运行heroku run rake db：migrate时出错

Question

我正在浏览Railstutorial并在运行heroku run rake db:migrate时出现错误

我已经在网上搜索了几个小时 - 这个错误似乎很常见，但建议的解决方案似乎都没有任何区别，我们非常感谢您的帮助！

错误是

Connecting to database specified by DATABASE_URL
rake aborted!
Please install the postgresql adapter: `gem install activerecord-postgresql-adapter` (pg is not part of the bundle. Add it to Gemfile.)

我跑了gem install activerecord-postgresql-adapter并更改了我的gemfile，它现在看起来像这样：

group :development do
  gem 'rspec-rails', '2.6.1'
  gem 'sqlite3', '~> 1.3.0'
end

group :test do
  gem 'rspec-rails', '2.6.1'
  gem 'webrat', '0.7.1'
  gem 'sqlite3', '~> 1.3.0'
end

group :production do
   gem "pg"
end

提交后我跑了bundle install --without production和git push heroku

我的database.yml看起来像这样：

# SQLite version 3.x
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem 'sqlite3'
development:
  adapter: sqlite3
  database: db/development.sqlite3
  pool: 5
  timeout: 5000

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  adapter: sqlite3
  database: db/test.sqlite3
  pool: 5
  timeout: 5000

production:
  adapter: sqlite3
  database: db/production.sqlite3
  pool: 5
  timeout: 5000

Answer 1

运行bundle install然后推送到heroku

省略--without production，这样gemfile.lock可以用gem pg实现

Answer 2

我使用Windows系统时遇到了同样的错误。在Ubuntu虚拟机上尝试过，由于某种原因，错误消失了，因为我能够