【发布时间】：2019-11-08 02:24:15
【问题描述】：
我在 Linux 服务器（Amazon AMI v 2018.03 rhel fedora）上有一个可运行的 Ruby on Rails 应用程序（运行 Ruby 2.2.10p489 和 Rails 4.2.5 和 activerecord-sqlserver-adapter 4.2.6）。它连接到 Azure 数据库。一切都很好。但是，当我迁移到不同的 Azure 数据库并将凭据更改为指向新数据库时，我会得到一长串无用的错误，如下所示：
SystemStackError: stack level too deep
from /apps/acme_dynamite/path/ruby/2.2/gems/tiny_tds-1.0.5/lib/tiny_tds/client.rb:53:in `connect'
from /apps/acme_dynamite/path/ruby/2.2/gems/tiny_tds-1.0.5/lib/tiny_tds/client.rb:53:in `initialize'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-sqlserver-adapter-4.2.6/lib/active_record/connection_adapters/sqlserver_adapter.rb:280:in `new'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-sqlserver-adapter-4.2.6/lib/active_record/connection_adapters/sqlserver_adapter.rb:280:in `dblib_connect'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-sqlserver-adapter-4.2.6/lib/active_record/connection_adapters/sqlserver_adapter.rb:271:in `connect'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-sqlserver-adapter-4.2.6/lib/active_record/connection_adapters/sqlserver_adapter.rb:59:in `initialize'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-sqlserver-adapter-4.2.6/lib/active_record/sqlserver_base.rb:18:in `new'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-sqlserver-adapter-4.2.6/lib/active_record/sqlserver_base.rb:18:in `sqlserver_connection'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:438:in `new_connection'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:448:in `checkout_new_connection'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:422:in `acquire_connection'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:349:in `block in checkout'
from /usr/share/ruby/2.2/monitor.rb:211:in `mon_synchronize'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:348:in `checkout'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:263:in `block in connection'
from /usr/share/ruby/2.2/monitor.rb:211:in `mon_synchronize'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:262:in `connection'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-4.2.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:571:in `retrieve_connection'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-4.2.5/lib/active_record/connection_handling.rb:113:in `retrieve_connection'
from /apps/acme_dynamite/path/ruby/2.2/gems/activerecord-4.2.5/lib/active_record/connection_handling.rb:87:in `connection'
from (irb):1
from /apps/acme_dynamite/path/ruby/2.2/gems/railties-4.2.5/lib/rails/commands/console.rb:110:in `start'
from /apps/acme_dynamite/path/ruby/2.2/gems/railties-4.2.5/lib/rails/commands/console.rb:9:in `start'
from /apps/acme_dynamite/path/ruby/2.2/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:68:in `console'
from /apps/acme_dynamite/path/ruby/2.2/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /apps/acme_dynamite/path/ruby/2.2/gems/railties-4.2.5/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
有效的 Azure 连接如下所示：
env PRODUCTION_DATABASE_HOST="xxx.database.windows.net"
env PRODUCTION_DATABASE_PORT=1433
env PRODUCTION_DATABASE="databasename_no_dots"
env PRODUCTION_DATABASE_USERNAME="username_no_dots_or_ands"
env PRODUCTION_DATABASE_PASSWORD="supersecret"
不工作的看起来像：
env PRODUCTION_DATABASE_HOST="xxx2.database.windows.net"
env PRODUCTION_DATABASE_PORT=1433
env PRODUCTION_DATABASE="other_databasename_no_dots"
env PRODUCTION_DATABASE_USERNAME="username_no_dots_or_ands"
env PRODUCTION_DATABASE_PASSWORD="supersecret"
问题不在于连接或防火墙，因为我实际上可以使用 /node_modules/sql-cli 连接到这个新的 Azure 服务器。什么可能是错的？我的 Ruby 版本与 Azure 的其他实例之间存在一些不兼容性？我没有想法。
只要发出如下语句，就可以在 irb 中触发一堆错误：
results = ActiveRecord::Base.connection.exec_query("SELECT 1")
【问题讨论】：
-
“堆栈级别太深”意味着一个方法在不经意间以某种方式调用了自己。您能否将范围缩小到您更改的导致问题的确切原因？您是否探索过升级依赖项，因为这可能是在以后的补丁中解决的已知错误？值得尝试 Rails 4.2.6 和更多最新驱动程序。
-
但在这种情况下唯一的区别是数据库是由不同的服务器提供的。为什么将提供数据的位置从导致失控递归更改？ Azure-Rails 界面极其脆弱的特性让我很高兴自己是一名 Node.js 开发人员。
标签： ruby-on-rails sql-server ruby azure