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POpre save hook: how is the sequence of callbacks in mongoose
 

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  1. POpre save hook: how is the sequence of callbacks in mongoose
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    <p>I would like to increment a counter in my pre save callback. I found this stackoverflow really useful to do so: <a href="https://stackoverflow.com/questions/7334390/has-mongoose-support-findandmodify-mongodb-method">Does Mongoose support the Mongodb `findAndModify` method?</a></p> <p>What I would like to do is use the findAndModify method. But when I implement the statics my squence of callbacks is not as expected. I do always and pre save and then execute findAndModify but I would like do execute findAndModify in between start and end of the pre save hook. If I define a general method with a callback it works as expected. </p> <p>worked also with the done parameter of the pre-save hook without any different result</p> <p>What do I miss here</p> <p>My code looks like this:</p> <pre><code>var mongoose = require('mongoose'); var should = require('should'); mongoose.connect("localhost","test_db"); var CommentSchema = new mongoose.Schema({ content: {type:String}, created_at: {type:Date, default:Date.now}, _post:{type:mongoose.Schema.ObjectId,ref:'Post'} }); var PostSchema = new mongoose.Schema({ title: {type:String}, content: {type:String}, comments: [{type:mongoose.Schema.ObjectId, ref:'Comment'}], counter: {type:Number} }); PostSchema.statics.findAndModify= function(query,sort,doc,options,callback){ return this.collection.findAndModify(query,sort,doc,options,callback); } PostSchema.statics.test_me = function(clb){ console.log("test_me"); clb(); } CommentSchema.pre('save',function(next,done){ console.log("enter pre save comment"); if(this.isNew){ Post.findAndModify({_id:this._post},[],{$inc:{count:1}},{new:true},function(err,post){ console.log("enter find-and-modify!"); console.log(post); }); Post.test_me(function(){ console.log("callback of test_me"); }); console.log("exit pre save comment"); next(); } }); var Post = mongoose.model('Post',PostSchema); var Comment = mongoose.model('Comment',CommentSchema); var post = new Post({title:"hello world"}); var comment = new Comment({content:"1st comment",_post:post}); post.comments.push(comment); var id = post.id; console.log(id); post.save(function(err){ comment.save(function(err){ Post.find({_id:id }) .populate('comments') .exec(function(err,result){ console.log("--------------- result -----------------"); console.log(result); }); }); }); </code></pre> <p>This is the result from my command-line:</p> <pre><code>5049f0d2e21547430a000001 enter pre save comment test_me callback of test_me exit pre save comment enter find-and-modify! { __v: 0, _id: 5049f0d2e21547430a000001, comments: [ 5049f0d2e21547430a000002 ], count: 1, title: 'hello world' } --------------- result ----------------- [ { __v: 0, _id: 5049f0d2e21547430a000001, count: 1, title: 'hello world', comments: [ { content: '1st comment', _post: 5049f0d2e21547430a000001, _id: 5049f0d2e21547430a000002, __v: 0, created_at: Fri Sep 07 2012 15:04:18 GMT+0200 (CEST) } ] } ] </code></pre> <p>EDIT: I do not want to know how to execute findAndModify with test_me in a sequence. I want to know why findAndMody enters after pre-saved is finished. Even it is embedded and should work as demonstrated with the test_me method. So the test_me method should illustrate that a async method should work nested... but findAndModify does not... like my command-line output shows...it always enters findAndModify after pre-save exits even when I use the done() callback...</p>
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