如何通过Rails控制台创建Neo4j关系？

Question

I'm currently working through this tutorial and I'm stuck when it comes to creating relationships in the rails console. I've read through the Neo4jrb project documentation and a blog post on jayway.com but still can't figure it out.

I've created a rails site and I want to create team nodes, league nodes, and relationships between them in a Neo4j database using my rails scripts. I have two models:

One for League

class Team 
include Neo4j::ActiveNode
property :name, type: String

has_one :out, :league, type: :PLAY_IN

end

One for Team

class League 
include Neo4j::ActiveNode
property :name, type: String
property :rank, type: Integer

has_many :in, :teams, origin: :league

end

Using the rails console, I can create a node using this code:

League.create(name: "League 2")

Using the console, how do I create a relationship between two nodes as defined in my models?

Here is my code in github. Thanks in advance!

** Edit **

Removed: model_class

Answer 1

There's an example of creating a relationship between nodes under the Associations heading of the ActiveNode section of the wiki, https://github.com/neo4jrb/neo4j/wiki/Neo4j%3A%3AActiveNode#associations . You do node_a.association_name << node_b . team.league = league and league.teams << team will create the same relationship since you've set them up to refer to the same relationship type and reciprocal directions in the database.

There's a ton of information in the wiki, I suggest you read through all the modern stuff. Don't worry about anything in the "Legacy" section. New docs are also being worked on at http://neo4jrb.readthedocs.org/en/stable/ but there's still a bit to do. There's also a chat room at https://gitter.im/neo4jrb/neo4j , in case you ever want to talk through something.

** EDIT **

As Brian pointed out, there's an issue with your model_class . I was focusing on how you do it and didn't look too closely at the models, see his comments for info.