Schema instance methods referencing this.find, this.findOnce, etc. throws

Hi,

The following

var mongoose = require('mongoose')
  , CarSchema
  , Car

mongoose.connect('mongodb://localhost/bug_or_feature');

CarSchema = new mongoose.Schema({ reg: Number });
CarSchema.methods.byReg_FAILING = function (reg, fn) {
  this.find({ reg: reg }, fn);
};
CarSchema.methods.byReg = function (reg, fn) {
  Car.find({ reg: reg }, fn);
};
Car = mongoose.model('Car', CarSchema);

var c = new Car();
c.byReg_FAILING('666');
c.byReg('1337');

mongoose.disconnect();

Produces

$ node mongoose-test.js

node.js:201
        throw e; // process.nextTick error, or 'error' event on first tick
              ^
TypeError: Object { _id: 4f5f67d498d17ca168000001 } has no method 'find'
    at model.byReg_FAILING (/home/torgeir/code/mongoose-test.js:9:8)
    at Object.<anonymous> (/home/torgeir/code/mongoose-test.js:17:3)
    at Module._compile (module.js:441:26)
    at Object..js (module.js:459:10)
    at Module.load (module.js:348:31)
    at Function._load (module.js:308:12)
    at Array.0 (module.js:479:10)
    at EventEmitter._tickCallback (node.js:192:40)

Reading docs and the example my impression was that both of CarSchema’s instance methods should be working?

Changing this.find for this.db.model('Car').find, however, seems to be working.

Regards, Torgeir

[chenzihui]

Encountered the same problem as well.

Seems to work when you just use this.model('Car').find as well.

[RachelScodes]

@varunjayaraman

instances should NOT have the .find property on them. That is a schema-level method. This functionality is intentional.

This ticket was opened a while ago. As of the last time I checked, they now do correctly show that when using find on an instance method it should be invoked as this.Model.find, aka calling find on the class, not the instance, which makes total sense.

Docs: http://mongoosejs.com/docs/guide.html#methods