Neography is a thin Ruby wrapper to the Neo4j Rest API, for more information:
If you want to the full power of Neo4j, you will want to use JRuby and the excellent Neo4j.rb gem at github.com/andreasronge/neo4j by Andreas Ronge
A complement to Neography is the Neology Gem at github.com/lordkada/neology by Carlo Alberto Degli Atti
An alternative is the Architect4r Gem at github.com/namxam/architect4r by Maximilian Schulz
gem install 'neography', '0.0.14' # for version 1.4 of Neo4j
or
gem install 'neography' # for version 1.5M of Neo4j or higher
After that, in your ruby script:
require 'rubygems' require 'neography'
in order to access the functionality.
for use: json httparty for development: rspec net-http-spy
Just add gem ‘neography’ to your Gemfile and run bundle install.
The following tasks will be available to you:
rake neo4j:install # Install Neo4j to the neo4j directory under your project rake neo4j:install[community,1.6.M01] # Install Neo4j Community edition, version 1.6.M01 rake neo4j:install[advanced,1.5] # Install Neo4j Advanced edition, version 1.5 rake neo4j:install[enterprise,1.5] # Install Neo4j Enterprise edition, version 1.5 rake neo4j:start # Start Neo4j rake neo4j:stop # Stop Neo4j rake neo4j:restart # Restart Neo4j rake neo4j:reset_yes_i_am_sure # Wipe your Neo4j Database
Windows users will need to run in a command prompt with Administrative Privileges in order to install Neo4j as a Service.
If you are not using Rails, then add:
require 'neography/tasks'
to your Rakefile to have access to these tasks.
@neo = Neography::Rest.new({:protocol => 'http://', :server => 'localhost', :port => 7474, :directory => '', # use '/<my directory>' or leave out for default :authentication => 'basic', # 'basic', 'digest' or leave out for default :username => 'your username', #leave out for default :password => 'your password', #leave out for default :log_file => 'neography.log', :log_enabled => false, :max_threads => 20})
Quick initializer (assumes basic authorization if username is given):
@neo = Neography::Rest.new("http://username:[email protected]:7474/mydirectory")
To Use:
@neo = Neography::Rest.new # Inialize using all default parameters @neo.get_root # Get the root node node1 = @neo.create_node # Create an empty node node2 = @neo.create_node("age" => 31, "name" => "Max") # Create a node with some properties @neo.get_node(node2) # Get a node and its properties @neo.delete_node(node2) # Delete an unrelated node @neo.delete_node!(node2) # Delete a node and all its relationships @neo.reset_node_properties(node1, {"age" => 31}) # Reset a node's properties @neo.set_node_properties(node1, {"weight" => 200}) # Set a node's properties @neo.get_node_properties(node1) # Get just the node properties @neo.get_node_properties(node1, ["weight","age"]) # Get some of the node properties @neo.remove_node_properties(node1) # Remove all properties of a node @neo.remove_node_properties(node1, "weight") # Remove one property of a node @neo.remove_node_properties(node1, ["weight","age"]) # Remove multiple properties of a node rel1 = @neo.create_relationship("friends", node1, node2) # Create a relationship between node1 and node2 rel2 = @neo.get_relationship(rel1) # Get a relationship @neo.get_node_relationships(node1) # Get all relationships @neo.get_node_relationships(node1, "in") # Get only incoming relationships @neo.get_node_relationships(node1, "all", "enemies") # Get all relationships of type enemies @neo.get_node_relationships(node1, "in", "enemies") # Get only incoming relationships of type enemies @neo.delete_relationship(rel1) # Delete a relationship @neo.reset_relationship_properties(rel1, {"age" => 31}) # Reset a relationship's properties @neo.set_relationship_properties(rel1, {"weight" => 200}) # Set a relationship's properties @neo.get_relationship_properties(rel1) # Get just the relationship properties @neo.get_relationship_properties(rel1, ["since","met"]) # Get some of the relationship properties @neo.remove_relationship_properties(rel1) # Remove all properties of a relationship @neo.remove_relationship_properties(rel1, "since") # Remove one property of a relationship @neo.remove_relationship_properties(rel1, ["since","met"]) # Remove