main:Object 的未定义方法“命名空间”(NoMethodError) - 活动记录/rakefile

我正在尝试运行一个基本的 Sinatra 应用程序。当我进入“机架”步骤时，出现错误：

/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/railties/databases.rake:3:in `<top (required)>': undefined method `namespace' for main:Object (NoMethodError)

这似乎是 Rake gem 中的范围问题。我没有找到答案，而且不太确定需要修复什么。我确实更新了我的所有宝石，希望这会有所帮助，但无济于事。这是我的代码，可能会有所贡献......

    rakefile.rb
       require "./frank"
       require "sinatra/activerecord/rake"

    config.ru
        require_relative 'frank'
        map('/welcomes') { run WelcomesController }

    frank.rb
        require 'sinatra/base'
        require 'active_record'
        require 'bcrypt'

        Dir.glob('./{controllers,models}/*rb').each { |file| require file }

        ENV['SINATRA_ENV'] ||= 'development'

        ActiveRecord::Base.establish_connection(
            :adapter => 'sqlite3',
            :database => "db/#{ENV['SINATRA_ENV']}.sqlite"
        )

    spec_helper.rb
        ENV['SINATRA_ENV'] = 'test'
        require_relative '../frank'
        require 'capybara'
        require 'database_cleaner'
        Capybara.app = Rack::Builder.parse_file(File.expand_path('../../config.ru',__FILE__)).first
    RSpec.configure do |config|
        config.include Capybara::DSL
        config.before(:suite) do
            DatabaseCleaner.clean_with(:truncation)
    end
    config.before(:each) do
          DatabaseCleaner.strategy = :transaction
    end
    config.before(:each) do
          DatabaseCleaner.start
    end
    config.after(:each) do
        DatabaseCleaner.clean
    end
end

非常感谢 ：）

这是主要错误的下方：

    from /Users/stephaniedean/.rvm/gems/ruby-2.2.1/gems/sinatra-activerecord-2.0.6/lib/sinatra/activerecord/rake.rb:1:in `load'
    from /Users/stephaniedean/.rvm/gems/ruby-2.2.1/gems/sinatra-activerecord-2.0.6/lib/sinatra/activerecord/rake.rb:1:in `<top (required)>'

所以，它看起来像 sinatra-activerecord 而不仅仅是 activerecord。我确实尝试了 activerecord 3.2.17，但没有成功。感谢您的建议。

在我找到解决方案之前，这花了我几个小时的时间：

http://aaronlerch.github.io/blog/sinatra-bundler-and-the-global-namespace/ http://aaronlerch.github.io/blog/sinatra-bundler-and-the-global-namespace/ https://github.com/sinatra/sinatra-contrib/issues/111 https://github.com/sinatra/sinatra-contrib/issues/111

Gemfile

gem "sinatra", require: 'sinatra/base'
gem 'sinatra-activerecord', require: false
gem 'sinatra-contrib', require: false

环境.rb

require 'bundler/setup'
require 'rake'
require 'sinatra'
require 'sinatra/reloader'
require 'sinatra/activerecord'
require 'sinatra/activerecord/rake'

确保

require 'rake'

before

require 'sinatra/activerecord/rake'