Question

这是我运行任何rake命令时遇到的错误：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'

完整追踪：

/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

找到最简单的解决方案：

Juste将gem：false属性添加到gemfile中的sinatra contrib：

gem "sinatra-contrib",require: false

在此处找到：

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

Answer 2

来自Sinatra contrib的Sinatra namespace extension正在干扰Rake自己的命名空间支持。它们都定义了namespace方法，并且Sinatra-ActiveRecord Rake tasks正在调用Sinatra contrib版本（错误地）。

如果您没有使用Sinatra-contrib的命名空间，那么最简单的解决方案是only require those extensions that you need;例如变化

require 'sinatra/contrib'

到

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

如果您正在使用Sinatra名称空间，那么我认为您可以通过转移modular style app来解决这个问题。将您的app.rb更改为

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

然后在config.ru中，您需要run MyApp，而不是run Sinatra::Application（当然，您可以 - 并且应该 - 为您的班级提供更好的名称）。这避免了两个namespace方法的冲突，因为Sinatra版本仅在您的应用程序类中可用，而不是顶层。

Sinatra的未定义方法`desc':: Application：Class

2 个答案: