将 Ruby Gem 连接到 Rails 数据库

Question

I'm modifying a Ruby Gem to allow it to modify a Rails database via a rake task.

I was able to connect the database and modify its content by passing the database configuration as parameters to the rake task, which then called the ActiveRecord::Base.establish_connection . My question is, how could the Gem connect to the Rails database without having to specify the database configuration as parameters in the rake task.

Answer 1

Assuming the gem has access to the Rails.application , you can access the database config file with

db_config = Rails.application.config.database_configuration[Rails.env]

If it doesn't, you can parse the file yourself.

db_config = YAML.load(ERB.new(File.read('./config/database.yml')).result)

Once you have your configuration, you can pass it into the connector.