Heroku sieht nicht gem 'pg'

Question

Benötigen Sie Hilfe.

Wenn ich versuche, user@X220:~/rails_projects/sample_app$ heroku run rake db:migrate

Es ist ein Fehler zu machen:

Running rake db:migrate on limitless-fjord-69900.... up, run.2816 rake aborted!
Gem::LoadError: Specified 'postgresql' for database adapter, but the gem is not loaded.
Add gem 'pg' to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.6/lib/active_record/connection_adapters/connection_specification.rb:177:in rescue in spec' /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.6/lib/active_record/connection_adapters/connection_specification.rb:174:in spec' /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.6/lib/active_record/connection_handling.rb:50:in establish_connection' /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.6/lib/active_record/railtie.rb:120:in block (2 levels) in ' /app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.6/lib/active_support/lazy_load_hooks.rb:38:in instance_eval' /app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.6/lib/active_support/lazy_load_hooks.rb:38:in execute_hook' /app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.6/lib/active_support/lazy_load_hooks.rb:45:in block in run_load_hooks' /app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.6/lib/active_support/lazy_load_hooks.rb:44:in each' /app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.6/lib/active_support/lazy_load_hooks.rb:44:in run_load_hooks' /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.6/lib/active_record/base.rb:315:in ' /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.6/lib/active_record/base.rb:26:in <top (required)>' /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.6/lib/active_record/tasks/mysql_database_tasks.rb:8:in ' . . .
Tasks: TOP => db:migrate => db:load_config (See full trace by running task with --trace)

Mein Gemfile ist:

'source 'https://rubygems.org' 
ruby '2.2.0' 
gem 'activerecord', '~> 4.2', '>= 4.2.6' 
gem 'rails', '4.2.6' 
group :development, :test do 
    gem 'byebug' 
    gem 'sqlite3', '~> 1.3', '>= 1.3.11' 
    gem 'rspec-rails', '~> 2.8' 
end 
group :test do 
    gem 'selenium-webdriver', '2.35.1' 
    gem 'capybara', '2.1.0' 
end 
gem 'sass-rails', '~> 5.0' 
gem 'uglifier', '>= 1.3.0' 
gem 'coffee-rails', '~> 4.1.0' 
gem 'therubyracer', platforms: :ruby 
gem 'jquery-rails' 
gem 'turbolinks' 
gem 'jbuilder', '~> 2.0' 
group :doc do 
    gem 'sdoc', '~> 0.4.0', require: false 
end 
gem 'unicorn' 
group :development do 
    gem 'web-console', '~> 2.0' 
    gem 'spring' 
end 
group :production do 
    gem 'rails_12factor' 
    gem 'pg' 
end 

Was ist los?

Answer 1

Entfernen oder kommentieren gem 'sqlite3' von Ihrem Gemfile auch wenn es in development Gruppe. Ich weiß nicht warum, aber Heroku führt Ihre Anwendung nicht aus, wenn sie sqlite Edelstein außerhalb der Produktion enthält.

Wenn Sie SQLite in der Entwicklung verwenden, müssen Sie jedes Mal, wenn Sie nach Heroku bereitstellen und nach der Bereitstellung auskommentieren, gem 'sqlite' kommentieren.
Besserer Weg wird Postgres in Entwicklung sein.

Answer 2

Wie bereits erwähnt, könnte dies mit Ihrem sqlite Juwel zu tun haben.

Wenn Sie weiterhin sqlite verwenden möchten, können Sie festlegen, dass diese Gruppe ignoriert wird. Von Heroku docs:

To specify groups of gems to not to be installed, you can use the BUNDLE_WITHOUT config var.

$ heroku config:set BUNDLE_WITHOUT="development:test"