Extending Classes

Introduction
It's common to want to use a Service Provider to add new methods to a class. For example, you may want to add a is_authenticated method to the Request class. Your package and Service Provider may be for a better authentication system.
You may easily extend classes that inherit from the Extendable class. Many of the built in classes inherit from it.
Usage
You have a few options for adding methods to any of the core classes. You can extend a class with functions, classes and class methods. Typical usage may look like:
def is_authenticated(self):
    return self
​
def show(self, request: Request):
​
    request.extend(is_authenticated)
​
    print(request.is_authenticated()) # returns the Request class
Usage is very simple and has several options for extending a class. Notice that we don't call the function but we pass the reference to it.
Extending a function
This will simply add the function as a bound method to the Request class
def is_authenticated(self):
    return self
​
def show(self, request: Request):
​
    request.extend(is_authenticated)
​
    print(request.is_authenticated()) # returns the Request class
Extending a class method
We can also extend a class method which will take the method given and add it as a bound method.
class Authentication:
​
    def is_authenticated(self):
        return self
​
def show(self, request: Request):
​
    request.extend(Authentication.is_authenticated)
​
    print(request.is_authenticated()) # returns the Request class
Extending a class
We can even extend a whole class which will get all the classes methods and create bound methods to the Request class.
class Authentication:
​
    def is_authenticated(self):
        return self
​
    def login(self):
        return self
​
def show(self, request: Request):
​
    request.extend(Authentication)
​
    print(request.is_authenticated()) # returns the Request class
    print(request.login()) # returns the Request class

Last modified 5yr ago