Gem :: LoadError：指定＆＃39; mysql2＆＃39;对于数据库适配器，但未加载gem。 （Ubuntu服务器）

时间：2015-10-04 15:10:59

标签： mysql ruby-on-rails ruby ubuntu gem

我将我的ruby on rails应用程序部署到DigitalOcean Ubuntu服务器上。但我得到了这个Gem::LoadError: Specified 'mysql2' for database adapter, but the gem is not loaded.错误。

以下是完整错误：

enter image description here

这是我的Gemfile.lock： 

GEM
  remote: https://rubygems.org/
  specs:
    actionmailer (4.2.3)
      actionpack (= 4.2.3)
      actionview (= 4.2.3)
      activejob (= 4.2.3)
      mail (~> 2.5, >= 2.5.4)
      rails-dom-testing (~> 1.0, >= 1.0.5)
    actionpack (4.2.3)
      actionview (= 4.2.3)
      activesupport (= 4.2.3)
      rack (~> 1.6)
      rack-test (~> 0.6.2)
      rails-dom-testing (~> 1.0, >= 1.0.5)
      rails-html-sanitizer (~> 1.0, >= 1.0.2)
    actionview (4.2.3)
      activesupport (= 4.2.3)
      builder (~> 3.1)
      erubis (~> 2.7.0)
      rails-dom-testing (~> 1.0, >= 1.0.5)
      rails-html-sanitizer (~> 1.0, >= 1.0.2)
    activejob (4.2.3)
      activesupport (= 4.2.3)
      globalid (>= 0.3.0)
    activemodel (4.2.3)
      activesupport (= 4.2.3)
      builder (~> 3.1)
    activerecord (4.2.3)
      activemodel (= 4.2.3)
      activesupport (= 4.2.3)
      arel (~> 6.0)
    activesupport (4.2.3)
      i18n (~> 0.7)
      json (~> 1.7, >= 1.7.7)
      minitest (~> 5.1)
      thread_safe (~> 0.3, >= 0.3.4)
      tzinfo (~> 1.1)
    arel (6.0.3)
    autoprefixer-rails (6.0.3)
      execjs
      json
    bcrypt (3.1.10)
    better_errors (2.1.1)
      coderay (>= 1.0.0)
      erubis (>= 2.6.6)
      rack (>= 0.9.0)
    binding_of_caller (0.7.2)
      debug_inspector (>= 0.0.1)
    bootstrap-sass (3.3.4.1)
      autoprefixer-rails (>= 5.0.0.1)
      sass (>= 3.2.19)
    builder (3.2.2)
    byebug (6.0.2)
    capistrano (3.4.0)
      i18n
      rake (>= 10.0.0)
      sshkit (~> 1.3)
    capistrano-bundler (1.1.4)
      capistrano (~> 3.1)
      sshkit (~> 1.2)
    capistrano-rails (1.1.3)
      capistrano (~> 3.1)
      capistrano-bundler (~> 1.1)
    capistrano-rvm (0.1.2)
      capistrano (~> 3.0)
      sshkit (~> 1.2)
    capistrano3-puma (1.2.1)
      capistrano (~> 3.0)
      puma (>= 2.6)
    choice (0.2.0)
    coderay (1.1.0)
    coffee-rails (4.1.0)
      coffee-script (>= 2.2.0)
      railties (>= 4.0.0, < 5.0)
    coffee-script (2.4.1)
      coffee-script-source
      execjs
    coffee-script-source (1.9.1.1)
    colorize (0.7.7)
    daemons (1.2.3)
    debug_inspector (0.0.2)
    devise (3.5.2)
      bcrypt (~> 3.0)
      orm_adapter (~> 0.1)
      railties (>= 3.2.6, < 5)
      responders
      thread_safe (~> 0.1)
      warden (~> 1.2.3)
    erubis (2.7.0)
    eventmachine (1.0.8)
    execjs (2.6.0)
    font-awesome-rails (4.4.0.0)
      railties (>= 3.2, < 5.0)
    globalid (0.3.6)
      activesupport (>= 4.1.0)
    haml (4.0.7)
      tilt
    i18n (0.7.0)
    jbuilder (2.3.2)
      activesupport (>= 3.0.0, < 5)
      multi_json (~> 1.2)
    jquery-rails (4.0.5)
      rails-dom-testing (~> 1.0)
      railties (>= 4.2.0)
      thor (>= 0.14, < 2.0)
    jquery-ui-rails (5.0.5)
      railties (>= 3.2.16)
    json (1.8.3)
    kaminari (0.16.3)
      actionpack (>= 3.0.0)
      activesupport (>= 3.0.0)
    loofah (2.0.3)
      nokogiri (>= 1.5.9)
    mail (2.6.3)
      mime-types (>= 1.16, < 3)
    mime-types (2.6.2)
    mini_portile (0.6.2)
    minitest (5.8.1)
    multi_json (1.11.2)
    mysql2 (0.3.20)
    nested_form (0.3.2)
    net-scp (1.2.1)
      net-ssh (>= 2.6.5)
    net-ssh (3.0.1)
    nokogiri (1.6.6.2)
      mini_portile (~> 0.6.0)
