prevent premature query with no_autoflush to catch name exception #26
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WalkthroughWrapped subcategory assignment in CategoryById.put with db.session.no_autoflush to prevent autoflush during fetch-and-assign of Subcategory records. Logic remains: resolve provided subcategory IDs, abort with 422 if any missing, then extend the category’s subcategories. No public API or error handling changes beyond the autoflush context. Changes
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app/routes/category.py (1)
101-107: Consider extracting subcategory validation logic.The subcategory validation logic (lines 101-107) is nearly identical to the POST method's validation (lines 56-61). Consider extracting this into a helper method to reduce duplication and improve maintainability.
Example refactor:
@staticmethod def _validate_and_fetch_subcategories(sc_ids): """Validate and fetch subcategories by IDs.""" subcategories = Subcategory.query.filter(Subcategory.id.in_(sc_ids)).all() if len(subcategories) != len(sc_ids): abort(422, message="One or more subcategories not present") return subcategoriesThen use in both POST and PUT:
if sc_ids := data.get("subcategories"): subcategories = CategoryCollection._validate_and_fetch_subcategories(sc_ids) category.subcategories = subcategories # or extend, after fixing the PUT semantics issue
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app/routes/category.py (1)
app/models.py (1)
Subcategory(93-110)
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app/routes/category.py (1)
100-107: Good use ofno_autoflushto defer integrity checks.The
no_autoflushcontext correctly prevents premature flushing during the subcategory query and assignment. Whencategory.nameis modified (line 98), the category becomes dirty and could trigger an autoflush during the subcategory query (lines 102-104), causing a name uniqueness violation to be raised before reaching the try/except block. By deferring the flush until the explicit commit (line 110), allIntegrityErrorcases are properly handled in one place.
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