Sample mongoose plugin

mongoose-plugin-update.js

module.exports = exports = function mongoosePluginRestaurant (schema, options) {
    schema.pre('save', function (next) {
        if (this.isModified('description')) {
            this.descriptionUpdated = new Date;
        }
        if(this.isModified())
            this.updated = new Date;
        next()
    });
};