Neo4j.rb is an Active Model compliant Ruby/JRuby wrapper for the Neo4j graph database. It uses the neo4j-core and active_attr gems.
Neo4j.rb is an Active Model compliant Ruby/JRuby wrapper for the Neo4j graph database.
Questions tagged [neo4j.rb]
175 questions
1
vote
1 answer
Neo4j.rb How to merge two realtionship between node
class User
include Neo4j::ActiveNode
has_many :in, :homes, origin: :owner
has_many :in, :shared_homes, origin: :home_mates, model_class: 'Home'
end
class Home
include Neo4j::ActiveNode
has_many :out, :housemates, type: :home_mate,…
Vishal G
- 1,521
- 11
- 30
1
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1 answer
What's the best way to create Models using Neo4j.rb for an existing Neo4j database?
To create nodes in Neo4j with the Neo4j.rb gem, for an empty database, you'd first define the model class as seen in the examples here: http://neo4jrb.readthedocs.io/en/7.2.x/ActiveNode.html
Let's say you have a work project with an existing Neo4j…
Grace
- 33
- 2
1
vote
1 answer
Neo4jrb with rails --api: return connected nodes
Super simple setup:
Created a new rails app with --api and added the generator/framework
Created a single model (Artefacts) with a name attribute and a has_many relationship to other Artefacts (boringly named .artefacts)
Created 2 nodes, and joined…
joshfindit
- 611
- 6
- 27
1
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0 answers
Rails on Neo4j, using Devise -> undefined method `find_for_oauth' for Neo4j
Running rails 4.2.6, ruby 2.3.1p112 with Neo4j Community edition.
On callback from Facebook I get this error:
undefined method `find_for_oauth' for Neo4j::Shared::Identity:Module
On models/user.rb:
identity = Identity.find_for_oauth(auth)
My files…
user844214
- 21
- 1
1
vote
0 answers
Java Error in Neo4j Rails Not Allowing Server to Start
I'm using Neo4j for my rails app. It was working fine a few days ago, but when I tried to start the server today, it wouldn't start. I checked out the log and got this error
Exception in thread "Thread-11" java.lang.RuntimeException:…
Nimayi Dixit
- 41
- 2
1
vote
1 answer
Neo4jrb: a way to query for the model_class while doing collection_select
Is there a way to have a couple generic lines of code that can return results from the correct model_class based on the the model definition, and not on the lines of code?
Right now, I'm using a generator to create:
<%=…
joshfindit
- 611
- 6
- 27
1
vote
3 answers
Neo4jrb - Cypher query
I have a database like in this question:
Neo4j - Finding the Shortest Path between two nodes based on relationship property
CREATE (some_point_1:Point {title:'Some Point 1'})
CREATE (some_point_2:Point {title:'Some Point 2'})
CREATE…
Jett Kam
- 77
- 1
- 5
1
vote
1 answer
neo4jrb - Save ActiveRel property from node
I have a ActiveNode like this:
class Nodeexample
include Neo4j::ActiveNode
property :name
validates :name, :presence => true
has_many :in, :nodeexamples, rel_class: :SomeRel
end
and a ActiveRel model like this:
class SomeRel
include…
Jett Kam
- 77
- 1
- 5
1
vote
1 answer
How can I use order and find_each in neo4j.rb, Rails?
I use Neo4j.rb in Rails.
I am trying this code.
Person.all.order("n.score").find_each
or
Person.order(score: :asc).find_each
But,its does not get person order by.
Yuki Kunishige
- 13
- 2
1
vote
1 answer
undefined method `find_by' for nil:NilClass when using `model_class: false`
undefined method 'find_by' for nil:NilClass
Extracted source (around line #38):
def update
respond_to do |format|
if @tag.update(tag_params)
format.html { redirect_to @tag, notice: 'Tag was successfully updated.' }
format.json {…
joshfindit
- 611
- 6
- 27
1
vote
1 answer
Neo4jrb: Enumerator for model_class: false
When specifying a model_class of false, it's expected that the connection from this node to another could be any other class of node.
Is there a reciprocal enumerator so that we can call something like:
ActiveNodes.all
when giving the user a…
joshfindit
- 611
- 6
- 27
1
vote
1 answer
How to get value of field from Neo4j database by neo4j.rb in Rails?
Which method has neo4j.rb to get value of field from Neo4j database?
Dan Mukh
- 35
- 4
1
vote
2 answers
How to format output (Remove session data) of custom cypher query with Neo4j::Session.query
I'm using Neo4jrb/Neo4j-core for custom cypher querying in my Rails application. I use this output as json. However, everytime I run a query
Eg:
output_hash = Neo4j::Session.query("Match (n) return n limit 1;")
Along with the results I also get a…
Nein
- 389
- 2
- 4
- 12
1
vote
1 answer
Neo4j.rb returns models with incorrect class for nodes with multiple labels
I have two ActiveNode models:
class Company
include Neo4j::ActiveNode
end
and
class Entity
include Neo4j::ActiveNode
end
They correspond to the labels "Entity" and "Company", which are attached to the same node. So, a node and be an entity…
Niels Jansen
- 13
- 2
1
vote
1 answer
Searching nth-level friends in neo4j.rb in bi-directional relationship graph
I have a User class defined as below
class User
include Neo4j::ActiveNode
include Neo4j::Timestamps
property :user_id, type: Integer, constraint: :unique
property :max_friends_count, type: Integer, default: 5
validates :user_id, :presence…
user2172335
- 101
- 1
- 10