SQLite3 :: ConstraintException：FOREIGN KEY约束失败：DROP TABLE用户

Question

如何在 DROP TABLE 之前禁用（我还不知道正确的术语）外键？ OR

删除表格的正确方法？

按照提供的here

步骤进行操作

Image link

再次出现相同的错误 SQLite3 :: ConstraintException：FOREIGN KEY约束失败：DROP TABLE用户。

(byebug) execute "PRAGMA foreign_keys = OFF"
-- execute("PRAGMA foreign_keys = OFF")
   -> 0.0009s
[]
(byebug) execute "DROP TABLE users"
-- execute("DROP TABLE users")
*** ActiveRecord::InvalidForeignKey Exception: SQLite3::ConstraintException: FOREIGN KEY constraint failed: DROP TABLE users

nil

Answer 1

假设您的用户与posts表相关联，然后创建迁移并删除

class RemoveForeignKey < ActiveRecord::Migration
  def change
    # remove the old foreign_key
    remove_foreign_key :posts, :users
  end
end