`rails db:migrate:reset` 和 `rails db:reset` 的区别
Difference between rake db:migrate db:reset and db:schema:load
db:reset runs db:drop db:setup
db:migrate:reset runs db:drop db:create db:migrate
db:setup runs db:schema:load, db:seed
所以 db:reset runs db:drop db:schema:load, db:seed