My rake task is not showing up in rake -T

Question

I don't know wtf is going on but I just created a new Rails app and can't get any rake tasks to work or show up in $ rake -T

lib/tasks/hello.rake

namespace :hello do 
  desc "hello"
  task :you do 
    puts "hello"
  end
end

$ rake -T

it does not show up in there

$ rake hello:you

rake aborted! Don't know how to build task 'hello:you' (see --tasks)

Gemfile

source 'https://rubygems.org'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.2'
# Use sqlite3 as the database for Active Record
gem 'sqlite3'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc

gem 'carrierwave', github: 'carrierwaveuploader/carrierwave'
gem 'mini_magick',             '3.8.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug'
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console', '~> 2.0'

  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
end

Confirm that you haven't used a different extension (e.g. `hello.rb`). — Gerry, May 20 '17 at 13:40
I hope u have saved the file after writing the task as there doesn't seem any syntax error. Also tried restarting the terminal? — Md. Farhan Memon, May 20 '17 at 13:50
Also try running `rake hello:you --trace` to see full trace (and add it to your question). — Gerry, May 20 '17 at 13:52

score 38 · Answer 1 · answered Oct 14 '20 at 09:29

38

It could be that you've given the task the .rb extension instead of .rake

answered Oct 14 '20 at 09:29

Chris Harrison

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2

It's an easy mistake to make. One I've made a couple of times since writing this answer! – Chris Harrison Sep 15 '21 at 16:24
You're a genius! :) – EugZol Oct 24 '21 at 22:51

score 25 · Accepted Answer · edited Sep 13 '22 at 18:41

25

If you want a really complete list of all rake tasks, you need to run rake -T -A.

edited Sep 13 '22 at 18:41

Brian Nicholls

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answered Sep 17 '17 at 07:22

Fatos Morina

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3

-A Show all tasks, even uncommented ones. So the real problem is that the task is missing a comment. The task is shown in the list as soon as you add a description for it as @aardvarkk explained. – Fran Martinez Nov 11 '20 at 15:02

score 15 · Answer 3 · answered Apr 16 '20 at 21:29

15

I had this problem, but it was due to the fact that I hadn't provided a description for my task. Once I added desc 'Hello World' above my task block, the task showed up in the list.

answered Apr 16 '20 at 21:29

aardvarkk

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Yup. That did it. – smilingfrog Sep 24 '21 at 19:02

score 2 · Answer 4 · answered Sep 17 '21 at 02:04

2

My solution was that I had the incorrect directory. I created custom tasks under Rails.root/app/lib/tasks when it should have been Rails.root/lib/tasks.

Only realized this after running the command bin/rails generate task as per the Rails guides.

answered Sep 17 '21 at 02:04

samkpower

71
3

My rake task is not showing up in rake -T

4 Answers4