如何使Loopback模型事件起作用? [英] How to make Loopback models events work?

问题描述

我尝试了 http://apidocs.strongloop.com/loopback/#model的示例:

MyModel.on('changed', function(inst) {
  console.log('model with id %s has been changed', inst.id);
  // => model with id 1 has been changed
});

我用实际的型号名称替换了MyModel.当我保存一个新实例或更新一个现有实例时，我希望看到一个控制台日志，但是什么也没有发生.

我如何按照文档中的说明进行操作?

解决方案

当我使用Loopback 3.0而不是2.0时，已弃用了上述侦听器，当我将其更改为以下示例时，它可以正常工作.

>

MyModel.observe('after save', (inst) => {
    console.log('model with id %s has been changed', inst.id);
});

这里是更多信息:

• http://loopback.io/doc/en/lb3/Migrating-to-3.0.html#replace-removed-persistemodel-event-listeners
• http://loopback.io/doc/en/lb2/Operation -hooks.html

I have tried an example from http://apidocs.strongloop.com/loopback/#model:

MyModel.on('changed', function(inst) {
  console.log('model with id %s has been changed', inst.id);
  // => model with id 1 has been changed
});

I replaced MyModel with actual model name. When I save a new instance or update an existing one, I expect to see a console log, but nothing happens.

How do I make it work as it's described in the docs?

解决方案

As I am using Loopback 3.0, not 2.0, the mentioned listener is deprecated and when I changed it to the example below, it helped and works fine.

MyModel.observe('after save', (inst) => {
    console.log('model with id %s has been changed', inst.id);
});

Here is more information:

• http://loopback.io/doc/en/lb3/Migrating-to-3.0.html#replace-removed-persistemodel-event-listeners
• http://loopback.io/doc/en/lb2/Operation-hooks.html

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