Mongoose 用于 create() 而不是 update() 的后挂钩

Question

Maybe I'm misunderstanding, but everything I can find for having a post hook for create() on a mongoose model brings up the update() method instead. Are create() and update() the same?

What I want to do is when a User document is created, send a welcome email, without having to manually call the method on every route/controller that creates a user.

I understand a little about pre- and post- hooks, and I have a pre-remove hook:

userSchema.pre('remove', async function() {
    for (let response of this.responses) {
        Response.findByIdAndRemove(response);
    };
});

But I can't find anything within mongoose docs for a post-hook for create() .

If create() and update() are the same, what stops this welcome email from being sent any time the user's information is changed? I only want this to send once, at the very beginning.

Let me know if I'm clear as mud

Answer 1

I found the answer, finally, in the Mongoose docs in a roundabout way through a github feature request: schema.queue : http://mongoosejs.com/docs/api.html#schema_Schema-queue

So I define the method (s) that I want to execute at the time the document is instantiated, then just use the schema.queue command like so:

schema.queue('methodName',[args]);

For the time being, I left the args array empty because they're only operating on themselves, so no other information needs to go in.

The docs don't say it specifically, but I would assume since declaring methods looks to be the same as declaring any function, the queue method can be called before or after declaring the method it calls, but I played it safe and put it after.

Man, this is exciting.