    orm_adapter (0.5.0)
    puma (2.14.0)
    rack (1.6.4)
    rack-pjax (0.8.0)
      nokogiri (~> 1.5)
      rack (~> 1.1)
    rack-test (0.6.3)
      rack (>= 1.0)
    rails (4.2.3)
      actionmailer (= 4.2.3)
      actionpack (= 4.2.3)
      actionview (= 4.2.3)
      activejob (= 4.2.3)
      activemodel (= 4.2.3)
      activerecord (= 4.2.3)
      activesupport (= 4.2.3)
      bundler (>= 1.3.0, < 2.0)
      railties (= 4.2.3)
      sprockets-rails
    rails-deprecated_sanitizer (1.0.3)
      activesupport (>= 4.2.0.alpha)
    rails-dom-testing (1.0.7)
      activesupport (>= 4.2.0.beta, < 5.0)
      nokogiri (~> 1.6.0)
      rails-deprecated_sanitizer (>= 1.0.1)
    rails-erd (1.4.3)
      activerecord (>= 3.2)
      activesupport (>= 3.2)
      choice (~> 0.2.0)
      ruby-graphviz (~> 1.2)
    rails-html-sanitizer (1.0.2)
      loofah (~> 2.0)
    rails_12factor (0.0.2)
      rails_serve_static_assets
      rails_stdout_logging
    rails_admin (0.6.8)
      builder (~> 3.1)
      coffee-rails (~> 4.0)
      font-awesome-rails (>= 3.0, < 5)
      haml (~> 4.0)
      jquery-rails (>= 3.0, < 5)
      jquery-ui-rails (~> 5.0)
      kaminari (~> 0.14)
      nested_form (~> 0.3)
      rack-pjax (~> 0.7)
      rails (~> 4.0)
      remotipart (~> 1.0)
      safe_yaml (~> 1.0)
      sass-rails (>= 4.0, < 6)
    rails_serve_static_assets (0.0.4)
    rails_stdout_logging (0.0.4)
    railties (4.2.3)
      actionpack (= 4.2.3)
      activesupport (= 4.2.3)
      rake (>= 0.8.7)
      thor (>= 0.18.1, < 2.0)
    rake (10.4.2)
    rdoc (4.2.0)
      json (~> 1.4)
    remotipart (1.2.1)
    responders (2.1.0)
      railties (>= 4.2.0, < 5)
    ruby-graphviz (1.2.2)
    safe_yaml (1.0.4)
    sass (3.4.18)
    sass-rails (5.0.4)
      railties (>= 4.0.0, < 5.0)
      sass (~> 3.1)
      sprockets (>= 2.8, < 4.0)
      sprockets-rails (>= 2.0, < 4.0)
      tilt (>= 1.1, < 3)
    sdoc (0.4.1)
      json (~> 1.7, >= 1.7.7)
      rdoc (~> 4.0)
    sprockets (3.3.5)
      rack (> 1, < 3)
    sprockets-rails (2.3.3)
      actionpack (>= 3.0)
      activesupport (>= 3.0)
      sprockets (>= 2.8, < 4.0)
    sshkit (1.7.1)
      colorize (>= 0.7.0)
      net-scp (>= 1.1.2)
      net-ssh (>= 2.8.0)
    thin (1.6.4)
      daemons (~> 1.0, >= 1.0.9)
      eventmachine (~> 1.0, >= 1.0.4)
      rack (~> 1.0)
    thor (0.19.1)
    thread_safe (0.3.5)
    tilt (2.0.1)
    turbolinks (2.5.3)
      coffee-rails
    tzinfo (1.2.2)
      thread_safe (~> 0.1)
    tzinfo-data (1.2015.7)
      tzinfo (>= 1.0.0)
    uglifier (2.7.2)
      execjs (>= 0.3.0)
      json (>= 1.8.0)
    warden (1.2.3)
      rack (>= 1.0)
    web-console (2.2.1)
      activemodel (>= 4.0)
      binding_of_caller (>= 0.7.2)
      railties (>= 4.0)
      sprockets-rails (>= 2.0, < 4.0)

PLATFORMS
  x86-mingw32

DEPENDENCIES
  better_errors
  bootstrap-sass (~> 3.3.4.1)
  byebug
  capistrano
  capistrano-bundler
  capistrano-rails
  capistrano-rvm
  capistrano3-puma
  coffee-rails (~> 4.1.0)
  devise
  execjs
  jbuilder (~> 2.0)
  jquery-rails
  jquery-ui-rails
  mysql2 (~> 0.3.18)
  puma
  rails (= 4.2.3)
  rails-erd
  rails_12factor (= 0.0.2)
  rails_admin (~> 0.6.8)
  sass-rails (~> 5.0)
  sdoc (~> 0.4.0)
  therubyracer
  thin
  turbolinks
  tzinfo-data
  uglifier (>= 1.3.0)
  web-console (~> 2.0)

我已经在我的Gemfile中指定了gem 'mysql2', '~> 0.3.18'，所以我不知道可以用什么其他解决方案解决这个问题。

请帮忙。谢谢！ ：）

1 个答案:

答案 0 :(得分：0)

我终于解决了它。

实际上，在添加gem 'mysql2', '~> 0.3.18'之后，我需要先将其推送到Github上的存储库，然后再将其部署到服务器上。

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