如何构建任务“ db：populate”

  1 namespace :db do
  2   desc \"Fill database with sample videos\"
  3   task :populate => :environment do
  4     require \'faker\'
  5     Rake::Task[\'db:reset\'].invoke
  6     100.times do |n|
  7       headline = Faker::Lorem.sentence(3)
  8       video = Faker::Lorem.words(5)
  9       Video.create!(:headline => headline,
 10                   :video => video)
 11     end
 12   end
 13 end

rake db:populate

Don\'t know how to build task \'db:populate\'

lib/tasks/sample_data.rake

git merge

push