停止 AASM 过渡的最佳方法是什么
当成功调用的方法或进入状态转换阶段抛出错误时，捕获此错误并确保状态恢复到先前状态的最佳方法是什么。
我正在使用 AASM 宝石。
When a method being called in the success or enter phases of a state transition throw errors, what is the best way to catch this and ensure that the state reverts back to the previous state.
I'm using the AASM gem.
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如何使用 :guard 选项来确保可以执行转换？ 如果防护方法返回 false，则根本不会执行转换。 因此，我首先检查守卫方法是否满足转换的每个条件。
What about using the :guard option to make sure the transition can be performed? If the guard method returns false, the transition isn't executed at all. So, I'd check if every condition of the transition is met with the guard method, first.
我没有使用过这个插件，但阅读了代码，除非我弄错了，否则似乎没有任何机制来传达这些回调失败的情况。
对于我来说，这对于
success回调来说是完全有意义的，因为只有在转换实际发生时才会调用它，到那时就已经来不及恢复了。 如果您希望在success回调中引发异常以阻止转换，也许代码应该放入转换本身而不是success回调中......？ 或者也许你需要一个额外的状态......？关于
enter回调，guard回调不是更合适吗...？ 如果转换不应该继续，您可以返回 false。I've not used this plugin, but reading the code, unless I'm mistaken there doesn't appear to be any mechanism for communicating that either of these callbacks have failed.
This makes complete sense to me for the
successcallback, because it is only called once the transition has actually happened by which time it is too late to revert. If you want the exception raised within yoursuccesscallback to prevent the transition, perhaps the code should go in the transition itself and not in thesuccesscallback...? Or maybe you need an extra state...?Regarding the
entercallback, would theguardcallback not be more appropriate...? You can return false if the transition should not go ahead.