overriding

I have looked around and could not find any similar question. Here is the paragraph I got from Wikipedia : Polymorphism is not the same as method overloading or method overriding. Polymorphism is only concerned with the application of specific implementations to an interface or a more generic base class. Method overloading refers to methods that have the same name but different signatures inside the same class. Method overriding is where a subclass replaces the implementation of one or more of its parent's methods. Neither method overloading nor method overriding are by themselves

I would like to do the above. Ive overridden many files in the past...block, model, helper....but this one eludes me. Can anyone see what im doing wrong here: (ive edited this code...to include some of the recomendations now...) Heres my folder structure (2 controller locations as a test): /Idigital/Idgeneral/etc/config.xml /Idigital/Idgeneral/controllers/Checkout/CartController.php /Idigital/Idgeneral/controllers/CartController.php Heres my config.xml: <?xml version="1.0"?> <config> <modules> <idigital_idgeneral> <version>0.1.0</version> </idigital_idgeneral> </modules> <global> <blocks>

Suppose i have : class Album(models.Model): photos = models.ManyToManyField('myapp.Photo') photo_count = models.IntegerField(default = 0) class Photo(models.Model): photo = models.ImageField(upload_to = 'blahblah') What is want is, everytime i call .add() method, increment the photo_count on Album class, so i'm thinking to override .add() method. The problem is, i can't import the .add() 's class since it is inside a method, so it is like def->class->def . So is there anyway to override .add() ? Or there is a better way to do this? You can use django's signals and write a signal handler that

If I have this function, what should I do to replace the inner function with my own custom version? def foo(): def bar(): # I want to change this pass # here starts a long list of functions I want to keep unchanged def baz(): pass Using classes this would be easily done overriding the method. Though, I can't figure out how to do that with nested functions. Changing foo to be a class (or anything else) is not an option because it comes from a given imported module I can't modify. Here's one way of doing it, creating a new foo that "does the right thing" by hacking the function internals. ( As

Update : This question has been revised to make it clearer. The answers below seem to reflect that this method works well. Hopefully this question can help people who need to add a get or set to an existing property. Ran into a problem today where I needed to override a base class's get -only property with both a get and set . Current consensus seems to be that this is impossible, but I think that I found a method. The general idea is to make a new property instead of directly override ing the old one, then we create a bridge method that override s the old get method with a call to the new one

I want to get the implementation class name from my interface object — is there any way to do this? I know I can use instanceof to check the implementation object, but in my application there are nearly 20 to 30 classes implementing the same interface to override one particular method. I want to figure out which particular method it is going to call. Just use object.getClass() - it will return the runtime class used implementing your interface: public class Test { public interface MyInterface { } static class AClass implements MyInterface { } public static void main(String[] args) {