MySQL/Rails的 - Mysql2 ::錯誤（訪問被拒絕的用戶'rails_user'@'localhost'數據庫'simple_cms_development'）：

Question

我是MySQL和Rails的新手。我正在經歷一個關於Lynda（Ruby on Rails 5）的課程，我遇到了一個呃逆。創建數據庫後，讓我啓動MySQL和Puma。我試圖訪問本地主機：3000，但是我得到以下錯誤：

Mysql2::Error (Access denied for user 'rails_user'@'localhost' to database 'simple_cms_development'): 

看起來一切正常，MySQL和彪馬開始：

Johns-MBP:simple_cms johnerickson$ mysql.server start 
Starting MySQL 
SUCCESS! 
Johns-MBP:simple_cms johnerickson$ rails s 
=> Booting Puma 
=> Rails 5.0.0.1 application starting in development on http://localhost:3000 
=> Run `rails server -h` for more startup options 
Puma starting in single mode... 
* Version 3.6.0 (ruby 2.3.0-p0), codename: Sleepy Sunday Serenity 
* Min threads: 5, max threads: 5 
* Environment: development 
* Listening on tcp://localhost:3000 
* List item 

下面是我的database.yml文件：

default: &default 
    adapter: mysql2 
    encoding: utf8 
    pool: 5 
    username: rails_user 
    password: ***The password works*** 
    host: localhost 

development: 
    <<: *default 
    database: simple_cms_development 

我通過堆棧溢出望去，看到別人有過類似的問題，但它似乎是一個密碼問題，這我沒有。任何幫助將不勝感激。

Answer 1

此特定用戶沒有足夠權限訪問數據庫。在mysql提示符下運行以下命令後嘗試。您可能必須以root或其他管理員用戶身份登錄才能運行此操作。

grant all on simple_cms_development.* to 'rails_user'@'localhost' identified by '<password>'; 
flush privileges;