捆绑包和捆绑包更新有什么区别？

Question

使用这两个命令时,我得到两个不同的结果bundle和bundle update

如果我使用bundle update,我收到以下错误:

Resolving dependencies...
Bundler could not find compatible versions for gem "railties":
  In Gemfile:
    requirejs-rails (>= 0) ruby depends on
      railties (~> 3.1.1) ruby

    rails (= 4.0.0.rc2) ruby depends on
      railties (4.0.0.rc2)

Bundler could not find compatible versions for gem "rails":
  In Gemfile:
    requirejs-rails (>= 0) ruby depends on
      rails (~> 3.1.1) ruby

    rails (4.0.0.rc2)

但如果我只使用bundle,我得到以下内容:

Resolving dependencies...
Bundler could not find compatible versions for gem "activesupport":
  In snapshot (Gemfile.lock):
    activesupport (3.2.2)

  In Gemfile:
    rails (= 4.0.0.rc2) ruby depends on
      activesupport (= 4.0.0.rc2) ruby

Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.

这些错误指向两个不同dependencie问题,但两者的命令是fetching gem metadata from https://rubygems.org/...和Resolving dependencies...,因此他们如何不同？

我一直使用bundle,但尝试bundle update并注意到差异.

Answer 1

简而言之:bundle install处理对Gemfile的更改,并捆绑更新升级已由Bundler管理的gem.

http://viget.com/extend/bundler-best-practices

不用说,bundle并且bundle install是相同的命令,install是默认选项bundle.

Answer 2

bundle是相同的bundle install,它执行以下操作:

• 检查是否Gemfile.lock存在.如果是,请安装所有具有指定版本的宝石.
• 如果锁不存在,请Gemfile使用最新的可用/允许版本按照指定安装gems Gemfile.然后创建Gemfile.lock以记录已安装的版本.

bundle update另一方面,删除/忽略你的Gemfile.lock,直接进入第二步.

您看到的错误可能是因为某些gem想要active_support在3.x.x版本范围内,而您似乎正在尝试升级到Rails 4.