Ruby -无法用actionpack解决依赖关系

Question

我做了一个包安装和包更新，发现在终端中一直有相同的错误：

Bundler could not find compatible versions for gem "actionpack":
  In Gemfile:
    actionpack (~> 5.0.0)

    rails (~> 5.0.0) was resolved to 5.0.0, which depends on
      railties (= 5.0.0) was resolved to 5.0.0, which depends on
        actionpack (= 5.0.0)

    rails (~> 5.0.0) was resolved to 5.0.0, which depends on
      railties (= 5.0.0) was resolved to 5.0.0, which depends on
        actionpack (= 5.0.0)

    rails (~> 5.0.0) was resolved to 5.0.0, which depends on
      railties (= 5.0.0) was resolved to 5.0.0, which depends on
        actionpack (= 5.0.0)

    simple_form (~> 3.0.2) was resolved to 3.0.2, which depends on
      actionpack (~> 4.0)

我更新了很多宝石，并解决了所有的依赖错误，但这个问题我似乎解决不了。

这是我的宝石档案：

source 'https://rubygems.org'
gem 'rails', '~> 5.0.0'
gem 'sqlite3'
gem 'puma', '~> 3.0'
gem 'sass-rails', '~> 5.0.5'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.2'

gem 'jquery-rails'
gem 'turbolinks', '~> 5'
gem 'jbuilder', '~> 2.5'
gem 'simple_form', '~> 3.0.2'
gem 'devise', '~> 4.2'
gem 'haml', '~> 4.0.5'


group :development, :test do
  gem 'byebug', platform: :mri
end

group :development do
  gem 'web-console'
  gem 'listen', '~> 3.0.5'
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

我的宝石档案里有什么东西能解决这个问题吗？很抱歉，如果没有很好的解释，我是个新手(并且花了几个小时试图自己解决这个问题！)

Answer 1

在Gemfile和Error中有很多关于依赖关系的信息。

铁路(= 5.0.0)被解析为5.0.0，这取决于actionpack (= 5.0.0) simple_form (~> 3.0.2)被解析为3.0.2，这取决于actionpack (~> 4.0)

~> --这将版本限制为可能版本的子集。Read about it.

因此，从错误您可以读取，simple_form依赖于actionpack，这只能是从4.0到4.1版本。但是railties至少依赖于actionpack版本5.0。

要解决此问题，必须更新simple_form gem。例如，3.2.1版本有下一个actionpack规范

s.add_dependency('actionpack', '> 4', '< 5.1')