为不同的环境配置带有rails的Neo4j

Question

I have configured Neo4j in development environment using neo4j core gem.

To create a new connection, i have used the below code in application.rb

Application.rb

neo4j_adaptor = Neo4j::Core::CypherSession::Adaptors::HTTP.new('http://localhost:7474')
neo4j_session = Neo4j::Core::CypherSession.new(neo4j_adaptor)

How to configure the neo4j so that development environment and test environment uses different database.

eg: for development sample_development and for running rspec sample_test.

Answer 1

I don't know how much experience you have with Rails. But in rails you mainly have 3 environments be default:

1- development

2- test

3- production

You can have different configs for different environments as shown in this SO question:

Best way to create custom config options for my Rails app?

Last thing, I would not recommend to use the Neo4j adapter directly unless you are really experienced and need direct access to it because of business requirements.

I'd recommend to use Neo4jrb wrapper around the core adapter as shown here:

https://neo4jrb.readthedocs.io/en/9.2.x/Setup.html#generating-a-new-app

---

UPDATE

Create a file called neo4j.yml inside config directory in your project with following code:

development:
  neo4j_api: http://localhost:7474

test:
  neo4j_api: http://something_else:7474

production:
  neo4j_api: http://maybe_something_else:7474

then create an initializer in your project lets call it neo4j.rb so its path should be: config/initializers/neo4j.rb .

Inside this initializer put the following code:

NEO4J_CONFIG = YAML.load_file(Rails.root.join('config/neo4j.yml'))[Rails.env]

Then you will have the NEO4J_CONFIG accessible at any part of your rails application like:

NEO4J_CONFIG['neo4j_api']

and your code should look like:

neo4j_adaptor = Neo4j::Core::CypherSession::Adaptors::HTTP.new(NEO4J_CONFIG['neo4j_api'])
neo4j_session = Neo4j::Core::CypherSession.new(neo4j_adaptor)