rake中止！active_record/connection_adapters/postgresql/explain_pretty_printer :没有要加载的此类文件-- LoadError

Question

我已经开始学习Ruby on Rails，并且我遵循了许多指南，因此我在我的Windows7 64位机器上使用过许多版本的Ruby。目前，我已经安装了Ruby2.3，我也将其用于入门指南Getting started with Rails。让Heroku我的想法是为了生产。我已经通过他们的Getting started on Heroku with Ruby(Windows) 完成了工作，这也让我安装了JRuby 9.1.8。我在指南中获得了巨大的成功。我可以在本地和Heroku上测试我的应用程序。有了这些文档，我想在这里用Aptana v3做一个真实的事情，创建一个部署在Heroku上的应用程序，我需要有我的PostgreSQL服务器运行，我已经安装了企业版本9.3。我对它进行了测试，并且工作正常。现在我应该能够为heroku创建我的第一个项目了，我找到了另一个Using Rails, Aptana, PostgreSQL, and Heroku Seamlessly指南，我在尝试创建postgres数据库时遇到了困难。我决定概述一下为把事情弄清楚而采取的所有步骤。

当我运行这个命令：) rails new readlyme-test-perfect -d postgresql时，我得到了以下输出：

Expected string default value for '--rc'; got false (boolean)
  create
  create  README.rdoc
  create  Rakefile
  create  config.ru
  create  .gitignore
  create  Gemfile
  create  app
  create  app/assets/javascripts/application.js
  create  app/assets/stylesheets/application.css
  create  app/controllers/application_controller.rb
  create  app/helpers/application_helper.rb
  create  app/views/layouts/application.html.erb
  create  app/assets/images/.keep
  create  app/mailers/.keep
  create  app/models/.keep
  create  app/controllers/concerns/.keep
  create  app/models/concerns/.keep
  create  bin
  create  bin/bundle
  create  bin/rails
  create  bin/rake
  create  bin/setup
  create  config
  create  config/routes.rb
  create  config/application.rb
  create  config/environment.rb
  create  config/secrets.yml
  create  config/environments
  create  config/environments/development.rb
  create  config/environments/production.rb
  create  config/environments/test.rb
  create  config/initializers
  create  config/initializers/assets.rb
  create  config/initializers/backtrace_silencers.rb
  create  config/initializers/cookies_serializer.rb
  create  config/initializers/filter_parameter_logging.rb
  create  config/initializers/inflections.rb
  create  config/initializers/mime_types.rb
  create  config/initializers/session_store.rb
  create  config/initializers/wrap_parameters.rb
  create  config/locales
  create  config/locales/en.yml
  create  config/boot.rb
  create  config/database.yml
  create  db
  create  db/seeds.rb
  create  lib
  create  lib/tasks
  create  lib/tasks/.keep
  create  lib/assets
  create  lib/assets/.keep
  create  log
  create  log/.keep
  create  public
  create  public/404.html
  create  public/422.html
  create  public/500.html
  create  public/favicon.ico
  create  public/robots.txt
  create  test/fixtures
  create  test/fixtures/.keep
  create  test/controllers
  create  test/controllers/.keep
  create  test/mailers
  create  test/mailers/.keep
  create  test/models
  create  test/models/.keep
  create  test/helpers
  create  test/helpers/.keep
  create  test/integration
  create  test/integration/.keep
  create  test/test_helper.rb
  create  tmp/cache
  create  tmp/cache/assets
  create  vendor/assets/javascripts
  create  vendor/assets/javascripts/.keep
  create  vendor/assets/stylesheets
  create  vendor/assets/stylesheets/.keep
     run  bundle install

  Fetching gem metadata from https://rubygems.org/...........
  Fetching gem metadata from https://rubygems.org/..

  Resolving dependencies...............................................................................................

