执行 rails generate controller StaticPages 帮助联系后在浏览器中获取 LoadError

【问题标题】：Getting a LoadError in browser after executing rails generate controller StaticPages help contact执行 rails generate controller StaticPages 帮助联系后在浏览器中获取 LoadError
【发布时间】：2015-02-28 04:35:47
【问题描述】：

我知道在 Windows 上运行 ruby​​ on rails 会遇到很多问题，但在我得到一台运行 Linux 或 OSx 的新笔记本电脑之前，我无能为力。

这是我随机面临的另一个问题。经过大量的试验和错误，我上次能够修复它，所以我现在忘记了如何修复它。 这是我到目前为止所做的事情，

  1. 创建了一个新的 rails 应用程序

  2. 跑rails generate controller StaticPages home help 一切都很好。我看到创建了新的静态页面，但是当我运行 rails 服务器并点击 localhost:3000/static_pages/home 时，我在浏览器响应中看到以下错误，

    在 2015-02-28 15:21:13 +1100 开始 GET "/static_pages/home" for 127.0.0.1

    LoadError (Could not load 'active_record/connection_adapters/sqlite3_adapter'. M
ake sure that the adapter in config/database.yml is valid. If you use an adapter
 other than 'mysql', 'mysql2', 'postgresql' or 'sqlite3' add the necessary adapt
er gem to the Gemfile.):
  activesupport (4.2.0) lib/active_support/dependencies.rb:274:in `require'
  activesupport (4.2.0) lib/active_support/dependencies.rb:274:in `block in requ
ire'
  activesupport (4.2.0) lib/active_support/dependencies.rb:240:in `load_dependen

    activesupport (4.2.0) lib/active_support/dependencies.rb:274:in require' activerecord (4.2.0) lib/active_record/connection_adapters/sqlite3_adapter.rb: 6:in' activesupport (4.2.0) lib/active_support/dependencies.rb:274:in require' activesupport (4.2.0) lib/active_support/dependencies.rb:274:inblock in requ 愤怒' activesupport (4.2.0) lib/active_support/dependencies.rb:240:in load_dependen cy' activesupport (4.2.0) lib/active_support/dependencies.rb:274:inrequire' activerecord (4.2.0) lib/active_record/connection_adapters/connection_specific ation.rb:175:in spec' activerecord (4.2.0) lib/active_record/connection_handling.rb:50:in建立 _联系' activerecord (4.2.0) lib/active_record/railtie.rb:120:in block (2 levels) in <class:Railtie>' activesupport (4.2.0) lib/active_support/lazy_load_hooks.rb:38:ininstance_ev 阿尔' activesupport (4.2.0) lib/active_support/lazy_load_hooks.rb:38:in execute_hoo k' activesupport (4.2.0) lib/active_support/lazy_load_hooks.rb:45:inblock in ru n_load_hooks' activesupport (4.2.0) lib/active_support/lazy_load_hooks.rb:44:in each' activesupport (4.2.0) lib/active_support/lazy_load_hooks.rb:44:inrun_load_ho 好的' activerecord (4.2.0) lib/active_record/base.rb:316:in <module:ActiveRecord>' activerecord (4.2.0) lib/active_record/base.rb:26:in' activerecord (4.2.0) lib/active_record/migration.rb:384:in connection' activerecord (4.2.0) lib/active_record/migration.rb:371:incall' actionpack (4.2.0) lib/action_dispatch/middleware/callbacks.rb:29:in block in call' activesupport (4.2.0) lib/active_support/callbacks.rb:88:incall' activesupport (4.2.0) lib/active_support/callbacks.rb:88:in _run_callbacks' activesupport (4.2.0) lib/active_support/callbacks.rb:734:in_run_call_callba CK' activesupport (4.2.0) lib/active_support/callbacks.rb:81:in run_callbacks' actionpack (4.2.0) lib/action_dispatch/middleware/callbacks.rb:27:incall' actionpack (4.2.0) lib/action_dispatch/middleware/reloader.rb:73:in call' actionpack (4.2.0) lib/action_dispatch/middleware/remote_ip.rb:78:incall' actionpack (4.2.0) lib/action_dispatch/middleware/debug_exceptions.rb:17:in c all' actionpack (4.2.0) lib/action_dispatch/middleware/show_exceptions.rb:30:inca 二' railties (4.2.0) lib/rails/rack/logger.rb:38:in call_app' railties (4.2.0) lib/rails/rack/logger.rb:20:inblock in call' activesupport (4.2.0) lib/active_support/tagged_logging.rb:68:in block in tag ged' activesupport (4.2.0) lib/active_support/tagged_logging.rb:26:intagged' activesupport (4.2.0) lib/active_support/tagged_logging.rb:68:in tagged' railties (4.2.0) lib/rails/rack/logger.rb:20:incall' actionpack (4.2.0) lib/action_dispatch/middleware/request_id.rb:21:in call' rack (1.6.0) lib/rack/methodoverride.rb:22:incall' 机架 (1.6.0) lib/rack/runtime.rb:18:in call' activesupport (4.2.0) lib/active_support/cache/strategy/local_cache_middleware .rb:28:incall' 机架 (1.6.0) lib/rack/lock.rb:17:in call' actionpack (4.2.0) lib/action_dispatch/middleware/static.rb:113:incall' 机架 (1.6.0) lib/rack/sendfile.rb:113:in call' railties (4.2.0) lib/rails/engine.rb:518:incall' railties (4.2.0) lib/rails/application.rb:164:in call' rack (1.6.0) lib/rack/lock.rb:17:incall' rack (1.6.0) lib/rack/content_length.rb:15:in `call'

