小编Fja*_*cka的帖子

我通过自制软件安装了mysql.创建了数据库prestamoApp_development我启动了服务器(mysql.server start),然后创建了一个新的空项目(rails new prestamoApp -d mysql).最后在database.yml文件中配置了用户和密码,如下所示:

default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: pqdsimple
  socket: /tmp/mysql.sock

development:
  <<: *default
  database: prestamoApp_development

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: prestamoApp_test

# As with config/secrets.yml, you never want to store sensitive information,
# like your database password, …

我试图了解这段代码是如何工作的.我知道三元运算符是,condition ? option1 : option2但我不知道这在这种情况下是如何工作的.

constructor(minSupport: number, minConfidence: number, debugMode: boolean) {
            this.minSupport = minSupport ? minSupport === 0 ? 0 : minSupport : 0.15;
            this.minConfidence = minConfidence ? minConfidence === 0 ? 0 : minConfidence : 0.6;
            this.debugMode = debugMode || false;
        }