Ruby on Rails应用程序已部署到heroku，但是应用程序出错？

Question

每个人实际上我对ROR都是陌生的，并且在调试，特别是阅读和理解Heroku日志方面都感到很挣扎

我将Cloud 9用作开发的工具

我做了一个基本的笔记应用程序，构建成功后我将其部署到了Heroku，但是当我打开应用程序链接时，它显示应用程序错误

有人可以帮我吗，谢谢！

Ruby版本

ruby 2.3.4p301 (2017-03-30 revision 58214) [x86_64-linux]

Rails版本

Rails 4.2.5

的Gemfile

  source 'https://rubygems.org'

  ruby '2.5.1'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.5'
# Use sqlite3 as the database for Active Record

# Use SCSS for stylesheets
gem 'bootstrap-sass', '~> 3.3.7'
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

group :development, :test do
  gem 'sqlite3'
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug'
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console', '~> 2.0'

  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
end

group :production do
  gem 'pg'
  gem 'rails_12factor'
end

Heroku原木-n 300

https://drive.google.com/file/d/1-evm_rnjGHiblHGckLmGwGcmOv5yBd6-/view?usp=sharing

Answer 1

多谢你们 ！ 有时解决方案确实很简单，但却无法感知。 我只是通过在小组生产中添加pg gem的版本[gem'pg'，'〜> 0.20']解决了该问题