问题
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
回答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.
来源：https://stackoverflow.com/questions/30770914/how-do-i-create-a-neo4j-relationship-via-the-rails-console