Heroku 部署错误：没有要插入的中间件：ActiveRecord::Migration::CheckPending (RuntimeError)答案

【问题标题】：Heroku deploy error: No such middleware to insert after: ActiveRecord::Migration::CheckPending (RuntimeError)Heroku 部署错误：没有要插入的中间件：ActiveRecord::Migration::CheckPending (RuntimeError)
【发布时间】：2021-04-03 18:06:16
【问题描述】：

我的 rails api 应用程序在本地运行良好，但应用程序在部署到 heroku 时崩溃。应用成功推送到heroku，但出现“Detecting rails configuration failed”警告，通过运行“heroku run rails console”启动heroku控制台显示以下错误：

        10: from /app/vendor/bundle/ruby/2.6.0/gems/railties-6.1.3.1/lib/rails/initializable.rb:32:in `instance_exec'
         9: from /app/vendor/bundle/ruby/2.6.0/gems/railties-6.1.3.1/lib/rails/application/finisher.rb:108:in `block in <module:Finisher>'
         8: from /app/vendor/bundle/ruby/2.6.0/gems/railties-6.1.3.1/lib/rails/engine.rb:521:in `app'
         7: from /app/vendor/bundle/ruby/2.6.0/gems/railties-6.1.3.1/lib/rails/engine.rb:521:in `synchronize'
         6: from /app/vendor/bundle/ruby/2.6.0/gems/railties-6.1.3.1/lib/rails/engine.rb:524:in `block in app'
         5: from /app/vendor/bundle/ruby/2.6.0/gems/railties-6.1.3.1/lib/rails/configuration.rb:94:in `merge_into'
         4: from /app/vendor/bundle/ruby/2.6.0/gems/railties-6.1.3.1/lib/rails/configuration.rb:94:in `each'
         3: from /app/vendor/bundle/ruby/2.6.0/gems/railties-6.1.3.1/lib/rails/configuration.rb:95:in `block in merge_into'
         2: from /app/vendor/bundle/ruby/2.6.0/gems/railties-6.1.3.1/lib/rails/configuration.rb:60:in `block in insert_after'
         1: from /app/vendor/bundle/ruby/2.6.0/gems/actionpack-6.1.3.1/lib/action_dispatch/middleware/stack.rb:109:in `insert_after'
/app/vendor/bundle/ruby/2.6.0/gems/actionpack-6.1.3.1/lib/action_dispatch/middleware/stack.rb:162:in `assert_index': No such middleware to insert after: ActiveRecord::Migration::CheckPending (RuntimeError)

我试过了：

卸载 gems
在 config/environments/production.rb 中将 config.public_file_server.enabled 设置为 true
更新 ruby 和 rails 并捆绑更新我的 gems

【问题讨论】：

标签： ruby-on-rails heroku activerecord

【解决方案1】：

想通了。设置omniauth时，我在application.rb中留下了一行代码：

config.middleware.insert_after ActiveRecord::Migration::CheckPending, ActionDispatch::Cookies

删除它解决了问题:)

【讨论】：