ive been trying to hack away and figure out how to solve this on my own for a few hours but i can’t seem to think of an elegant solution for this. I was wondering if anyone can help.
Heres the model layout (example)
Model A:
candyBarChoices
Model B:
snackLog
Ok so basically the dilemma is this. In the database there are about 15 candy bar choices. Every day when the user logs what they ate, they choose a candy bar. My question is, what is an efficient way to “tally” up each of the candy bar choices given a set of snack logs?
For example: if i provided a QuerySet of 15 snack logs, sometimes the user could have ate multiple candy bars on that day and therefore each snack log could have multiple candy bars. How can i run through this query set and create a compiled data set of the total number of a certain candy bar they ate?
I’ve come up with multiple really messy solutions using dictionaries, etc. But none of them work without screwing up .. help please.
You should post actual models to help clarify your setup. It looks like you’re trying to aggregate over a model instance’s related objects. If so, look at the docs on QuerySet aggregation.