multiple properties of a relationship @neo.list_node_indexes # gives names and query templates for all defined indices @neo.create_node_index(name, type, provider) # creates an index, defaults are "exact" and "lucene" @neo.add_node_to_index(index, key, value, node1) # adds a node to the index with the given key/value pair @neo.remove_node_from_index(index, key, value, node1) # removes a node from the index with the given key/value pair @neo.remove_node_from_index(index, key, node1) # removes a node from the index with the given key @neo.remove_node_from_index(index, node1) # removes a node from the index @neo.get_node_index(index, key, value) # exact query of the node index with the given key/value pair @neo.find_node_index(index, key, value) # advanced query of the node index with the given key/value pair @neo.find_node_index(index, query ) # advanced query of the node index with the given query @neo.list_relationship_indexes # gives names and query templates for relationship indices @neo.create_relationship_index(name, "fulltext", provider) # creates a relationship index with "fulltext" option @neo.add_relationship_to_index(index, key, value, rel1) # adds a relationship to the index with the given key/value pair @neo.remove_relationship_from_index(index, key, value, rel1) # removes a relationship from the index with the given key/value pair @neo.remove_relationship_from_index(index, key, rel1) # removes a relationship from the index with the given key @neo.remove_relationship_from_index(index, rel1) # removes a relationship from the index @neo.get_relationship_index(index, key, value) # exact query of the relationship index with the given key/value pair @neo.find_relationship_index(index, key, value) # advanced query of the relationship index with the given key/value pair @neo.find_relationship_index(index, query) # advanced query of the relationship index with the given query @neo.execute_script("g.v(0)") # sends a Groovy script(through the Gremlin plugin) @neo.execute_query("start n=node(0) return n") # sends a Cypher query (through the Cypher plugin) @neo.get_path(node1, node2, relationships, depth=4, algorithm="shortestPath") # finds the shortest path between two nodes @neo.get_paths(node1, node2, relationships, depth=3, algorithm="allPaths") # finds all paths between two nodes nodes = @neo.traverse(node1, # the node where the traversal starts "nodes", # return_type "nodes", "relationships" or "paths" {"order" => "breadth first", # "breadth first" or "depth first" traversal order "uniqueness" => "node global", # See Uniqueness in API documentation for options. "relationships" => [{"type"=> "roommates", # A hash containg a description of the traversal "direction" => "all"}, # two relationships. {"type"=> "friends", # "direction" => "out"}], # "prune evaluator" => {"language" => "javascript", # A prune evaluator (when to stop traversing) "body" => "position.endNode().getProperty('age') < 21;"}, "return filter" => {"language" => "builtin", # "all" or "all but start node" "name" => "all"}, "depth" => 4}) # "depth" is a short-hand way of specifying a prune evaluator which prunes after a certain depth. # If not specified a depth of 1 is used and if a "prune evaluator" is specified instead of a depth, no depth limit is set.
Please see the specs for more examples.
Experimental:
nodes = @neo.create_nodes(5) # Create 5 empty nodes
nodes = @neo.create_nodes_threaded(5) # Create 5 empty nodes using threads
nodes = @neo.create_node_nodes([{"age" => 31, "name" => "Max"},
{"age" => 24, "name" => "Alex"}) # Create two nodes with properties
nodes = @neo.create_node_nodes_threaded([{"age" => 31, "name" => "Max"},
{"age" => 24, "name" => "Alex"}) # Create two nodes with properties threaded
nodes = @neo.get_nodes([17,86,397,33]) # Get four nodes by their id
one_set_nodes = @neo.create_nodes(3)
another_node = @neo.create_node("age" => 31, "name" => "Max")
nodes = @neo.get_nodes([one_set_nodes, another_node]) # Get four nodes
Trying to mimic the Neo4j.rb API.
Now we are returning full objects. The properties of the node or relationship can be accessed directly (node.name). The Neo4j ID is available by using node.neo_id .