  Fetching rake 12.3.1
  Installing rake 12.3.1
  Fetching concurrent-ruby 1.0.5 (java)
  Installing concurrent-ruby 1.0.5 (java)
  Fetching i18n 0.9.5
  Installing i18n 0.9.5
  Using json 1.8.6 (java)
  Fetching minitest 5.11.3
  Installing minitest 5.11.3
  Using thread_safe 0.3.6 (java)
  Fetching tzinfo 1.2.5
  Installing tzinfo 1.2.5
  Using activesupport 4.2.4
  Using builder 3.2.3
  Using erubis 2.7.0
  Fetching nokogiri 1.8.2 (java)
  Installing nokogiri 1.8.2 (java)
  Using rails-deprecated_sanitizer 1.0.3
  Fetching rails-dom-testing 1.0.9
  Installing rails-dom-testing 1.0.9
  Fetching crass 1.0.3
  Installing crass 1.0.3
  Fetching loofah 2.2.1
  Installing loofah 2.2.1
  Using rails-html-sanitizer 1.0.3
  Using actionview 4.2.4
  Fetching rack 1.6.9
  Installing rack 1.6.9
  Using rack-test 0.6.3
  Using actionpack 4.2.4
  Fetching globalid 0.4.1
  Installing globalid 0.4.1
  Using activejob 4.2.4
  Fetching mini_mime 1.0.0
  Installing mini_mime 1.0.0
  Fetching mail 2.7.0
  Installing mail 2.7.0
  Using actionmailer 4.2.4
  Using activemodel 4.2.4
  Using arel 6.0.4
  Using activerecord 4.2.4
  Fetching activerecord-jdbc-adapter 50.0
  Installing activerecord-jdbc-adapter 50.0
  Fetching jdbc-postgres 42.1.4
  Installing jdbc-postgres 42.1.4
  Fetching activerecord-jdbcpostgresql-adapter 50.0
  Installing activerecord-jdbcpostgresql-adapter 50.0
  Using bundler 1.16.1
  Using coffee-script-source 1.12.2
  Using execjs 2.7.0
  Using coffee-script 2.4.1
  Fetching thor 0.20.0
  Installing thor 0.20.0
  Using railties 4.2.4
  Fetching coffee-rails 4.1.1
  Installing coffee-rails 4.1.1
  Fetching ffi 1.9.23 (java)
  Installing ffi 1.9.23 (java)
  Fetching multi_json 1.13.1
  Installing multi_json 1.13.1
  Fetching jbuilder 2.7.0
  Installing jbuilder 2.7.0
  Using jquery-rails 4.3.1
  Fetching sprockets 3.7.1
  Installing sprockets 3.7.1
  Fetching sprockets-rails 3.2.1
  Installing sprockets-rails 3.2.1
  Using rails 4.2.4
  Fetching rb-fsevent 0.10.3
  Installing rb-fsevent 0.10.3
  Fetching rb-inotify 0.9.10
  Installing rb-inotify 0.9.10
  Using rdoc 4.3.0
  Fetching sass-listen 4.0.0
  Installing sass-listen 4.0.0
  Fetching sass 3.5.5
  Installing sass 3.5.5
  Fetching tilt 2.0.8
  Installing tilt 2.0.8
  Fetching sass-rails 5.0.7
  Installing sass-rails 5.0.7
  Using sdoc 0.4.2
  Fetching therubyrhino_jar 1.7.6
  Installing therubyrhino_jar 1.7.6
  Fetching therubyrhino 2.0.4
  Installing therubyrhino 2.0.4
  Fetching turbolinks-source 5.1.0
  Installing turbolinks-source 5.1.0
  Fetching turbolinks 5.1.0
  Installing turbolinks 5.1.0
  Fetching tzinfo-data 1.2018.3
  Installing tzinfo-data 1.2018.3
  Fetching uglifier 4.1.8
  Installing uglifier 4.1.8
  Bundle complete! 11 Gemfile dependencies, 59 gems now installed.
  Use `bundle info [gemname]` to see where a bundled gem is installed.

要创建数据库，我导航到项目文件夹，然后运行以下命令：

rake db:create:all

我得到了这个错误：

$ rake db:create:all
rake aborted!
LoadError: no such file to load -- active_record/connection_adapters/postgresql/explain_pretty_printer
C:/Users/Luke/Documents/Aptana/readlyme-test-perfect/config/application.rb:7:in `(root)'
C:/Users/Luke/Documents/Aptana/readlyme-test-perfect/rakefile:1:in `block in (root)'
C:/Users/Luke/Documents/Aptana/readlyme-test-perfect/rakefile:4:in `(root)'
(See full trace by running task with --trace)

我需要帮助。谢谢。

Answer 1

你确定在运行这个rails new readlyme-test-perfect -d postgresq之前安装了postgresql gem吗？尝试重新安装它。

gem uninstall pg
gem install pg

Answer 2

在遵循了许多类似的问题和他们的答案之后，我意识到我的问题是由Ruby安装造成的。虽然我遵循了关于Rails和Heroku的官方文档，但是运行Ruby9.1.8.i和JRuby 2.3并不是一个好的选择。使用Ruby2.3和Devkit，我可以安装rails，并且可以方便地使用slite3和mysql适配器。我几乎不知道它也会为postgresql服务。当我安装JRuby时，它覆盖了Ruby rails安装，并且可以创建一个rails项目，就像我在这里发布的问题一样。

为了解决这个问题，我简单地卸载了JRuby，将其从环境变量中删除，在系统重新启动后，我安装了rails并使用以下命令创建了一个rails项目:rails new readlyme-test-perfect -d postgresql每件事都像魅力一样工作。现在，在这个Heroku Docs的帮助下，我已经在heroku中部署了我的应用程序，迁移了我的数据库，现在可以方便地从Aptana3进行编码。

我非常感谢我所有的贡献者。

Answer 3

对于那些想继续使用JRuby的人( OP显然切换回了C Ruby)，我能够通过在我的Gemfile中强制使用一个较旧的版本来使其工作：

gem "activerecord-jdbcpostgresql-adapter", "1.3.24", :platform => :jruby

自动下拉的>= 50.0版本与其他依赖项的版本冲突(如Rails 4.2.8)