Adding 'virtual' variables to a mongoose schema?

Question

I have the following document schema:

var pageSchema = new Schema({       name: String     , desc: String     , url: String }) 

Now, in my application I would like to also have the html source of the page inside the object, but I do not want to store it in the db.

Should I create a "local" enhanced object which has a reference to the db document?

function Page (docModel, html) {     this._docModel = docModel     this._html = html } 

Is there a way to use the document model directly by adding a "virtual" field?

Answer 1

This is perfectly possible in mongoose.
Check this example, taken from their documentation:

var personSchema = new Schema({   name: {     first: String,     last: String   } });  personSchema.virtual('name.full').get(function () {   return this.name.first + ' ' + this.name.last; }); console.log('%s is insane', bad.name.full); // Walter White is insane 

In the above example, the property would not have a setter. To have a setter for this virtual, do this:

personSchema.virtual('name.full').get(function () {   return this.name.full; }).set(function(name) {   var split = name.split(' ');   this.name.first = split[0];   this.name.last = split[1]; }); 

Documentation