I feel you, figuring out such errors for the first time can be infinitely
frustrating.
I believe that the form is sending you product id numbers as strings, or 1 as
‘1’.
If the product_id = ‘1’ then product_id is not None.
However, you have defined product_id in the model for Product as an int and
it’s raising a TypeError because you’re searching for a product_id that is a
string instead.
To fix the problem, convert the result from the POST request from a string into
an int.
After you check if product_id is not None:
product_id = int(product_id)
Regards,
Alejandro Peña
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