Question

My django + SQLAlchemy app uses cdecimal instead of the default decimal module.
I followed the instructions on SQLAlchemy’s website:

import sys
import cdecimal
sys.modules["decimal"] = cdecimal 

Using the same from a previous stackoverflow thread, I am able to add the data to the DB. However, when I retrieve an entry from my table and look at its value, the type of value returned to me is actually decimal.Decimal rather than cdecimal.Decimal.

How do I tell SQLAlchemy to give me back cdecimal.Decimal objects when entries are retrieved?

Thanks!

Answer 1

The solution here is to put this code

import sys
import cdecimal
assert "sqlalchemy" not in sys.modules
assert "decimal" not in sys.modules
sys.modules["decimal"] = cdecimal

In the manage.py file, rather than the models.py file. This ensures that cdecimal is really replacing decimal from the beginning.