Keymaker

A multi-layer REST API Ruby wrapper for the Neo4j graph database built on top of Faraday.

• Layer 1 interacts with the Neo4j REST API raw requests
• Layer 2 binds the raw HTTP requests into Ruby Objects
• Layer 3 implements ActiveModel and treats Nodes and Relationships as Ruby Objects

Oracle: Our time is up. Listen to me, Neo.
        You can save Zion if you reach The Source,
        but to do that you will need the Keymaker.
Neo:    The Keymaker?

Installation

Install and start the Neo4j server:

rake neo4j:install
rake neo4j:start
# optionally for testing
rake neo4j:install RAILS_ENV=test
rake neo4j:start RAILS_ENV=test

Add this line to your application's Gemfile:

gem "keymaker"

And then execute:

$ bundle

Usage

Configuration

Create a config/neo4j.yml file:

development:
  server: localhost
  port: 7474
test:
  server: localhost
  port: 7475

Then, create a Rails initializer config/initializers/keymaker.rb:

if Rails.env.development? || Rails.env.test?
  database_config = YAML::load_file("config/neo4j.yml")
  Keymaker.configure do |c|
    c.server = database_config["#{Rails.env}"]["server"]
    c.port = database_config["#{Rails.env}"]["port"]
  end
else
  # Heroku neo4j add-on
  Keymaker.configure do |c|
    c.server = ENV["NEO4J_HOST"]
    c.port = ENV["NEO4J_PORT"]
    c.username = ENV["NEO4J_LOGIN"]
    c.password = ENV["NEO4J_PASSWORD"]
  end
end

Low-level REST API Calls

Keymaker.configure do |c|
  c.server = "localhost"
  c.port = 7474
end

## Create a node ##

terminator_response = Keymaker.service.create_node_request({:name => "Terminator",
                                                            :catch_phrase => "I'll be back"})
terminator = Keymaker.service.get_node(terminator_response.neo4j_id)
 
john_response = Keymaker.service.create_node_request({:name => "John Connor",
                                                      :catch_phrase => "No problemo"})

john_connor = Keymaker.service.get_node(john_response.neo4j_id)
john_connor.name # => "John Connor"
john_connor.catch_phrase # => "No problemo"

## Update node properties ##

Keymaker.service.update_node_properties_request({:node_id => john_connor.neo4j_id,
                                                 :catch_phrase => "Easy money!"})
john_connor.catch_phrase # => "Easy money!"

## Delete a node ##

Keymaker.service.delete_node_request({:node_id => john_connor.neo4j_id})
Keymaker.service.get_node_request({:node_id => john_connor.neo4j_id})
# => Keymaker::ResourceNotFound raised

## Create a relationship ##

rel = Keymaker.service.create_relationship_request({:node_id => john_connor.neo4j_id,
                                                    :end_node_id => terminator.neo4j_id,
                                                    :rel_type => "knows",
                                                    :data => {:since => "Summer of 1984"})

## Delete a relationship ##

Keymaker.service.delete_relationship_request(:relationship_id => rel.neo4j_id)

Models

class People
  include Keymaker::Node
    
  property :name, String
  property :age, Integer
  property :title, String
  
  # creates an index called people with keys name and age
  index :people, :on => :name
  index :people, :on => :age

end

## in some controller ##
node = People.new(:name => 'Trinity', :title => 'computer programmer and hacker', :age => '27')
node.save

Nodes

Coming soon

Relationships

Coming soon

Indices

Coming soon

Querying

## Cypher #

results = Keymaker.service.execute_cypher("START n=node:tests(name='Trinity') return n", {})

Contributing

1. Fork it
2. Create a feature branch (git checkout -b my_new_feature)
3. Write passing tests!
4. Commit your changes (git commit -v)
5. Push to the branch (git push origin my_new_feature)
6. Create new Pull Request

TODO:

• Test coverage
• Contributing documentation (installing neo4j, etc).
• Documentation

Acknowledgements

• Avdi Grimm
• Micah Cooper
• Stephen Caudill
• Travis Anderson

Copyright

Copyright (c) 2012 Rogelio J. Samour See LICENSE for details.