[ rake ] migrate database

rake db:create && rake db:migrate && rake db:seed

NOTE : need rakefile, or Rakefile, or rakefile.rb, or Rakefile.rb

List all rake tasks

rake -T

Generating rake tasks

The code will be generated to lib/tasks/

i.e. lib/tasks/app/test.rake

namespace :app do

desc 'whatever'

task :test, [:params1] do |_, args|

puts args[:params1]

puts #{func1(args)}


def func1(args)

return if args[:params1].blank?



rake app::test[50]

rake options : –trace

ref : http://railsguides.net/how-to-generate-rake-task/

, https://edelpero.svbtle.com/everything-you-always-wanted-to-know-about-writing-good-rake-tasks-but-were-afraid-to-ask

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