我已经开始学习Ruby on Rails，并且我已经学习了很多指南，因此我使用了许多版本的Ruby，我的Windows 7 64位机器。目前我安装了Ruby 2.3，我也用于入门指南Getting started with Rails。让Heroku成为我的生产之源。我已经完成了Getting started on Heroku with Ruby(Windows) 这也让我安装了JRuby 9.1.8。我在指南后取得了巨大的成功。我可以在本地和Heroku上测试我的应用程序。 在使用文档的同时，我想在这里用Aptana v3做一个真实的东西并创建一个将部署在Heroku上的应用程序，我需要运行我的PostgreSQL服务器，我安装了企业版9.3。我测试了它，我工作正常。 现在我应该能够为heroku创建我的第一个项目，我找到了Using Rails, Aptana, PostgreSQL, and Heroku Seamlessly的另一个指南 在我试图创建postgres数据库的过程中遇到的问题。 我决定概述为使事情清楚而采取的所有步骤。
当我运行此命令时:) rails new readlyme-test-perfect -d postgresql 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
我收到了这个错误：
$ 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。
答案 0 :(得分：1)
在运行此rails new readlyme-test-perfect -d postgresq之前，您确定安装了postgresql gem吗？尝试重新安装。
gem uninstall pg
gem install pg
答案 1 :(得分：1)
在经历了很多类似的问题及其答案后，我意识到我的问题的原因来自Ruby安装。虽然我正在关注Rails和Heroku的官方文档但是运行JRuby 9.1.8.I和Ruby2.3并不是一个好的文档。使用Ruby2.3和Devkit，我能够安装rails并可以方便地使用slite3和mysql适配器。我不知道它也将用于postgresql。当我安装JRuby时，它会覆盖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。
要解决这个问题，我只需卸载JRuby，将其从环境变量中删除，在系统重启后，我安装rails并使用以下命令创建一个rails项目：rails new readlyme-test-perfect -d postgresql < / strong>每件事都像魅力一样。 现在借助这个Heroku Docs我已经将我的应用程序部署在heroku中，迁移我的数据库，现在可以方便地从Aptana3编码。
非常感谢所有贡献者。
答案 2 :(得分：0)
对于那些想留在JRuby（OP显然切换回C Ruby）的人，我能够通过在我的Gemfile中强制使用旧版本来实现这一点：
gem "activerecord-jdbcpostgresql-adapter", "1.3.24", :platform => :jruby
自动下拉的版本＆gt; = 50.0与其他依赖项的版本冲突（如Rails 4.2.8）