development:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: myapp
  pool: 25
  username: root
  password:
  host: 127.0.0.1
  strict: false

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '';

$ cat ~/.my.cnf
[client]
user=root
password=''