如何在我的项目中更新 Rails 的版本？ Bundler 找不到 gem "activemodel" 的兼容版本

Question

我不明白这个问题。 Bundler 说它需要 activemodel >= 4.2.0, >= 4.0, and = 5.2.1.rc1。那么为什么它不选择 5.2.1.rc1 因为它满足所有依赖关系？

gems rails、railties 等有数十个这样的错误

我正在从 Rails 4.2 升级到最新的 Rails。我注释掉了除 Ruby 和 Rails 之外的所有版本说明符。这是我的全部 Gemfile.

workspace\>bundle
Fetching gem metadata from https://rubygems.org/..............
Fetching gem metadata from https://rubygems.org/..
You have requested:
  rails ~> 5.2

The bundle currently has rails locked at 4.2.3.
Try running `bundle update rails`

If you are updating multiple gems in your Gemfile at once,
try passing them all to `bundle update`

C:\Users\Chloe\workspace\>bundle update rails
Fetching gem metadata from https://rubygems.org/..............
Fetching gem metadata from https://rubygems.org/..
Resolving dependencies........
Bundler could not find compatible versions for gem "activemodel":
  In Gemfile:
    paperclip (~> 5.0) x64-mingw32 was resolved to 5.0.0, which depends on
      activemodel (>= 4.2.0) x64-mingw32

    rails (~> 5.2) x64-mingw32 was resolved to 5.2.1.rc1, which depends on
      activemodel (= 5.2.1.rc1) x64-mingw32

    web-console (~> 2.0) x64-mingw32 was resolved to 2.3.0, which depends on
      activemodel (>= 4.0) x64-mingw32

Answer 1

首先备份您的 Gemfile.lock，然后将其删除并再次尝试 bundle install。

如何在我的项目中更新 Rails 的版本？ Bundler 找不到 gem "activemodel" 的兼容版本

How do I update the version of Rails in my project? Bundler could not find compatible versions for gem "activemodel"

ruby

rubygems

ruby-on-rails

bundler