使用事務around_create回調

Question

我有一個情況我需要「do_this」「富」後，已成功創建和「do_that」當「do_this」已經沒有錯誤執行，就像這樣：

class Foo < ActiveRecord::Base 

    around_create do |foo, block| 
    transaction do 
     block.call # invokes foo.save 

     do_this! 
     do_that! 
    end 
    end 

    protected 

    def do_this! 
    raise ActiveRecord::Rollback if something_fails 
    end 

    def do_that! 
    raise ActiveRecord::Rollback if something_else_fails 
    end 

end 

如果其中一個失敗，整個事務應該回滾。

然而，問題在於，即使'do_this'或'do_that'失敗，'foo'也會一直存在。是什麼賦予了？

Answer 1

你不需要這樣做，如果你返回false到回調，它會觸發回滾。最簡單的方法來編寫你想要的是像這樣

after_save :do_this_and_that 

def do_this_and_that 
    do_this && do_that 
end 

def do_this 
    # just return false here if something fails. this way, 
    # it will trigger a rollback since do_this && do_that 
    # will be evaluated to false and do_that will not be called 
end 

def do_that 
    # also return false here if something fails to trigger 
    # a rollback 
end