Can't access ring-specific attributes on a cached property

[striveforbest]

I am writing a reports/calculations module and using ring to store the results of expensive calculations in redis. I started with using classmethods and it worked as expected, I was able to access ring-specific attributes (has, key, etc) but with property I cannot seem to be able to.

Here is a simplified example:

from django_redis import get_redis_connection


redis_connection = get_redis_connection('default')


class ProductCalculations:
    """
    Generate business intelligence from an organizations Product data.
    """

    def __init__(self, organization):
        self.organization = organization

    def __ring_key__(self):
        """ Required for setting a correct cache key. """
        return self.organization

    @ring.redis(redis_connection, coder='pickle')
    @property
    def products(self) -> 'QuerySet[Product]':
        return Product.objects.filter(organization=self.organization)

    @ring.redis(redis_connection, coder='pickle')
    @property
    def product_count(self) -> int:
        return self.products.count()

Upon inspecting the results, I can't seem to be able to access ring-specific attributes:

org = Organization.objects.all()[0]

calc = ProductCalculations(org)
calc.products

calc.products.has(o)

AttributeError: 'QuerySet' object has no attribute 'has'

Is this an expected behavior? How can I access ring-specific attributes on the cached property?

[youknowone]

Yes, it is an expected behavior. We need Ring object to access to the ring attributes, but property returns the result of function instead of ring object.

Not very neat, but I sometimes used this kind of workaround for development:

class ProductCalculations:
    @ring.redis(redis_connection, coder='pickle')
    def _products(self) -> 'QuerySet[Product]':
        return Product.objects.filter(organization=self.organization)

    @property
    def products(self):
        return self._products()

There is no way to access there for now. Maybe we need a tool like, ring.obtain(ProductCalculations, calc, 'products')

[striveforbest]

That's what I suspected. Thanks for the proposed workaround @youknowone . Something like obtain_ring function would be really handy. Hoping to see it in the future.

[striveforbest]

@youknowone so if it's a property and I don't have access to ring methods, how do I force the recache? I do need access to .update() and, potentially, .delete(). Sometimes I know the code/logic changed and I need to recache otherwise i'd be getting stale results. But Ring just returns stored/stale results because the key exists.