mongoose Model.findOne TypeError: Object has no method 'findOne'

Question

I have a simple node.js code that uses mongoose which works when saving but doesn\'t retrieve.

.save() works, but .findOne() doesn\'t.

Answer 1

To elaborate on the current answer which is correct, notice the difference between userSchema.path and userSchema.statics - the former uses 'this' as the instance of the model, while in the latter 'this' refers to the model "class" itself:

       var userSchema = ...mongoose schema...;

       var getUserModel = function () {
            return mongoDB.model('users', userSchema);
        };


       userSchema.path('email').validate(function (value, cb) {
                getUserModel().findOne({email: value}, function (err, user) {
                    if (err) {
                        cb(err);
                    }
                    else if(user){  //we found a user in the DB already, so this email has already been registered
                        cb(null,false);
                    }
                    else{
                        cb(null,true)
                    }
                });
            },'This email address is already taken!');


     userSchema.statics.findByEmailAndPassword = function (email, password, cb) {
                this.findOne({email: email}, function (err, user) {
                    if (err) {
                        return cb(err);
                    }
                    else if (!user) {
                        return cb();
                    }
                    else {
                        bcrypt.compare(password, user.passwordHash, function (err, res) {
                            return cb(err, res ? user : null);
                        });
                    }

                });

            };

        };

Answer 2

findOne is a method on your Users model, not your user model instance. It provides its async results to the caller via callback:

Users.findOne({field:'value'}, function(err, doc) { ... });