Rspec的与database_cleaner在续集导致外键截断误差

Question

我正在与DatabaseCleaner RSpec的测试，以下续集车型

class User < Sequel::Model 
     one_to_many :memberships 
     many_through_many :accounts, [[:memberships, :user_id, :account_id]] 
end 

class Account < Sequel::Model 
     one_to_many :memberships 
     many_through_many :users, [[:memberships, :user_id, :account_id]] 
end 

class Membership < Sequel::Model 
     many_to_one :account 
     many_to_one :user 
end 

当我运行测试，我得到以下错误：

An error occurred in a `before(:suite)` hook. 
Failure/Error: DatabaseCleaner.clean_with(:truncation) 

Sequel::DatabaseError: 
    Mysql2::Error: Cannot truncate a table referenced in a foreign key constraint (`account_users`.`memberships`, CONSTRAINT `memberships_ibfk_2` FOREIGN KEY (`account_id`) REFERENCES `account_users`.`accounts` (`id`)) 

我DatabaseCleaner设置是：

config.before(:suite) do 
    DatabaseCleaner.strategy = :transaction 
    DatabaseCleaner.clean_with(:truncation) 
    end 

DatabaseCleaner应取消设置在截断之前设置关键限制，就像ActiveRecord那样，它可以正常工作。

我的问题是：这是一个DatabaseCleaner-Sequel错误还是它与我的使用续集many_through_many插件？

Answer 1

好的，这是一个开放的issue with DatabaseCleaner。解决方法是在截断并在之后重新启用它们之前禁用引用密钥约束。

用MySQL，这将是这样的：

DB.run('SET FOREIGN_KEY_CHECKS=0;') 
DatabaseCleaner.clean_with(:truncation) 
DB.run('SET FOREIGN_KEY_CHECKS=1;')