如何在rails中加载这个yml文件？

development:
  api_key: YOUR_API_KEY
  database:
    host: localhost
    username: root
    password: password

production:
  api_key: YOUR_API_KEY
  database:
    host: production_host
    username: production_user
    password: production_password

require 'yaml'

# 加载YAML文件
config_file = Rails.root.join('config', 'settings.yml')
config = YAML.load_file(config_file)

# 根据当前环境获取配置信息
env_config = config[Rails.env]

# 将配置信息设置为全局变量
Rails.application.config.api_key = env_config['api_key']
Rails.application.config.database_host = env_config['database']['host']
Rails.application.config.database_username = env_config['database']['username']
Rails.application.config.database_password = env_config['database']['password']

class UsersController < ApplicationController
  def index
    api_key = Rails.application.config.api_key
    database_host = Rails.application.config.database_host
    database_username = Rails.application.config.database_username
    database_password = Rails.application.config.database_password

    # 使用配置信息进行操作
    # ...
  end
end