ruby Rails 5.2读取配置文件并实例化全局对象

Posted 2021-05-15

# config/redis.yml
redis: &redis
   redis_server: <%= ENV["REDIS_SERVER"] || '127.0.0.1' %>
   redis_port: <%= ENV["REDIS_PORT"] || 6379 %>
   redis_db_num: <%= ENV["REDIS_DB_NUM"] || 0 %>

development:
  <<: *redis

test:
  <<: *redis

production:
  <<: *redis

# config/initializers
require 'redis'

# load config/redis.yml file to hash
redis = Rails.application.config_for(:redis).symbolize_keys!

redis_server = redis[:redis_server]
redis_port   = redis[:redis_port]
redis_db_num = redis[:redis_db_num]

# instantiate global objects $redis
$redis = Redis.new(host: redis_server, port: redis_port, db: redis_db_num)