How many rake tasks can be run at once in rails?

Why is my custom rake task in lib/tasks not discovered in Rails 3?

• Build-in rake tasks work fine, but my new custom one in Project/lib/tasks/payments.rb doesn't get loaded: namespace :payments do desc "Tally payments at the end of the month" task :compute => :environment do BillingPeriod.compute_new_period end end $ rake payments:compute (in /Users/rob/Code/Apps/skyfarm) rake aborted! Don't know how to build task 'payments:compute' It works fine if I load the file application.rb: require 'lib/tasks/payments.rb' ...but it breaks other things: $ rails s ./lib/tasks/payments.rb:1: undefined method `namespace' for main:Object (NoMethodError)

• Answer:

  It doesn't work because rake tasks are supposed to end in .rake, not .rb. So change payments.rb to payments.rake and it should work fine.