Decorator with Instance Attribute Argument for Class Methods
Question
Could you assist me with passing a class field to a class method decorator as an argument? Specifically, what I'm trying to achieve is the following:
class Client:
def __init__(self, url):
self.url = url
@check_authorization("some_attr", self.url)
def get(self):
do_work()
However, I'm encountering an error indicating that "self" does not exist when attempting to pass "self.url" to the decorator. Is there a solution to this issue?
Solution
Certainly. Here's a way you can accomplish your desired behavior:
Instead of specifying the instance attribute during class definition, you can evaluate it dynamically at runtime:
def check_authorization(f):
def wrapper(*args):
print(args[0].url)
return f(*args)
return wrapper
class Client:
def __init__(self, url):
self.url = url
@check_authorization
def get(self):
print('get')
>>> Client('http://www.google.com').get()
http://www.google.com
get
The decorator captures the method's parameters. The first parameter refers to the instance, and you access the attribute from it.
You can also provide the attribute name as a string to the decorator and use "getattr" if you prefer not to hardcode it:
def check_authorization(attribute):
def _check_authorization(f):
def wrapper(self, *args):
print(getattr(self, attribute))
return f(self, *args)
return wrapper
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