Rails rake中止！t.sqlite3已存在

我正在重新安装回形针gem，但尝试运行迁移时遇到错误。（注意：我只从文本编辑器中删除了原始迁移文件）。具体而言，当我跑：Rails rake中止！t.sqlite3已存在

$ rake db:migrate

我遇到：

rake aborted! 
StandardError: An error has occurred, this and all later migrations canceled: 

SQLite3::SQLException: duplicate column name: image_file_name: ALTER TABLE "pins" ADD "image_file_name" varchar 
c:/Users/Jaye/Desktop/inspireboard/db/migrate/20160929074428_add_attachment_image_to_pins.rb:4:in `block in up' 
c:/Users/Jaye/Desktop/inspireboard/db/migrate/20160929074428_add_attachment_image_to_pins.rb:3:in `up' 
c:in `migrate' 
ActiveRecord::StatementInvalid: SQLite3::SQLException: duplicate column name: image_file_name: ALTER TABLE "pins" ADD "image_file_name" varchar 
c:/Users/Jaye/Desktop/inspireboard/db/migrate/20160929074428_add_attachment_image_to_pins.rb:4:in `block in up' 
c:/Users/Jaye/Desktop/inspireboard/db/migrate/20160929074428_add_attachment_image_to_pins.rb:3:in `up' 
c:in `migrate' 
SQLite3::SQLException: duplicate column name: image_file_name 
c:/Users/Jaye/Desktop/inspireboard/db/migrate/20160929074428_add_attachment_image_to_pins.rb:4:in `block in up' 
c:/Users/Jaye/Desktop/inspireboard/db/migrate/20160929074428_add_attachment_image_to_pins.rb:3:in `up' 
c:in `migrate' 
Tasks: TOP => db:migrate 
(See full trace by running task with --trace)

看到上面后，我想跑rake db:drop，但遇到：

Permission denied @ unlink_internal

任何人都可以提出如何工作的在这附近？（注意：我使用的是Windows 8，rails 4.2.5.1，回形针4.3.7）非常感谢！

来源

2016-09-29 CodeMonkey

可能的这个问题的重复：http://stackoverflow.com/questions/16860084/rails-rake-dbreset-not-clearing-my-database或http://stackoverflow.com/questions/38853634/no-permission -to-drop-sqlite3-development-database-rails-5-0-windows- –

[rails 5 db：reset not working]可能重复（http://stackoverflow.com/questions/39182630/rails-5- dbreset-not-working） –

谢谢！我已经成功运行'rake db：reset'，但仍面临着运行'rake db：migrate'的相同问题。有任何想法吗？ – CodeMonkey

删除development.sqlite3文件并重新运行db：migrate解决了问题！

来源

2016-09-30 01:17:07 CodeMonkey

检查是否关闭Rails服务器以运行rake db：drop。我遇到了同样的问题，然后重新安装papperclip。我希望我帮助。

来源

2016-10-31 23:41:01

Rails rake中止！t.sqlite3已存在

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