如何从SQLite3切换到Postgres以在Heroku上部署
我的初始数据库是SQLite 3，但是heroku不支持它，我必须切换到PostgreSQL。 我试图在gemfile中使用gem，但部署仍然失败。
这是我的gemfile：
source 'https://rubygems.org' gem 'postgres', '~> 0.8.1' group :development, :test do gem 'sqlite3' end 部署日志中的摘录显示失败的内容：
... Bundled gems are installed into ./vendor/bundle. remote: Post-install message from rdoc: remote: Depending on your version of ruby, you may need to install ruby rdoc/ri data: remote: = 1.9.2 : nothing to do! Yay! remote: Post-install message from haml: remote: HEADS UP! Haml 4.0 has many improvements, but also has changes that may break remote: your application: remote: * Support for Ruby 1.8.6 dropped remote: * Support for Rails 2 dropped remote: * Sass filter now always outputs tags remote: * Data attributes are now hyphenated, not underscored remote: * html2haml utility moved to the html2haml gem remote: * Textile and Maruku filters moved to the haml-contrib gem remote: For more info see: remote: http://rubydoc.info/github/haml/haml/file/CHANGELOG.md remote: Post-install message from compass: remote: Compass is charityware. If you love it, please donate on our behalf at http://umdf.org/compass Thanks! remote: Post-install message from postgres: remote: --------------------------------------------------------------------------- remote: This is an old, deprecated version of the Ruby PostgreSQL driver that hasn't remote: been maintained or supported since early 2008. remote: You should install/require 'pg' instead. remote: If you need the 'postgres' gem for legacy code that can't be converted, you can remote: still install it using an explicit version, like so: remote: gem install postgres -v '0.7.9.2008.01.28' remote: gem uninstall postgres -v '>0.7.9.2008.01.28' remote: If you have any questions, the nice folks in the Google group can help: remote: --------------------------------------------------------------------------- remote: Post-install message from paperclip: remote: ################################################## remote: # NOTE FOR UPGRADING FROM 4.3.0 OR EARLIER # remote: ################################################## remote: Paperclip is now compatible with aws-sdk >= 2.0.0. remote: If you are using S3 storage, aws-sdk >= 2.0.0 requires you to make a few small remote: changes: remote: * You must set the `s3_region` remote: * If you are explicitly setting permissions anywhere, such as in an initializer, remote: note that the format of the permissions changed from using an underscore to remote: using a hyphen. For example, `:public_read` needs to be changed to remote: `public-read`. remote: For a walkthrough of upgrading from 4 to 5 and aws-sdk >= 2.0 you can watch remote: http://rubythursday.com/episodes/ruby-snack-27-upgrade-paperclip-and-aws-sdk-in-prep-for-rails-5 remote: Post-install message from twitter-bootstrap-rails: remote: Important: You may need to add a javascript runtime to your Gemfile in order for bootstrap's LESS files to compile to CSS. remote: ********************************************** remote: ExecJS supports these runtimes: remote: therubyracer - Google V8 embedded within Ruby remote: therubyrhino - Mozilla Rhino embedded within JRuby remote: Node.js remote: Apple JavaScriptCore - Included with Mac OS X remote: Microsoft Windows Script Host (JScript) remote: ********************************************** remote: Bundle completed (47.33s) remote: Cleaning up the bundler cache. remote: sh: 1: $: not found remote: sh: 1: $: not found remote: ! remote: ! Could not detect rake tasks remote: ! ensure you can run `$ bundle exec rake -P` against your app remote: ! and using the production group of your Gemfile. remote: ! This is an old, deprecated version of the Ruby PostgreSQL driver that hasn't remote: ! been maintained or supported since early 2008. remote: ! remote: ! You should install/require 'pg' instead. remote: ! remote: ! If you need the 'postgres' gem for legacy code that can't be converted, you can remote: ! still install it using an explicit version, like so: remote: ! remote: ! gem install postgres -v '0.7.9.2008.01.28' remote: ! gem uninstall postgres -v '>0.7.9.2008.01.28' remote: ! remote: ! If you have any questions, the nice folks in the Google group can help: remote: ! remote: ! remote: /app/tmp/buildpacks/f6d48d8a14fccbb19c0c0402fca224929d18e9ee042b3e204bc5992612e990d3b3a0fb1f9627b1a3bae11e9fa20dffc96e136bd734a2f3cf92a0d05bedd42cfe/lib/language_pack/helpers/rake_runner.rb:102:in `load_rake_tasks!': Could not detect rake tasks (LanguagePack::Helpers::RakeRunner::CannotLoadRakefileError) remote: ensure you can run `$ bundle exec rake -P` against your app remote: and using the production group of your Gemfile. remote: This is an old, deprecated version of the Ruby PostgreSQL driver that hasn't remote: been maintained or supported since early 2008. remote: remote: You should install/require 'pg' instead. remote: remote: If you need the 'postgres' gem for legacy code that can't be converted, you can remote: still install it using an explicit version, like so: remote: remote: gem install postgres -v '0.7.9.2008.01.28' remote: gem uninstall postgres -v '>0.7.9.2008.01.28' ... remote: ! Push rejected, failed to compile Ruby app. remote: remote: ! Push failed remote: Verifying deploy... remote: remote: ! Push rejected to git_name_repo. remote: To https://git.heroku.com/git_name_repo.git ! [remote rejected] master -> master (pre-receive hook declined)
只需在Gemfile中执行此操作即可
group :production do gem 'pg' gem 'rails_12factor' end
并将你的sqlite3 gem转移到
group :development, :test do gem 'sqlite3' end
运行bundle install --without production ，你应该很高兴去