      rack (1.6.0) lib/rack/handler/webrick.rb:89:in `service'
  C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `s
ervice'
  C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `ru
n'
  C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/webrick/server.rb:295:in `block
 in start_thread'


  Rendered C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/actionpack-4
.2.0/lib/action_dispatch/middleware/templates/rescues/_source.erb (1.0ms)
  Rendered C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/actionpack-4
.2.0/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (5.0ms)
  Rendered C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/actionpack-4
.2.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html
.erb (1.0ms)
  Rendered C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/actionpack-4
.2.0/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb withi
n rescues/layout (58.0ms)

Could not load 'active_record/connection_adapters/sqlite3_adapter' 这里有一个类似的问题，但提出问题的人不接受该解决方案。我也试过了，它对我不起作用。

宝石文件

source 'https://rubygems.org'

gem 'rails',                '4.2.0'
gem 'sass-rails',           '5.0.1'
gem 'uglifier',             '2.5.3'
gem 'coffee-rails',         '4.1.0'
gem 'jquery-rails',         '4.0.3'
gem 'turbolinks',           '2.3.0'
gem 'jbuilder',             '2.2.3'
gem 'sdoc',                 '0.4.0', group: :doc

gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw]

group :development, :test do
  gem 'sqlite3',     '1.3.9'
  gem 'byebug',      '3.4.0'
  #gem 'web-console', '2.0.0.beta3'
  gem 'spring',      '1.1.3'
end

group :test do
  gem 'minitest-reporters', '1.0.5'
  gem 'mini_backtrace',     '0.1.3'
  gem 'guard-minitest',     '2.3.1'
end

group :production do
  gem 'pg',             '0.17.1'
  gem 'rails_12factor', '0.0.2'
end