@neo2 = Neography::Rest.new ({:server => '192.168.10.1'}) Neography::Node.create # Create an empty node Neography::Node.create("age" => 31, "name" => "Max") # Create a node with some properties Neography::Node.create(@neo2, {"age" => 31, "name" => "Max"}) # Create a node on the server defined in @neo2 Neography::Node.create({"age" => 31, "name" => "Max"}, @neo2) # Same as above, but different order Neography::Node.load(5) # Get a node and its properties by id Neography::Node.load(existing_node) # Get a node and its properties by Node Neography::Node.load("http://localhost:7474/db/data/node/2") # Get a node and its properties by String Neography::Node.load(@neo2, 5) # Get a node on the server defined in @neo2 Neography::Node.load(5, @neo2) # Same as above, but different order n1 = Node.create n1.del # Deletes the node n1.exist? # returns true/false if node exists in Neo4j n1 = Node.create("age" => 31, "name" => "Max") n1[:age] #returns 31 # Get a node property using [:key] n1.name #returns "Max" # Get a node property as a method n1[:age] = 24 # Set a node property using [:key] = n1.name = "Alex" # Set a node property as a method n1[:hair] = "black" # Add a node property using [:key] = n1.weight = 190 # Add a node property as a method n1[:name] = nil # Delete a node property using [:key] = nil n1.name = nil # Delete a node property by setting it to nil n2 = Neography::Node.create new_rel = Neography::Relationship.create(:family, n1, n2) # Create a relationship from my_node to node2 new_rel.start_node # Get the start/from node of a relationship new_rel.end_node # Get the end/to node of a relationship new_rel.other_node(n2) # Get the other node of a relationship existing_rel = Neography::Relationship.load(12) # Get an existing relationship by id existing_rel.del # Delete a relationship Neography::Relationship.create(:friends, n1, n2) n1.outgoing(:friends) << n2 # Create outgoing relationship n1.incoming(:friends) << n2 # Create incoming relationship n1.both(:friends) << n2 # Create both relationships n1.outgoing # Get nodes related by outgoing relationships n1.incoming # Get nodes related by incoming relationships n1.both # Get nodes related by any relationships n1.outgoing(:friends) # Get nodes related by outgoing friends relationship n1.incoming(:friends) # Get nodes related by incoming friends relationship n1.both(:friends) # Get nodes related by friends relationship n1.outgoing(:friends).incoming(:enemies) # Get nodes related by one of multiple relationships n1.outgoing(:friends).depth(2) # Get nodes related by friends and friends of friends n1.outgoing(:friends).depth(:all) # Get nodes related by friends until the end of the graph n1.outgoing(:friends).depth(2).include_start_node # Get n1 and nodes related by friends and friends of friends n1.outgoing(:friends).prune("position.endNode().getProperty('name') == 'Tom';") n1.outgoing(:friends).filter("position.length() == 2;") n1.rel?(:friends) # Has a friends relationship n1.rel?(:outgoing, :friends) # Has outgoing friends relationship n1.rel?(:friends, :outgoing) # same, just the other way n1.rel?(:outgoing) # Has any outgoing relationships n1.rel?(:both) # Has any relationships n1.rel?(:all) # same as above n1.rel? # same as above n1.rels # Get node relationships n1.rels(:friends) # Get friends relationships n1.rels(:friends).outgoing # Get outgoing friends relationships n1.rels(:friends).incoming # Get incoming friends relationships n1.rels(:friends,:work) # Get friends and work relationships n1.rels(:friends,:work).outgoing # Get outgoing friends and work relationships n1.all_paths_to(n2).incoming(:friends).depth(4) # Gets all paths of a specified type n1.all_simple_paths_to(n2).incoming(:friends).depth(4) # for the relationships defined n1.all_shortest_paths_to(n2).incoming(:friends).depth(4) # at a maximum depth n1.path_to(n2).incoming(:friends).depth(4) # Same as above, but just one path. n1.simple_path_to(n2).incoming(:friends).depth(4) n1.shortest_path_to(n2).incoming(:friends).depth(4) n1.shortest_path_to(n2).incoming(:friends).depth(4).rels # Gets just relationships in path n1.shortest_path_to(n2).incoming(:friends).depth(4).nodes # Gets just nodes in path
See Neo4j API for:
A couple of examples borrowed from Matthew Deiters’s Neo4jr-social:
Phase 2 way of doing these:
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Phase 2 Index functionality
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More Tests
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More Examples
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Mixins ?
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Neography - MIT, see the LICENSE file github.com/maxdemarzi/neography/tree/master/LICENSE.
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Lucene - Apache, see lucene.apache.org/java/docs/features.html
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Neo4j - Dual free software/commercial license, see neo4j.org