rake task memo

#rails

list the rake tasks

bundle exec rake -XT
bundle exec rake -T -A

ActiveRecord::PendingMigrationError

$bundle exec rake db:migrate:status

up     20180801105656  Add index to xxx
up     20180801253463  Add index xxx to yyy
down   20180811342424  Add timestanps to something

$bundle exec db:migrate RAILS_ENV=development

Routing

bundle exec rake routes | grep some_resource

http://localhost:3000/rails/info/routes

Making rake task

make a file under /lib/tasks/
- example: /lib/tasks/db:migrate:do_it.rake
write your task

namespace 'eat' do
  desc "description. It's shown when you type rake -XT"
  task :sandwich => :environment do
    sandwich = Sandwich.first
    person = Person.first.eat(sandwich).save
  end
end