Neo4j MetaModel

neo4j-meta_model is a Rails engine for providing a web user interface for easily managing neo4j databases. It can be included in your Rails app or used independently via the neo4j-meta_model-app application.

Concepts

The neo4j gem is used behind the scenes, and so the concepts of Models and Associations are exposed directly in neo4j-meta_model

• Models Models correspond to Neo4j Labels. Models define which properties which we are concerned with as well as validations and business logic. Models also support inheritance. Currently neo4j-meta_model supports properties and inheritance but not validation or custom business logic.
• Associations Associations specify which nodes are related to a node under consideration. For example, if there are Person and Article models with a WROTE_ARTICLE relationship between them, one might define an articles association for the Person model and an author association for the Article model, both of which use the WROTE_ARTICLE relationship. In neo4j-meta_model, both associations are always defined at the same time.

Interface

neo4j-meta_model has two main sections: one for managing your domain model, and one for editing records in the domain model.

Domain Model Management (Admin)

Models

Models can be added by going to the section for Models and entering a new name for your model. Once a model has been added, click it in the list to edit.

When editing models, you can define if the model inherits properties from other models and what properties the model has. Properties are the slots where data is stored in records for those models. The ID Property is a property which is unique across all records in the model. If you do not choose an ID Property, a uuid property will be created automatically.

Associations

In neo4j-meta_model, opposite pair associations are always defined at the same time. The following diagram is used in a couple of places to describe associations.

In this case it indicates a many-to-many relationship where:

• the Person model has a gists association
• the Gist model has a writers association
• the WRITER_OF relationship type is used to query the associations

Installation

Gemfile

gem 'neo4j-meta_model', require: 'neo4j/meta_model'

In your environment (config/application.rb or config/environments/development.rb for example)

config.neo4j.session_type = :server_db 
config.neo4j.session_path = 'http://localhost:7474'

config/routes.rb

mount Neo4j::MetaModel::Engine => "/mount/path"

This project rocks and uses MIT-LICENSE.