Rake db:migrate 错误请安装 sqlite3 适配器：`gem install activerecord-sqlite3-adapter`答案

【问题标题】：Rake db:migrate error Please install the sqlite3 adapter: `gem install activerecord-sqlite3-adapter`Rake db:migrate 错误请安装 sqlite3 适配器：`gem install activerecord-sqlite3-adapter`
【发布时间】：2013-06-03 03:37:20
【问题描述】：

简报：上周我一直在尝试将我的博客部署到 heroku，但没有成功。我已经联系了 Heroku 支持，他们几乎告诉我在 stackoverflow 上发布日志。所以我在这里。

我很确定它与 postgreSQL 有关，但我可能错了。无论如何，这是代码库：www.github.com/apane/blogit_blog。

Heroku 日志如下。

Gemfile 提供了很好的衡量标准：

source 'https://rubygems.org'

gem 'rails', '3.2.13'

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

gem 'blogit', '0.8.0'

gem "will_paginate", "~> 3.0.4"

gem 'devise'

# Gems used only for assets and not required
# in production environments by default.

group :production do
  gem 'pg'
  gem "unicorn", "~> 4.6.2"

end
group :development, :test do
  gem 'pg'
  gem "unicorn", "~> 4.6.2"

end

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', :platforms => :ruby

  gem 'uglifier', '>= 1.0.3'  
end

gem 'jquery-rails'

Rake db:migrate 错误日志：

    rake aborted!
Please install the sqlite3 adapter: `gem install activerecord-sqlite3-adapter` (sqlite3 is not part of the bundle. Add it to Gemfile.)
/usr/local/rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/rubygems_integration.rb:147:in `block in replace_gem'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/sqlite3_adapter.rb:3:in `<top (required)>'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:50:in `resolve_hash_connection'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:41:in `resolve_string_connection'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:25:in `spec'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:130:in `establish_connection'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/railtie.rb:82:in `block (2 levels) in <class:Railtie>'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:26:in `block in on_load'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:25:in `each'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:25:in `on_load'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/railtie.rb:74:in `block in <class:Railtie>'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `instance_exec'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `run'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/initializable.rb:55:in `block in run_initializers'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `each'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `run_initializers'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/application.rb:136:in `initialize!'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/railtie/configurable.rb:30:in `method_missing'
/Users/anthonypanepinto/Sites/personal_blog/personal_blog/config/environment.rb:5:in `<top (required)>'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/application.rb:103:in `require_environment!'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/application.rb:297:in `block (2 levels) in initialize_tasks'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/task.rb:246:in `call'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/task.rb:246:in `block in execute'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/task.rb:241:in `each'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/task.rb:241:in `execute'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/task.rb:184:in `block in invoke_with_call_chain'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/task.rb:205:in `block in invoke_prerequisites'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/task.rb:203:in `each'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/task.rb:203:in `invoke_prerequisites'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/task.rb:183:in `block in invoke_with_call_chain'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/task.rb:170:in `invoke'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/application.rb:143:in `invoke_task'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/application.rb:101:in `block (2 levels) in top_level'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/application.rb:101:in `each'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/application.rb:101:in `block in top_level'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/application.rb:110:in `run_with_threads'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/application.rb:95:in `top_level'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/application.rb:73:in `block in run'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.4/lib/rake/application.rb:70:in `run'
Tasks: TOP => db:migrate => environment
(See full trace by running task with --trace)

【问题讨论】：

上周我遇到了这个问题。我的问题出在 Gemfile 中——必须注释掉对“sqlite3”的引用。我在您的中没有看到它，并且您的 pg gem 看起来是正确的-您在部署之前捆绑了吗？此外，检查您的 database.yml，它已预先设置为使用 sqlite3 作为适配器。 Sqlite3 必须被注释掉并添加 postgresql。（希望这不是太基础，我自己也是初学者。）
3 个没有投票或 cmets 的答案。这里有什么帮助你吗？我遇到了类似的问题（同样的错误，但 Heroku 没有）

标签： ruby-on-rails ruby ruby-on-rails-3 heroku dbmigrate

【解决方案1】：

看起来您可能正在开发中使用 sqlite。

你可以在你的 gemfile 中尝试这个而不是你拥有的吗？

group :development, :test do
  gem 'sqlite3'
  gem "unicorn", "~> 4.6.2"

end

然后通常的捆绑安装并再次运行迁移。

【讨论】：

我遇到了同样的错误，但我的 Gemfile 已经在 dev/test 组中使用 sqlite3 以这种方式构建

【解决方案2】：

错误Please install the sqlite3 adapter: 'gem install activerecord-sqlite3-adapter' 表示您的本地环境已配置为运行 SQLite，但未安装 SQLite。该消息引用了activerecord-sqlite3-adapter gem，但是在您的 Gemfile 中，在一个完全集成的 Rails 环境中，您只需要为您想要运行的环境捆绑sqlite3（可能是开发和测试，因为您的生产正在进行Heroku，它使用 Postgres）。

将 Gemfile 中的 group :development, test 块替换为以下内容：

group :development, :test do
  gem 'sqlite3'
  gem "unicorn", "~> 4.6.2"
end

【讨论】：

【解决方案3】：

请记住，Heroku 使用配置属性 DATABASE_URL 而不是您的 database.yml 文件来连接到您的数据库。确保已设置。

heroku 配置：设置 DATABASE_URL=sqlite3://bb06ca765fb123:71b6dabc@us-cdbr-east-04.cleardb.com/heroku_703eded6aebc123?reconnect=true

【讨论】：