undefined method `desc' for Sinatra::Application:Class

Question

This is the error I get when I run any rake command: undefined method 'desc' for Sinatra::Application:Class

# app.rb
require 'sinatra'
require 'sinatra/activerecord'
require 'sinatra/contrib'

get '/' do
  puts "Hello World"
end

# config.ru
require "./app"
run Sinatra::Application

# Rakefile
require './app'
require 'sinatra/activerecord/rake'

# Gemfile
source 'https://rubygems.org'
ruby '2.0.0'

gem 'activerecord', '~> 4.0.2'
gem 'sinatra', '~> 1.4.4'
gem 'sinatra-activerecord', '~> 1.2.3'
gem 'sinatra-contrib', '~> 1.4.2'

Full trace:

/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-contrib-1.4.2/lib/sinatra/namespace.rb:269:in `method_missing'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-activerecord-1.2.3/lib/sinatra/activerecord/tasks.rake:4:in `block in <top (required)>'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-contrib-1.4.2/lib/sinatra/namespace.rb:126:in `class_eval'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-contrib-1.4.2/lib/sinatra/namespace.rb:126:in `block in new'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-contrib-1.4.2/lib/sinatra/namespace.rb:118:in `initialize'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-contrib-1.4.2/lib/sinatra/namespace.rb:118:in `new'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-contrib-1.4.2/lib/sinatra/namespace.rb:118:in `new'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-contrib-1.4.2/lib/sinatra/namespace.rb:142:in `namespace'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.4/lib/sinatra/base.rb:1972:in `block (2 levels) in delegate'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-activerecord-1.2.3/lib/sinatra/activerecord/tasks.rake:3:in `<top (required)>'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:223:in `load'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:223:in `block in load'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:214:in `load_dependency'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:223:in `load'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-activerecord-1.2.3/lib/sinatra/activerecord/rake.rb:77:in `<top (required)>'
/Users/j/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:51:in `require'
/Users/j/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:51:in `require'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/backports-3.3.5/lib/backports/tools.rb:328:in `require_with_backports'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `block in require'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:214:in `load_dependency'
/Users/j/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in `require'
/Users/j/Desktop/app/Rakefile:2:in `<top (required)>'
/Users/j/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/rake_module.rb:25:in `load'
/Users/j/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/rake_module.rb:25:in `load_rakefile'
/Users/j/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:637:in `raw_load_rakefile'
/Users/j/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:94:in `block in load_rakefile'
/Users/j/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:165:in `standard_exception_handling'
/Users/j/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:93:in `load_rakefile'
/Users/j/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:77:in `block in run'
/Users/j/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:165:in `standard_exception_handling'
/Users/j/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:75:in `run'
/Users/j/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/bin/rake:33:in `<top (required)>'
/Users/j/.rvm/gems/ruby-2.0.0-p247@global/bin/rake:23:in `load'
/Users/j/.rvm/gems/ruby-2.0.0-p247@global/bin/rake:23:in `<main>'
/Users/j/.rvm/gems/ruby-2.0.0-p247/bin/ruby_executable_hooks:15:in `eval'
/Users/j/.rvm/gems/ruby-2.0.0-p247/bin/ruby_executable_hooks:15:in `<main>'

Answer 1

Found an easiest solution:

Juste add the require:false attribute to sinatra contrib in your gemfile:

gem "sinatra-contrib",require: false

Found this here:

http://aaronlerch.github.io/blog/sinatra-bundler-and-the-global-namespace/

Answer 2

The Sinatra namespace extension from Sinatra contrib is interfering with Rake’s own namespace support. They both define a namespace method, and the Sinatra contrib version is being called (incorrectly) from the Sinatra-ActiveRecord Rake tasks.

If you’re not using the namespaces from Sinatra-contrib, then the easiest solution would be to only require those extensions that you need; e.g. change

require 'sinatra/contrib'

to

require 'sinatra/whatever'
require 'sinatra/anotherextension'

If you are using Sinatra namespaces then I think you may be able to get round this by moving to a modular style app. Change your app.rb to something like

require 'sinatra/base' # note this has changed from just 'sinatra'
require 'sinatra/activerecord'
require 'sinatra/contrib'

class MyApp < Sinatra::Base
  register Sinatra::Contrib

  get '/' do
    "Hello World"
  end

  # other routes etc. as needed
end

Then in your config.ru you need run MyApp rather then run Sinatra::Application (of course you can – and should – give your class a better name). This avoids the collision of the two namespace methods, since the Sinatra version is only available in your application class, not the top level.