The library ease the generation of test graphs. The faker library is also used to generate random property values.

You can define your graph model in YAML or in a slightly modified Cypher pattern.

The library is in its early stage and is targetted to be used in developement environment.

This library is the heart of the popular Graphgen web application

git clone https://github.com/neoxygen/neogen

cd neogen

connection:
  scheme: http
  host: localhost
  port: 7474

nodes:
  persons:
    label: Person
    count: 50
    properties:
      firstname: firstName
      lastname: lastName

  companies:
    label: Company
    count: 10
    properties:
      name: company
      description: catchPhrase

relationships:
  person_works_for:
    start: persons
    end: companies
    type: WORKS_AT
    mode: n..1

  friendships:
    start: persons
    end: persons
    type: KNOWS
    mode: n..n

vendor/bin/neogen generate

or you may want to export the generation queries to a file, handy for importing it in the Neo4j Console :

./vendor/bin/neogen generate --export="myfile.cql"

See the results in your graph browser !

• When defining properties types (like company, firstName, ...), these types refers to the standard faker types.
• count define the number of nodes you want
• relationship mode : 1 for only one existing relationship per node, random for randomized number of relationships

Sometimes you'll maybe want to define some parameters for your properties, for e.g. to have a realistic date of birth for Person nodes, you may want to be sure that the date will be between 50 years ago and 18 years ago if you set dob for people working for a company.

nodes:
  persons:
    label: Person
    count: 10
    properties:
      firstname: firstName
      date_of_birth: { type: "dateTimeBetween", params: ["-50 years", "-18 years"]}

relationships:
    person_works_for:
        start: persons
        end: companies
        type: WORKS_AT
        mode: random
        properties:
            since: { type: "dateTimeBetween", params: ["-10 years", "now"]}

//eg:
(person:Person {firstname:firstName, lastname:lastName} *30)-[:KNOWS *n..n]->(person)
(person)-[:WORKS_AT *n..1]->(company:Company {name:company, slogan:catchPhrase} *5)

For a complete description, see the Graphgen documentation

Generating the graph from a cypher pattern :

./bin/neogen generate-cypher --source="pattern.cypher" --export="export.gen"

Or you may want to import the graph directly in an accessible neo4j database :

./bin/neogen generate-cypher --source="pattern.cypher" --export-db="localhost:7474"

Contributions, feedbacks, requirements welcome. Shoot me by opening issues or PR or on twitter : @ikwattro