Ruby on rails Random ActiveRecord:：Statement Heroku上Rails 4应用程序出现无效错误

我的Rails 4应用程序在本地运行良好，并且在生产模式下部署到Heroku时也运行良好。。。在我从第二个客户端访问应用程序之前。。。单击几下后，我开始出现以下奇怪的错误序列（见下文）

确切的点击次数略有不同，但最终总是会发生。。。但只有在第二个客户端发出请求后。例如，如果我重启应用程序，只在手机上玩，什么都不会发生。但只要我从笔记本电脑上下载几页。。。撞车

错误 注意：这些屏幕截图带有

RAILS\u ENV=development

，以便显示实际错误

我不确定我是否正确理解了这些错误，但在查询中似乎没有正确地替换

？

环境详情

• 轨道4.2
• 在Heroku主持
• Ruby 2.2.x
• MySQL（通过ClearDB附加组件）

我的档案：

source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.3'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks', '~> 2.3.0'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc
gem 'devise'
gem "paperclip"
gem 'aws-sdk'
gem 'dotenv-rails', :groups => [:development, :test]
gem 'foundation-rails'
# Access an IRB console on exception pages or by using <%= console %> in views
gem 'web-console', '~> 2.0', group: :development
gem 'mysql'
gem 'rails_12factor', group: :production
gem 'puma'
group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug'
  # Use sqlite3 as the database for Active Record
  gem 'sqlite3'    
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
end

这是我的数据库

# 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:
  url: <%= ENV['DATABASE_URL'] %>

我尝试过的事情：

• 重新启动所有dynos（工作一分钟，但问题再次出现）
• 切换到

  gem mysql2

  （甚至无法运行此功能）请参阅下面的答案
• 切换到

  gem puma

  （如下
• 使用客户端连接到数据库（一切似乎都正常）
• 确认请求的参数正确（请求参数看起来很好）
• 多次阅读

类似的问题并没有解决我的问题

---

我第二次尝试部署mysql2 gem，这次成功了。秘方来自

TLDR； 为了与Rails的新版本兼容，您需要指定mysql2的新版本和旧版本。是的，这很奇怪

gem 'mysql2', '~> 0.3.18'

在使用这个gem部署之后，我再也不能重现这个问题了。我不理解它，但它成功了

---

如果有人提交了一个解释发生了什么的答案，我会接受。

您是否尝试过将您的开发环境切换到MySQL并在那里重现问题？无论如何，这是一个好主意，使用不同的数据库开发/测试和部署会带来麻烦。@muistooshort我现在正在处理这个问题。我不确定由于问题的“第二个客户端”方面，我将能够在本地复制它。但是我会尝试。我同意匹配环境。这个项目是moment@muistooshort因此，在设置本地环境以使用MySql的过程中，我让mysql2 gem工作了……现在问题没有发生。（见下面我的答案）。这对你来说有意义吗？有点疯狂，但没有什么是愚蠢的。我不使用MySQL，但我也有版本号欺诈，所以我对此并不感到非常惊讶。

Rails.application.configure do
  # Settings specified here will take precedence over those in config/application.rb.

  # Code is not reloaded between requests.
  config.cache_classes = true

  # Eager load code on boot. This eager loads most of Rails and
  # your application in memory, allowing both threaded web servers
  # and those relying on copy on write to perform better.
  # Rake tasks automatically ignore this option for performance.
  config.eager_load = true

  # Full error reports are disabled and caching is turned on.
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true

  # Enable Rack::Cache to put a simple HTTP cache in front of your application
  # Add `rack-cache` to your Gemfile before enabling this.
  # For large-scale production use, consider using a caching reverse proxy like
  # NGINX, varnish or squid.
  # config.action_dispatch.rack_cache = true

  # Disable serving static files from the `/public` folder by default since
  # Apache or NGINX already handles this.
  config.serve_static_files = ENV['RAILS_SERVE_STATIC_FILES'].present?

  # Compress JavaScripts and CSS.
  config.assets.js_compressor = :uglifier
  # config.assets.css_compressor = :sass

  # Do not fallback to assets pipeline if a precompiled asset is missed.
  config.assets.compile = false

  # Asset digests allow you to set far-future HTTP expiration dates on all assets,
  # yet still be able to expire them through the digest params.
  config.assets.digest = true

  # `config.assets.precompile` and `config.assets.version` have moved to config/initializers/assets.rb

  # Specifies the header that your server uses for sending files.
  # config.action_dispatch.x_sendfile_header = 'X-Sendfile' # for Apache
  # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX

  # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
  # config.force_ssl = true

  # Use the lowest log level to ensure availability of diagnostic information
  # when problems arise.
  config.log_level = :debug

  # Prepend all log lines with the following tags.
  # config.log_tags = [ :subdomain, :uuid ]

  # Use a different logger for distributed setups.
  # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)

  # Use a different cache store in production.
  # config.cache_store = :mem_cache_store

  # Enable serving of images, stylesheets, and JavaScripts from an asset server.
  # config.action_controller.asset_host = 'http://assets.example.com'

  # Ignore bad email addresses and do not raise email delivery errors.
  # Set this to true and configure the email server for immediate delivery to raise delivery errors.
  # config.action_mailer.raise_delivery_errors = false

  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
  # the I18n.default_locale when a translation cannot be found).
  config.i18n.fallbacks = true

  # Send deprecation notices to registered listeners.
  config.active_support.deprecation = :notify

  # Use default logging formatter so that PID and timestamp are not suppressed.
  config.log_formatter = ::Logger::Formatter.new

  # Do not dump schema after migrations.
  config.active_record.dump_schema_after_migration = false

  config.serve_static_files = true

  config.paperclip_defaults = {
    storage: :s3,
    s3_credentials: {
      bucket: ENV.fetch('S3_BUCKET'),
      access_key_id: ENV.fetch('ACCESS_KEY_ID'),
      secret_access_key: ENV.fetch('SECRET_ACCESS_KEY'),
      s3_region: ENV.fetch('S3_REGION'),
      s3_host_name: 's3-us-west-2.amazonaws.com'
    }
  }


end

gem 'mysql2', '~> 0.3.18'