Fixing Extending in Models Base

app/models/Base.js

@@ -1,10 +1,13 @@
+var util = require('util');
 module.exports = function(db) {
 	this.db = db;
 };
 module.exports.prototype = {
 	extend: function(properties) {
-		var Child = module.exports;
-		Child.prototype = module.exports.prototype;
+		var Child = function(db) {
+			this.db = db;
+		};
+		util.inherits(Child, module.exports);
 		for(var key in properties) {
 			Child.prototype[key] = properties[key];
 		}

app/tests/base.model.spec.js

@@ -14,7 +14,22 @@ describe("Models", function() {
 		});
 		var model2 = new OtherTypeOfModel(dbMockup);
 		expect(model2.db).toBeDefined();
+		expect(model2.setDB).toBeDefined();
 		expect(model2.myCustomModelMethod).toBeDefined();
 		next();
-	})
+	});
+	it("should not modify the base prototype chain", function(next) {
+		var model = new Model(dbMockup);
+		var A = model.extend({
+			prop: 20
+		});
+		var B = model.extend({
+			prop: 30
+		});
+		var a = new A();
+		var b = new B();
+		expect(a.prop).toBe(20);
+		expect(b.prop).toBe(30);
+		next();
+	});
 });

app/tests/base.view.spec.js

@@ -25,4 +25,18 @@ describe("Base view", function() {
 		expect(otherViewInstance.render).toBeDefined();
 		otherViewInstance.render({prop: 'yes'});
 	});
+	it("should not modify the base prototype chain", function(next) {
+		var v = new View();
+		var A = v.extend({
+			prop: 20
+		});
+		var B = v.extend({
+			prop: 30
+		});
+		var a = new A();
+		var b = new B();
+		expect(a.prop).toBe(20);
+		expect(b.prop).toBe(30);
+		next();
+	});
 });

app/views/Base.js

@@ -1,11 +1,15 @@
+var util = require('util');
 module.exports = function(response, template) {
 	this.response = response;
 	this.template = template;
 };
 module.exports.prototype = {
 	extend: function(properties) {
-		var Child = module.exports;
-		Child.prototype = module.exports.prototype;
+		var Child = function(response, template) {
+			this.response = response;
+			this.template = template;
+		};
+		util.inherits(Child, module.exports);
 		for(var key in properties) {
 			Child.prototype[key] = properties[key];
 		}