Flask - Performance Optimization
What is the primary purpose of using
joinedload() in Flask SQLAlchemy queries?What is the primary purpose of using joinedload() in Flask SQLAlchemy queries?
easy📝 Conceptual Q1 of 15
Step-by-Step Solution
Solution:
Step 1: Understand what
joinedload()doesjoinedload()is used to load related objects in the same database query using a SQL JOIN, reducing the number of queries.Step 2: Compare with other options
Filtering results, pagination, and session creation are unrelated tojoinedload().Final Answer:
To optimize queries by loading related objects in a single query -> Option BQuick Check:
Query optimization with eager loading = A [OK]
Quick Trick: Use joinedload() to fetch related data in one query [OK]
Common Mistakes:
MISTAKES- Confusing joinedload() with filter()
- Thinking joinedload() paginates results
- Assuming joinedload() creates sessions
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