).nodes.each do |node|
      puts node.map{|n| n.name }.join(' => ')
    end
  end

tjackiw

Friendship.create_both(me, bob)
Friendship.create_both(bob, mark)
Friendship.create_both(mark, mary)
Friendship.create_both(mary, john)
Friendship.create_both(john, andy)

tjackiw

me   = User.create(name: 'Me',   age: 31)
bob  = User.create(name: 'Bob',  age: 29)
mark = User.create(name: 'Mark', age: 34)
mary = User.create(name: 'Mary', age: 32)
john = User.create(name: 'John', age: 33)
andy = User.create(name: 'Andy', age: 31)

tjackiw

$ rake db:migrate

tjackiw

require('neography') unless defined?(Neography)

ENV["NEO4J_URL"] ||= "http://localhost:7474"

uri = URI.parse(ENV["NEO4J_URL"])

neo = Neography::Rest.new(uri.to_s)

Neography.configure do |c|
  c.server = uri.host

tjackiw

class Friendship < ActiveRecord::Base
  include Neoid::Relationship
  
  attr_accessible :friend

  belongs_to :user
  belongs_to :friend, class_name: User

  neoidable do |c| 
    c.relationship start_node: :user, end_node: :friend, type: :friends

tjackiw

class User < ActiveRecord::Base
  include Neoid::Node

  attr_accessible :name, :age
  
  has_many :friends, class_name: Friendship
  
  neoidable do |c|
    c.field :name
  end