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PO_id in sub-objects in a mongodb document (using Mongoose)
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  1. PO_id in sub-objects in a mongodb document (using Mongoose)
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    copied!<p>I am creating a structure like this in Mongoose:</p> <pre><code>var Access = new Schema({ userId : { type: ObjectId, unique: true }, key : { type: String, index: true }, isOwner : { type: Boolean, index: true }, }); mongoose.model('Access', Access); var Workspace = new Schema({ name : { type: String, lowercase: true, unique: true}, activeFlag : Boolean, settings : { welcomeMessage : String, invoiceTemplate : String, longName : String, defaultCountry : String, countryId : { type: ObjectId, index: true }, }, access : [ Access ], }); mongoose.model('Workspace', Workspace); </code></pre> <p>After adding some documents, I see the result:</p> <pre><code>{ "activeFlag" : true, "name" : "w7", "_id" : ObjectId("5036131f22aa014c32000006"), "access" : [ { "user": "merc", "key" : "673642387462834", "isOwner" : true, "_id" : ObjectId("5036131f22aa014c32000007") } ], "__v" : 0 } </code></pre> <p>I am confused by that <code>_id</code> in the sub-document, which doesn't seem to happen if I add just it as a sub-structure rather than a sub-schema. So questions:</p> <p>1) Where does that <code>_id</code> come from? Is Mongoose's driver doing it? If so, how can I reach the same behaviour using straight Mongodb? Just by adding an ObjectId field?</p> <p>2) When would you use a sub-document, and when would you use just a data structure?</p> <p>3) I haven't gotten started with the serious part of my web application yet. However, wouldn't that ID there be <em>really</em>, and I mean <em>really</em> useful in case you are allowing JsonRest access to a sub-record in a document for example?</p> <p>Thank you as ever!</p> <p>Merc.</p>
 

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