⚡ Fix N+1 Query in UserReward and UserAchievement serialization#1
⚡ Fix N+1 Query in UserReward and UserAchievement serialization#1
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…vement serialization - Updated `UserAchievement.to_dict()` and `UserReward.to_dict()` to use relationship attributes instead of manual `Query.get()` calls. - Implemented eager loading in `app/main.py` using `joinedload` for the `get_profile` route. - This change reduces the number of database queries from N+1 to a constant number when fetching user profiles with multiple achievements and rewards. Co-authored-by: Qnh233 <[email protected]>
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💡 What:
Optimized the serialization of
UserRewardandUserAchievementmodels to eliminate N+1 query patterns.🎯 Why:
The previous implementation of
to_dict()in these models calledReward.query.get()andAchievement.query.get()for each item, leading to a new database query for every achievement or reward associated with a user. This significantly degraded performance as the number of items grew.📊 Measured Improvement:
Using a mock benchmark, the number of database queries for serializing 20 items was reduced from 20 to 0 (when pre-loaded with
joinedload). In the actual application, this means theget_profileroute now performs a single joined query instead of separate queries for each achievement and reward.joinedload.Files modified:
app/database/models.py: Changedto_dictlogic to use relationships.app/main.py: Addedjoinedloadtoget_profilequeries and fixed the import.PR created automatically by Jules for task 17776605495112476306 started by @Qnh233