我真的很陌生。我一直在尝试设置学习Rails的条件，但我无法通过Mysql！我绝对需要帮助！
我尝试了2天时间来解决Mysql问题“用户'root'@'localhost'的访问被拒绝”，但是没有成功。我已经“解决”了三个相关的问题：创建所需的目录，将服务器更改为localhost，并通过更改密码来保护对root的访问。现在，问题似乎出在database.yml上，因为我看到密码为空。但是我无法使用config/database.yml进行更改，而是可以使用cat config/database.yml进行查看。
此外，为了澄清这一点，我只能使用rails s -b 0.0.0.0而不是rails s将其显示在浏览器中。
这是我运行并尝试访问它时出现的内容：
[vagrant|5.2.2.1#2.4.2] /vagrant/proj master*
$ rails s -b 0.0.0.0
/home/vagrant/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/railties-5.2.2.1/lib/rails/app_loader.rb:53: warning: Insecure world writable dir /vagrant/proj/./bin in PATH, mode 040777
=> Booting Puma
=> Rails 5.2.2.1 application starting in development
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.12.1 (ruby 2.4.2-p198), codename: Llamas in Pajamas
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3000
Use Ctrl-C to stop
Started GET "/" for 10.0.2.2 at 2019-03-24 23:02:25 +0000
Cannot render console from 10.0.2.2! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255
Mysql2::Error (Access denied for user 'root'@'localhost'):
mysql2 (0.5.2) lib/mysql2/client.rb:90:in `connect'
mysql2 (0.5.2) lib/mysql2/client.rb:90:in `initialize'
activerecord (5.2.2.1) lib/active_record/connection_adapters/mysql2_adapter.rb:22:in `new'
activerecord (5.2.2.1) lib/active_record/connection_adapters/mysql2_adapter.rb:22:in `mysql2_connection'
activerecord (5.2.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:811:in `new_connection'
activerecord (5.2.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:855:in `checkout_new_connection'
activerecord (5.2.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:834:in `try_to_checkout_new_connection'
activerecord (5.2.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:795:in `acquire_connection'
activerecord (5.2.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:523:in `checkout'
activerecord (5.2.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:382:in `connection'
activerecord (5.2.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:1010:in `retrieve_connection'
activerecord (5.2.2.1) lib/active_record/connection_handling.rb:118:in `retrieve_connection'
activerecord (5.2.2.1) lib/active_record/connection_handling.rb:90:in `connection'
activerecord (5.2.2.1) lib/active_record/migration.rb:554:in `call'
actionpack (5.2.2.1) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (5.2.2.1) lib/active_support/callbacks.rb:98:in `run_callbacks'
actionpack (5.2.2.1) lib/action_dispatch/middleware/callbacks.rb:26:in `call'
actionpack (5.2.2.1) lib/action_dispatch/middleware/executor.rb:14:in `call'
actionpack (5.2.2.1) lib/action_dispatch/middleware/debug_exceptions.rb:61:in `call'
web-console (3.7.0) lib/web_console/middleware.rb:135:in `call_app'
web-console (3.7.0) lib/web_console/middleware.rb:22:in `block in call'
web-console (3.7.0) lib/web_console/middleware.rb:20:in `catch'
web-console (3.7.0) lib/web_console/middleware.rb:20:in `call'
actionpack (5.2.2.1) lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
railties (5.2.2.1) lib/rails/rack/logger.rb:38:in `call_app'
railties (5.2.2.1) lib/rails/rack/logger.rb:26:in `block in call'
activesupport (5.2.2.1) lib/active_support/tagged_logging.rb:71:in `block in tagged'
activesupport (5.2.2.1) lib/active_support/tagged_logging.rb:28:in `tagged'
activesupport (5.2.2.1) lib/active_support/tagged_logging.rb:71:in `tagged'
railties (5.2.2.1) lib/rails/rack/logger.rb:26:in `call'
sprockets-rails (3.2.1) lib/sprockets/rails/quiet_assets.rb:13:in `call'
actionpack (5.2.2.1) lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
actionpack (5.2.2.1) lib/action_dispatch/middleware/request_id.rb:27:in `call'
rack (2.0.6) lib/rack/method_override.rb:22:in `call'
rack (2.0.6) lib/rack/runtime.rb:22:in `call'
activesupport (5.2.2.1) lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
actionpack (5.2.2.1) lib/action_dispatch/middleware/executor.rb:14:in `call'
actionpack (5.2.2.1) lib/action_dispatch/middleware/static.rb:127:in `call'
rack (2.0.6) lib/rack/sendfile.rb:111:in `call'
railties (5.2.2.1) lib/rails/engine.rb:524:in `call'
puma (3.12.1) lib/puma/configuration.rb:227:in `call'
puma (3.12.1) lib/puma/server.rb:660:in `handle_request'
puma (3.12.1) lib/puma/server.rb:474:in `process_client'
puma (3.12.1) lib/puma/server.rb:334:in `block in run'
puma (3.12.1) lib/puma/thread_pool.rb:135:in `block in spawn_thread'
这就是我的浏览器上显示的内容：here
