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copied!<p>I am posting what fixed my casting to objectId. It is the story of updatedBy key of my features document. I added some comments to show you the problematic area corresponds to the casting issue. </p> <p>import mongoose;</p> <pre><code> var mongoose = require('mongoose'); </code></pre> <p>define objectId;</p> <pre><code> var ObjectId = mongoose.Schema.Types.ObjectId; </code></pre> <p>define the type in your schema;</p> <pre><code> var featureSchema = new Schema({ name: String, isSystem: { type: Number, min: 0, max: 1 }, updatedBy: {type:ObjectId, ref:'users'}, //here I defined the field! updatedAt: { type: Date, default: Date.now } }); </code></pre> <p>and then insert the document via post method;</p> <pre><code> app.post('/features', function (req, res){ var feature; console.log("POST: "); console.log(req.body); feature = new Feature({ name: req.body.name, isSystem: req.body.isSystem, updatedBy: req.body.updatedBy, //here I insert the objectId field updatedAt: new Date() }); feature.save(function (err) { if (!err) { return console.log("created"); } else { return console.log(err); } }); return res.json({ features: feature }); }); </code></pre> <p>and finally this is your json string. you can fire it from google chrome javascript console or a similar one;</p> <pre><code> jQuery.post("/features", { "name": "Receipt", "isSystem": 0, "updatedBy": "528f3d44afcb60d90a000001" },function (data, textStatus, jqXHR) { console.log("Post resposne:"); console.dir(data); console.log(textStatus); console.dir(jqXHR); }); </code></pre>

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