KITFORMA · EDITORIAL GUIDE
How do I detect an N+1 query problem in a list endpoint?
KitForma editorial guide. An endpoint can run one list query and then one extra query per row for related data. It works on small fixtures but scales with the number of results.
Step-by-step guidance
An endpoint can run one list query and then one extra query per row for related data. It works on small fixtures but scales with the number of results.
Count database calls for page sizes one, ten and fifty, then batch related lookups or use an appropriately shaped join. Test the returned row count and aggregates because eager joins can multiply rows. Select only necessary fields and keep pagination at the intended parent level. Query reduction is not automatically a speedup if it creates a huge Cartesian result; compare latency, transferred bytes and memory.
Sources and verification
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