升级到Rails4.2问题-UpgradingtoRails4.2issues

8  

The OP's issue (and mine) was to do with an incompatibility in the prototype-rails gem. This can be fixed by using the "4.2" branch of prototype-rails directly from github. Modify your Gemfile entry as follows:

OP的问题（以及我的问题）与prototype-rails gem中的不兼容性有关。这可以通过直接从github使用prototype-rails的“4.2”分支来解决。修改您的Gemfile条目，如下所示：

gem 'prototype-rails', github: 'rails/prototype-rails', branch: '4.2'

Note that the prototype-rails gem will not be supported from Rails 5 onwards, so now would be as good a time as any to remove this dependency.

请注意，从Rails 5开始不支持prototype-rails gem，因此现在可以像删除此依赖项一样好。

3  

I believe they removed html-scanner from rails in 4.2 when they switched to rails-html-sanitizer according to the upgrade guide but it seems you can use the rails-deprecated_sanitizer gem to your Gemfile to then re-include the html-scanner library

我相信他们根据升级指南切换到rails-html-sanitizer时会从4.2中删除html-scanner但是看起来你可以使用rails-deprecated_sanitizer gem到你的Gemfile然后重新包含html-scanner库

gem 'rails-deprecated_sanitizer'

Hope this helps!

希望这可以帮助！