Gemfile.lock

GEM
  remote: https://rubygems.org/
  specs:
    actionmailer (4.2.0)
      actionpack (= 4.2.0)
      actionview (= 4.2.0)
      activejob (= 4.2.0)
      mail (~> 2.5, >= 2.5.4)
      rails-dom-testing (~> 1.0, >= 1.0.5)
    actionpack (4.2.0)
      actionview (= 4.2.0)
      activesupport (= 4.2.0)
      rack (~> 1.6.0)
      rack-test (~> 0.6.2)
      rails-dom-testing (~> 1.0, >= 1.0.5)
      rails-html-sanitizer (~> 1.0, >= 1.0.1)
    actionview (4.2.0)
      activesupport (= 4.2.0)
      builder (~> 3.1)
      erubis (~> 2.7.0)
      rails-dom-testing (~> 1.0, >= 1.0.5)
      rails-html-sanitizer (~> 1.0, >= 1.0.1)
    activejob (4.2.0)
      activesupport (= 4.2.0)
      globalid (>= 0.3.0)
    activemodel (4.2.0)
      activesupport (= 4.2.0)
      builder (~> 3.1)
    activerecord (4.2.0)
      activemodel (= 4.2.0)
      activesupport (= 4.2.0)
      arel (~> 6.0)
    activesupport (4.2.0)
      i18n (~> 0.7)
      json (~> 1.7, >= 1.7.7)
      minitest (~> 5.1)
      thread_safe (~> 0.3, >= 0.3.4)
      tzinfo (~> 1.1)
    ansi (1.5.0)
    arel (6.0.0)
    builder (3.2.2)
    byebug (3.4.0)
      columnize (~> 0.8)
      debugger-linecache (~> 1.2)
      slop (~> 3.6)
    celluloid (0.16.0)
      timers (~> 4.0.0)
    coderay (1.1.0)
    coffee-rails (4.1.0)
      coffee-script (>= 2.2.0)
      railties (>= 4.0.0, < 5.0)
    coffee-script (2.3.0)
      coffee-script-source
      execjs
    coffee-script-source (1.9.1)
    columnize (0.9.0)
    debugger-linecache (1.2.0)
    erubis (2.7.0)
    execjs (2.3.0)
    ffi (1.9.6-x86-mingw32)
    formatador (0.2.5)
    globalid (0.3.3)
      activesupport (>= 4.1.0)
    guard (2.12.4)
      formatador (>= 0.2.4)
      listen (~> 2.7)
      lumberjack (~> 1.0)
      nenv (~> 0.1)
      notiffany (~> 0.0)
      pry (>= 0.9.12)
      shellany (~> 0.0)
      thor (>= 0.18.1)
    guard-minitest (2.3.1)
      guard (~> 2.0)
      minitest (>= 3.0)
    hike (1.2.3)
    hitimes (1.2.2-x86-mingw32)
    i18n (0.7.0)
    jbuilder (2.2.3)
      activesupport (>= 3.0.0, < 5)
      multi_json (~> 1.2)
    jquery-rails (4.0.3)
      rails-dom-testing (~> 1.0)
      railties (>= 4.2.0)
      thor (>= 0.14, < 2.0)
    json (1.8.2)
    listen (2.8.5)
      celluloid (>= 0.15.2)
      rb-fsevent (>= 0.9.3)
      rb-inotify (>= 0.9)
    loofah (2.0.1)
      nokogiri (>= 1.5.9)
    lumberjack (1.0.9)
    mail (2.6.3)
      mime-types (>= 1.16, < 3)
    method_source (0.8.2)
    mime-types (2.4.3)
    mini_backtrace (0.1.3)
      minitest (> 1.2.0)
      rails (>= 2.3.3)
    mini_portile (0.6.2)
    minitest (5.5.1)
    minitest-reporters (1.0.5)
      ansi
      builder
      minitest (>= 5.0)
      ruby-progressbar
    multi_json (1.10.1)
    nenv (0.2.0)
    nokogiri (1.6.6.2-x86-mingw32)
      mini_portile (~> 0.6.0)
    notiffany (0.0.6)
      nenv (~> 0.1)
      shellany (~> 0.0)
    pg (0.17.1-x86-mingw32)
    pry (0.10.1-x86-mingw32)
      coderay (~> 1.1.0)
      method_source (~> 0.8.1)
      slop (~> 3.4)
      win32console (~> 1.3)
    rack (1.6.0)
    rack-test (0.6.3)
      rack (>= 1.0)
    rails (4.2.0)
      actionmailer (= 4.2.0)
      actionpack (= 4.2.0)
      actionview (= 4.2.0)
      activejob (= 4.2.0)
      activemodel (= 4.2.0)
      activerecord (= 4.2.0)
      activesupport (= 4.2.0)
      bundler (>= 1.3.0, < 2.0)
      railties (= 4.2.0)
      sprockets-rails
    rails-deprecated_sanitizer (1.0.3)
      activesupport (>= 4.2.0.alpha)
    rails-dom-testing (1.0.5)
      activesupport (>= 4.2.0.beta, < 5.0)
      nokogiri (~> 1.6.0)
      rails-deprecated_sanitizer (>= 1.0.1)
    rails-html-sanitizer (1.0.1)
      loofah (~> 2.0)
    rails_12factor (0.0.2)
      rails_serve_static_assets
      rails_stdout_logging
    rails_serve_static_assets (0.0.4)
    rails_stdout_logging (0.0.3)
    railties (4.2.0)
      actionpack (= 4.2.0)
      activesupport (= 4.2.0)
      rake (>= 0.8.7)
      thor (>= 0.18.1, < 2.0)
    rake (10.4.2)
    rb-fsevent (0.9.4)
    rb-inotify (0.9.5)
      ffi (>= 0.5.0)
    rdoc (4.2.0)
      json (~> 1.4)
    ruby-progressbar (1.7.1)
    sass (3.4.13)
    sass-rails (5.0.1)
      railties (>= 4.0.0, < 5.0)
      sass (~> 3.1)
      sprockets (>= 2.8, < 4.0)
      sprockets-rails (>= 2.0, < 4.0)
      tilt (~> 1.1)
    sdoc (0.4.0)
      json (~> 1.8)
      rdoc (~> 4.0, < 5.0)
    shellany (0.0.1)
    slop (3.6.0)
    spring (1.1.3)
    sprockets (2.12.3)
      hike (~> 1.2)
      multi_json (~> 1.0)
      rack (~> 1.0)
      tilt (~> 1.1, != 1.3.0)
    sprockets-rails (2.2.4)
      actionpack (>= 3.0)
      activesupport (>= 3.0)
      sprockets (>= 2.8, < 4.0)
    sqlite3 (1.3.9-x86-mingw32)
    thor (0.19.1)
    thread_safe (0.3.4)
    tilt (1.4.1)
    timers (4.0.1)
      hitimes
    turbolinks (2.3.0)
      coffee-rails
    tzinfo (1.2.2)
      thread_safe (~> 0.1)
    tzinfo-data (1.2015.1)
      tzinfo (>= 1.0.0)
    uglifier (2.5.3)
      execjs (>= 0.3.0)
      json (>= 1.8.0)
    win32console (1.3.2-x86-mingw32)

