Ruby on rails Heroku bundler未定义方法“；现在；，无法通过bundler安装gems

尝试将rails应用程序推送到Heroku时遇到奇怪的错误：

    remote: -----> Building on the Heroku-20 stack
    remote: -----> Using buildpack: heroku/ruby
    remote: -----> Ruby app detected
    remote: -----> Installing bundler 2.2.16
    remote: -----> Removing BUNDLED WITH version in the Gemfile.lock
    remote: -----> Compiling Ruby/Rails
    remote: -----> Using Ruby version: ruby-3.0.1
    remote: -----> Installing dependencies using bundler 2.2.16
    remote:        Running: BUNDLE_WITHOUT='development:test' BUNDLE_PATH=vendor/bundle BUNDLE_BIN=vendor/bundle/bin BUNDLE_DEPLOYMENT=1 bundle install -j4
    remote:        /tmp/build_ae8e646d/bin/bundle:42:in `gemfile': undefined method `present?' for "/tmp/build_ae8e646d/Gemfile":String (NoMethodError)
    remote:        Did you mean?  prepend
    remote:         from /tmp/build_ae8e646d/bin/bundle:49:in `lockfile'
    remote:         from /tmp/build_ae8e646d/bin/bundle:57:in `lockfile_version'
    remote:         from /tmp/build_ae8e646d/bin/bundle:68:in `bundler_version'
    remote:         from /tmp/build_ae8e646d/bin/bundle:72:in `bundler_requirement'
    remote:         from /tmp/build_ae8e646d/bin/bundle:100:in `activate_bundler'
    remote:         from /tmp/build_ae8e646d/bin/bundle:88:in `load_bundler!'
    remote:         from /tmp/build_ae8e646d/bin/bundle:116:in `<main>'
    remote:        Bundler Output: /tmp/build_ae8e646d/bin/bundle:42:in `gemfile': undefined method `present?' for "/tmp/build_ae8e646d/Gemfile":String (NoMethodError)
    remote:        Did you mean?  prepend
    remote:         from /tmp/build_ae8e646d/bin/bundle:49:in `lockfile'
    remote:         from /tmp/build_ae8e646d/bin/bundle:57:in `lockfile_version'
    remote:         from /tmp/build_ae8e646d/bin/bundle:68:in `bundler_version'
    remote:         from /tmp/build_ae8e646d/bin/bundle:72:in `bundler_requirement'
    remote:         from /tmp/build_ae8e646d/bin/bundle:100:in `activate_bundler'
    remote:         from /tmp/build_ae8e646d/bin/bundle:88:in `load_bundler!'
    remote:         from /tmp/build_ae8e646d/bin/bundle:116:in `<main>'
    remote: 
    remote:  !
    remote:  !     Failed to install gems via Bundler.
    remote:  !
    remote:  !     Push rejected, failed to compile Ruby app.

remote:------>在Heroku-20堆栈上构建
远程：-->使用buildpack:heroku/ruby
远程：-->检测到Ruby应用程序
远程：-->安装捆绑机2.2.16
远程：-->删除Gemfile.lock中的捆绑版本
远程：-->编译Ruby/Rails
远程：-->使用Ruby版本：Ruby-3.0.1
远程：-->使用bundler 2.2.16安装依赖项
远程：正在运行：BUNDLE\u而不使用='development:test'BUNDLE\u PATH=vendor/BUNDLE BUNDLE\u BIN=vendor/BUNDLE/BIN BUNDLE\u部署=1 BUNDLE安装-j4
远程：/tmp/build\u ae8e646d/bin/bundle:42:“gemfile”中：未定义“/tmp/build\u ae8e646d/gemfile”的方法“present”：字符串（NoMethodError）
遥控器：你是说？预编
远程：from/tmp/build_ae8e646d/bin/bundle:49:在“锁文件”中
远程：从/tmp/build_ae8e646d/bin/bundle:57:“锁定文件”版本中
远程：from/tmp/build_ae8e646d/bin/bundle:68:in'bundler_version'
远程：from/tmp/build_ae8e646d/bin/bundle:72:在“bundler_requirement”中
远程：从/tmp/build_ae8e646d/bin/bundle:100:“激活绑定器”中
远程：from/tmp/build_ae8e646d/bin/bundle:88:in'load_bundler！'
远程：from/tmp/build\u ae8e646d/bin/bundle:116:in`'
远程：绑定器输出：/tmp/build\u ae8e646d/bin/bundle:42:“gemfile”中：未定义“/tmp/build\u ae8e646d/gemfile”的方法“present”：字符串（命名错误）
遥控器：你是说？预编
远程：from/tmp/build_ae8e646d/bin/bundle:49:在“锁文件”中
远程：从/tmp/build_ae8e646d/bin/bundle:57:“锁定文件”版本中
远程：from/tmp/build_ae8e646d/bin/bundle:68:in'bundler_version'
远程：from/tmp/build_ae8e646d/bin/bundle:72:在“bundler_requirement”中
远程：从/tmp/build_ae8e646d/bin/bundle:100:“激活绑定器”中
远程：from/tmp/build_ae8e646d/bin/bundle:88:in'load_bundler！'
远程：from/tmp/build\u ae8e646d/bin/bundle:116:in`'
远程：
遥控器：！
遥控器：！无法通过捆绑程序安装gems。
遥控器：！
遥控器：！推送被拒绝，无法编译Ruby应用程序。

在此之前，我已经在Heroku上部署了一个应用程序框架，一切都很顺利。但经过一段时间的工作和推动的变化，错误出现了

---

已经尝试重新生成Gemlock.file和bundle更新，但没有成功。在当地，一切正常。Ruby和bundler版本在本地和Heroku上都是相同的。现在，我一点也不知道那会是什么。有人遇到过这样的错误吗？

找到了解决方案。问题是rubocop将/bin/bundle文件中的42行修改为

返回gemfile if gemfile.present？

，从而避免了错误。如果gemfile&&，我只是将其恢复为

return gemfile的初始状态！gemfile.empty？

一切正常。希望，这将帮助某人