為何要修改Gemfile文件才能上傳Heroku請參考以下
SQLite stores data in a file. Heroku doesn't allow storing user's file so you can't use SQLite with Heroku. Instead you should to switch to another database like PostgreSQL or MySQL. Here you can find details.
If you already have an app that was created without specifying --database=postgresql you will need to add the pg gem to your Rails project. Edit your Gemfile and change this line:
把 sqlite3 To -> group :development, :test do
Ex:
group :development, :test do
gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
gem 'sqlite3'
end
在新增PostgreSQL (pg) 在Rails 版本5以上請用以下安裝
gem 'pg', '~> 0.18'
# Rails < 5請用以下安裝
gem 'pg', '~> 0.11'
group :production do
gem 'rails_12factor'
end
開始進行上傳Heroku動作，登入以及創建一個app在雲上
heroku login
heroku create
輸入
git push heroku master(換成你要放上雲端的最新要件)
執行數據庫的上載heroku run rake db:migrate。
失敗原因: 首先如果上傳的檔案在雲上沒有導致上傳失誤
輸入查看有哪些
git remote -v
基本上會有兩個
origin https://github.com/Name/xxxx.git (fetch)
origin https://github.com/Name/sssss.git (push)
檢查檔案名稱是否有誤
heroku https://git.heroku.com/rocky-depths-123.git (fetch)
heroku https://git.heroku.com/rocky-depths-123.git (push)
刪除目前heroku狀態 刪除完畢再輸入git remote -v 檢查是否還存在
git remote rm heroku
如出現Build failed – check your build logs之類相關問題有可能是
buildpack 尚未安裝
Check your buildpack檢查 heroku buildpacks 如出現無資料相關資訊請輸入以下
heroku buildpacks:set heroku/nodejs
如果heroku run rake db:migrate
發生下面這種錯誤
Gem::LoadError can't activate pg (~> 0.18), already activated pg-1.0.0. Make sure all dependencies are added to Gemfile.
請修改Gemfile
# 在Rails 版本5以上請用以下安裝
gem 'pg', '~> 0.18'
# Rails < 5請用以下安裝
gem 'pg', '~> 0.11'
group :production do
gem 'rails_12factor'
end
執行更新動作bundle update pg。
再來請在git commit 在 試一次 heroku run rake db:migrate
完成後再次上傳看看
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