尝试迁移数据库时出现 Heroku 弃用警告

Question

我创建了一个 Rails 3.2 应用程序，并希望将其部署在 Heroku 上。

我在 cedar 堆栈上创建了一个新会话并将我的应用推送到它。

但是，当我尝试迁移数据库时，我收到了弃用警告。

我使用--trace 命令运行了迁移命令，它给了我以下信息：

** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
rake aborted!
uninitialized constant SimpleForm
/app/config/initializers/simple_form.rb:2:in `<top (required)>'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/engine.rb:588:in `block (2 levels) in <class:Engine>'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/engine.rb:587:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/engine.rb:587:in `block in <class:Engine>'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/initializable.rb:30:in `instance_exec'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/initializable.rb:30:in `run'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/initializable.rb:55:in `block in run_initializers'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/initializable.rb:54:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/initializable.rb:54:in `run_initializers'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/application.rb:136:in `initialize!'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/railtie/configurable.rb:30:in `method_missing'
/app/config/environment.rb:5:in `<top (required)>'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/application.rb:103:in `require'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/application.rb:103:in `require_environment!'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.2/lib/rails/application.rb:292:in `block (2 levels) in initialize_tasks'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/usr/local/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:176:in `block in invoke_prerequisites'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `invoke_prerequisites'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:157:in `block in invoke_with_call_chain'
/usr/local/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/app/vendor/bundle/ruby/1.9.1/bin/rake:19:in `load'
/app/vendor/bundle/ruby/1.9.1/bin/rake:19:in `<main>'
Tasks: TOP => db:migrate => environment

我的应用在本地运行良好。

这是我的 gem 文件：

source 'https://rubygems.org'

gem 'rails', '3.2.2'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'

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

group :development, :test do
    gem 'sqlite3'
end

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'
  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  gem 'therubyracer', '~> 0.9.2'
  gem 'bootstrap-sass'
  gem 'uglifier', '>= 1.0.3'
  gem 'twitter-bootstrap-rails', '2.0.2'
  gem 'simple_form'
  gem 'fog'
end

gem 'jquery-rails'

# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'

# To use Jbuilder templates for JSON
# gem 'jbuilder'

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

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger
# gem 'ruby-debug19', :require => 'ruby-debug'

Answer 1

将 simple_form gem 移到您的 :assets 组之外 - 我的位于 jquery-rails gem 引用下，然后确保在推送到 heroku 之前在控制台中本地运行此命令：

RAILS_ENV=production bundle exec rake assets:precompile

希望有帮助！