Is there a way to track changes to model on after_commit when a record is created? I have tried using dirty module and was able to track changes when the record was updated, but when record is created changes are not recorded.
有没有办法在创建记录时跟踪after_commit上的模型更改？我尝试过使用脏模块，并且能够在更新记录时跟踪更改，但是在创建记录时，不会记录更改。
1 个解决方案
#1
45
You can't use the rails changed? method, as it will always return false. To track changes after the transaction is committed, use the previous_changes method. It will return a hash with attribute name as key. You can can then check if your attribute_name is in the hash:
你不能使用导轨改变？方法，因为它总是返回false。要在提交事务后跟踪更改，请使用previous_changes方法。它将返回一个带有属性名称作为键的哈希。然后，您可以检查您的attribute_name是否在哈希中：
after_commit :foo
def foo
if previous_changes[attribute_name]
#do your task
end
end
#1
45
You can't use the rails changed? method, as it will always return false. To track changes after the transaction is committed, use the previous_changes method. It will return a hash with attribute name as key. You can can then check if your attribute_name is in the hash:
你不能使用导轨改变？方法，因为它总是返回false。要在提交事务后跟踪更改，请使用previous_changes方法。它将返回一个带有属性名称作为键的哈希。然后，您可以检查您的attribute_name是否在哈希中：
after_commit :foo
def foo
if previous_changes[attribute_name]
#do your task
end
end