PLATFORMS
  x86-mingw32

DEPENDENCIES
  byebug (= 3.4.0)
  coffee-rails (= 4.1.0)
  guard-minitest (= 2.3.1)
  jbuilder (= 2.2.3)
  jquery-rails (= 4.0.3)
  mini_backtrace (= 0.1.3)
  minitest-reporters (= 1.0.5)
  pg (= 0.17.1)
  rails (= 4.2.0)
  rails_12factor (= 0.0.2)
  sass-rails (= 5.0.1)
  sdoc (= 0.4.0)
  spring (= 1.1.3)
  sqlite3 (= 1.3.9)
  turbolinks (= 2.3.0)
  tzinfo-data
  uglifier (= 2.5.3)

数据库.yml 

# SQLite version 3.x
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem 'sqlite3'
#
default: &default
  adapter: sqlite3
  pool: 5
  timeout: 5000

development:
  <<: *default
  database: db/development.sqlite3

# 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:
  <<: *default
  database: db/test.sqlite3

production:
  <<: *default
  database: db/production.sqlite3

更新： rails 的命令现在正在抛出这个异常，

C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/sqlite3-1.3.9-x86-mingw32/l
ib/sqlite3.rb:6:in `require': cannot load such file -- sqlite3/sqlite3_native (L
oadError)
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/sqlite3-1.3.9-
x86-mingw32/lib/sqlite3.rb:6:in `rescue in <top (required)>'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/sqlite3-1.3.9-
x86-mingw32/lib/sqlite3.rb:2:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler/runtime.rb:76:in `require'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler/runtime.rb:76:in `block (2 levels) in require'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler/runtime.rb:72:in `each'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler/runtime.rb:72:in `block in require'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler/runtime.rb:61:in `each'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler/runtime.rb:61:in `require'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler.rb:133:in `require'
        from C:/RailsInstaller/work/sample_app/config/application.rb:7:in `<top
(required)>'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.0
/lib/rails/commands/commands_tasks.rb:78:in `require'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.0
/lib/rails/commands/commands_tasks.rb:78:in `block in server'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.0
/lib/rails/commands/commands_tasks.rb:75:in `tap'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.0
/lib/rails/commands/commands_tasks.rb:75:in `server'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.0
/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.2.0
/lib/rails/commands.rb:17:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'

如果有人可以在这里帮助我，不胜感激..

【问题讨论】：

  • 添加你的database.yml
  • @mohommad AbuShady.. 为什么？我正在使用 sqlite3，并在我的 Gemfile 中添加了它
  • 因为报错是在抱怨你的database.yml，所以就想看看
  • bundle install 没有抱怨？
  • 您在生产组中有pg，但在database.yml中有sqlite，如果您在生产环境中运行，那就是问题所在，请将pg gem 替换为sqlite development、testing 环境中的那些

标签： ruby-on-rails ruby ruby-on-rails-3


【解决方案1】：

问题似乎与您使用的 sqlite3 版本有关。试试看

gem 'sqlite3', '>= 1.3.9'

代替

gem 'sqlite3', '1.3.9'

【讨论】：

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