从猫鼬模式调用自定义方法

Question

I made custom methods with two ways, But not working.

models

...
// I read it from other stack overflow QA
categorySchema.methods.postChange = function(){
console.log('postChange');
};

// Mongoose reference doc
categorySchema.methods('postChange', function(){
console.log('postChange');
});

var Category = mongoose.model('category',categorySchema);

module.exports = Category;

routes

...
router.post('/update_cat', upload.single('image_file'), function(req, res){
Category.findOneAndUpdate({name: req.body.name}, {href: req.body.href}, function(err, doc){
    doc.href = req.body.href;
    Category.postChange();
    (err)?res.json(err):res.redirect('./reg_line');
    });
});

and The error is 'Category.postChange is not a function'.

Answer 1

It is not advisable to put your function in the models but you should define them in the routes itself. Models are for your mongoose schema. Just in case, you are getting this error because you are not exporting the function.

exports.categorySchema.methods.postChange = function(){
     console.log('postChange');
};

or

exports.categorySchema.methods('postChange', function(){
     console.log('postChange');
});

Answer 2

You can set the function as static with this code :

// Mongoose reference doc
categorySchema.statics.postChange = function(){
    console.log('postChange');
};

module.exports = mongoose.model('category',categorySchema);

Documentation : http://mongoosejs.com/docs/guide.html#statics