Plugin beforeDefine option #263

function Plugin (db) {
    return {
        // This uses the properties and opts passed into the Model constructor.
        beforeDefine: function (name, properties, opts) {
            // Now we can intercept and add the methods we want.
            if (!Array.isArray(opts.visible)) {
                return;
            }

            opts.methods = opts.methods || {};
            opts.methods.toJs = function () {
                // Code to filter model instance fields based on the fields provided in the opts.visible Array
            };
            opts.methods.toJson = function () {
                return JSON.serialize(opts.methods.toJs());
            };
        }
    };
}