ruby-on-rails - Gem::LoadError:尝试在 Heroku 上部署时 - Rails 4

Question

我正在尝试将一个应用程序(只是 Rails 教程中的一个简单应用程序)部署到 Heroku，但它一直给我相同的错误消息。我使用命令:

git push heroku master

一开始好好的，然后突然出现这个错误:

-----> Preparing app for Rails asset pipeline
       Running: rake assets:precompile
       rake aborted!
       Gem::LoadError: Specified 'sqlite3' for database adapter, but the gem is not loaded. Add `gem 'sqlite3'` to your Gemfile.

我已经进行了捆绑安装，一切都很顺利。

这是我的 Gemfile:

# Use sqlite3 as the database for Active Record
gem 'sqlite3'

也许我在 databse.yml 文件中遗漏了一些东西？

#   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

顺便说一句，我不知道这是否有帮助，但我使用的是 Rails 4.0.4、Ruby 2.1.1 和 Mac 上已安装的 SQLite 版本，即 3.7.13

Answer 1

Kirti 说得对，Heroku 不支持 sqlite 作为适配器，

执行以下操作

在 Gemfile 中:

group :production, :staging do
  gem 'pg'
end

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

在database.yml

production:
  adapter: postgresql
  database: name_of_your_db
  pool: 5
  timeout: 5000