更新到 Rails 5.1.4：Bundler 找不到 gem "rack" 的兼容版本

Question

我的 Rails 应用程序是 4.2.7，我正在更新到 5.1.4。当我更改 Gemfile 时： gem 'rails', '5.1.4' 然后运行 bundle update rails，我得到这个错误：

Bundler could not find compatible versions for gem "rack":
  In Gemfile:
    rails (= 5.1.4) was resolved to 5.1.4, which depends on
      actionpack (= 5.1.4) was resolved to 5.1.4, which depends on
        rack (~> 2.0)

    mailcatcher was resolved to 0.6.5, which depends on
      rack (~> 1.5)

我查看了 rack releases，但我不知道如何处理这些信息。我该如何解决这个问题？

我将粘贴整个 Gemfile，以免遗漏任何内容：

source 'https://rubygems.org'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '5.1.4'
# Use postgres as the database for Active Record
gem 'pg'
# Use SCSS for stylesheets
gem 'sass-rails' # , '~> 4.0.3'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails'

gem 'haml-rails'
# See https://github.com/sstephenson/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'
gem 'jquery-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

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

# 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

# Use debugger
# gem 'debugger', group: [:development, :test]

gem 'rspec-rails', group: [:development, :test]
gem 'spinach-rails', group: [:development, :test]
gem 'database_cleaner', group: :test
gem 'simplecov', require: false, group: :test
gem 'selenium-webdriver', group: [:development, :test]
gem 'cancancan', '~> 1.10'

gem 'mailcatcher'
gem 'settingslogic'
gem 'devise'
gem 'factory_girl_rails', group: [:development, :test, :production]
gem 'capybara', '~> 2.7.1', group: [:development, :test]
gem 'faker'
gem 'yard', group: :development

gem 'pry-rails', group: :development
gem 'bootstrap-sass', '~> 3.3.1'
gem 'autoprefixer-rails'

gem 'simple_form'
gem 'jquery-datatables-rails', '~> 3.3.0'
gem 'jquery-ui-rails'
gem 'ajax-datatables-rails'
gem "font-awesome-rails"
gem "breadcrumbs_on_rails"
gem 'bootstrap-datepicker-rails', require: 'bootstrap-datepicker-rails', git: 'git://github.com/Nerian/bootstrap-datepicker-rails.git'
gem "font-ionicons-rails"

gem 'rack-mini-profiler', group: :development
gem "rails_best_practices", group: :development
gem 'rubocop', '~> 0.40.0', require: false, group: :development
gem 'nested_form', github: 'ryanb/nested_form'
gem "i18n-js", ">= 3.0.0.rc11"

gem 'public_activity', '~> 1.4.1'
gem 'rename', '~> 1.0.2'

gem 'charlock_holmes'
gem 'delayed_job_active_record'

gem 'carrierwave'

# PDF viewer
gem 'pdfjs_rails'

# Paginate
gem 'kaminari'
gem 'bootstrap-kaminari-views', '~> 0.0.5'

# Detect mobile/tablet device, browser type, etc.
gem 'browser'

gem 'prawn'
gem 'prawn-table'
gem 'rubyzip'
gem 'axlsx', '~> 2.0.1'
gem 'axlsx_rails'
gem 'bootstrap-multiselect-rails', '~> 0.9.9'
gem 'whenever', require: false
gem 'turnout'

gem 'ranked-model'

group :production do
  gem 'capistrano', '~> 3.5'
  gem 'capistrano-rails', '~> 1.1.0'
  gem 'capistrano-bundler'
  gem 'capistrano-rbenv', '~> 2.0'
  gem 'unicorn'
end

Answer 1

删除 Gemfile.lock 然后 bundle update 解决了这个问题。

更新到 Rails 5.1.4：Bundler 找不到 gem "rack" 的兼容版本

Updating to Rails 5.1.4: Bundler could not find compatible versions for gem "rack"

rack

ruby-on-rails-4

ruby-on-rails-5