fix(rules): gate DOL007 on the loop source, not the attribute name - #74
fix(rules): gate DOL007 on the loop source, not the attribute name#74Nitjsefnie wants to merge 7 commits into
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DOL007 fired on loops over model *classes* (e.g. apps.get_models()) reading a plain class attribute like `model.ANONYMISE_AFTER`. That is an in-memory MRO lookup, not a query, and select_related() / prefetch_related() have nothing to act on. Skip attribute names in UPPER_SNAKE_CASE, which denote class-level constants rather than fields or relations. Fixes FROWNINGdev#72 Co-Authored-By: Kimi K3 <noreply@kimi.com>
The previous commit skipped UPPER_SNAKE attribute names. That keyed on the wrong thing twice over: FROWNINGdev#72 is about the loop *source* — a loop over model classes — so `model.objects.filter(...)`, `model.Meta` and `except model.DoesNotExist:` in the reporter's own sweep still reported an N+1, while `order.CUSTOMER` on a real queryset stopped reporting, because Django permits uppercase field names. Gate the loop head instead: a chain is in scope only when it roots at `<Model>.objects.…` or begins with a queryset-producing method. This is the scope gate the CLI's nplusone analyzer already applies in `_process_loop` (cli/django_orm_lens/query_analyzer.py), and loops over ranges, lists and model classes drop out together. A bare name (`for user in users:`) keeps its current behaviour — it names no call, so it is evidence neither way, and the AST binding tracker the CLI resolves it with has no line-oriented equivalent. Fixes FROWNINGdev#72 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…-call boundary The two implementations gate loop sources with the same shape but do not agree in every case: the nplusone analyzer resolves helper returns (so `for p in recent():` and `for o in self.get_queryset():` still report there), while the line-oriented rule cannot; and a bare name (`for user in users:`) reports here but only there when the AST binding tracker has bound the name. Say so in the changelog and the rule doc instead of claiming agreement. Also pin the boundary with a test: helper-call loop sources produce no DOL007 finding. Co-Authored-By: Kimi K3 <noreply@kimi.com>
…y show The correction in the previous commit traded one wrong claim for another: it said a bare-name loop head reports in the extension and not in the CLI. Running both engines over one probe file shows `users = User.objects.all()` followed by `for u in users:` — the idiom that sentence names — reported by both, because the analyzer's tracker binds the name to that chain. The divergence is narrower: only a bare name the tracker cannot bind to a queryset — a parameter, an import, or a name assigned anything else, a helper call included even when the helper returns a queryset — reports in the rule and not in the analyzer. The changelog entry and the rule doc now say that, and the "mirrors the source gate" comment in src/rules/queryset.ts, which restated the old claim a third time, says it too. DOL007.md also explained the skipped helper call by saying such loops "iterate ranges, lists or model classes", contradicting the paragraph above it: a helper call is skipped because the call name is no evidence and resolving it needs an AST this rule does not have. Both lines now say what they mean, with the missed helper-call N+1 named as the cost. Comment and prose only; no rule logic changes. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The DOL007 scope prose compared the rule against the CLI's N+1 analyzer. Every version of that comparison has been wrong about some case, because the two engines differ in more places than a paragraph can carry. Drop the comparison everywhere it appears in this change — the changelog entry, the DOL007 rule page, the `QS_SOURCE_METHODS` and `mayIterateQuerySet` docblocks, the DOL007 docblock, and a test comment — and state the predicate instead: a loop source containing no `(` is in scope; one that does is in scope only when the text before that first `(` is `<Model>.objects.<method>` or a dotted chain ending in a queryset-producing method. Every remaining sentence is checkable by reading `mayIterateQuerySet`. Prose only. No behaviour changes, no tests added or removed. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughDOL007 now gates loop analysis on recognized queryset-producing sources. It skips arbitrary calls and model-class iteration while preserving bare names, dotted attributes, and valid queryset chains. Documentation, changelog entries, and regression tests describe and verify the behavior. ChangesDOL007 queryset source gating
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to The change can still miss DOL007 findings for common QuerySet loops using chained calls or select_related()/prefetch_related(), so affected code may pass without the intended warning. Merge should wait until these supported QuerySet sources are handled and covered by regression tests. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@src/rules/queryset.ts`:
- Around line 75-83: Update RE_FOR_LOOP_HEAD and the loop-head matching flow so
chained QuerySet calls such as qs.filter(...).order_by(...) reach
mayIterateQuerySet and are recognized as iterable sources, while preserving
existing initial-call and .all() behavior. Add a regression case covering a
chained filter(...).order_by(...) QuerySet in a for loop and confirming DOL007
is reported.
- Around line 38-53: Add select_related and prefetch_related to the
QS_SOURCE_METHODS set so mayIterateQuerySet recognizes variable-rooted calls as
QuerySet sources, and add regression cases covering loops using both methods to
preserve DOL007 detection.
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CHANGELOG.mddocs/rules/DOL007.mdsrc/rules/queryset.tstest/rules/queryset.test.js
…p source
The loop-source gate listed fourteen method names, so a chain rooted on a
variable and ending in `select_related`, `prefetch_related`, `union`,
`intersection`, `difference`, `alias`, `dates`, `datetimes`, `extra`,
`select_for_update` or `raw` was read as a non-queryset source and the loop
was skipped entirely. A chain rooted on a manager was unaffected, because
`<Model>.objects.<method>` is matched by its own branch — so
`for post in User.objects.select_related("author"):` was still reported
while `for post in qs.select_related("author"):` was not.
Add the missing names. The new test pins the whole set rather than the two
cases that surfaced it, so the list cannot silently shrink again, and the
rule doc's enumeration is updated to match the set it describes.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
… to a review The comment explained the test by pointing at the review round that prompted it, which tells a later reader nothing about the rule. State the invariant the test pins instead. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Thanks — the first one was real and is fixed in
One consequence worth flagging: Chained calls ( |
1 participant
Summary
DOL007 fired on
for model in auditory_models():because it keyed on the attribute name rather than on what the loop iterates. It now gates on the loop source, so a loop whose iterable looks like a call is out of scope.Type of change
Test plan
node --test test/rules/queryset.test.js— 19/19 green, andnpx tsc -p ./clean.The regression tests assert both directions, because the first attempt at this fix silenced real findings. Against the pre-fix rule these fail on assertions:
for model in auditory_models(): model.objects.filter(...),model.Meta, andexcept model.DoesNotExist:— all previously reported, now silent.for order in Order.objects.all(): print(order.CUSTOMER.name)— an ALL-CAPS ForeignKey attribute, andp.X. Both must still report; an earlier name-based attempt had silenced them.Deleting the source gate turns the first group red while the second stays green, so the two halves are pinned independently.
Worth stating plainly, since it is a real cost:
for obj in self.get_queryset():andfor p in recent():no longer report. A line-oriented rule cannot tell what a helper returns, so any call-shaped source is skipped. Loops over a plain list still report —k_entries = ["a","b"]; for e in k_entries: print(e.upper)produces a finding — because the predicate looks at the source's shape, not its runtime type.Checklist
tsc, not the full Python + TypeScript suites; CI ran green on a fork (13 jobs)## [Unreleased]Related issues / discussions
Closes #72
The docs and the
## [Unreleased]entry describe the predicate in its own terms. I first wrote them as a comparison against thenplusoneanalyzer's scope and had to remove that: the two disagree in more directions than a sentence carries, so anything I said about the comparison kept being false in some case.docs/rules/DOL007.mdand the changelog now state only what this rule does, which is checkable frommayIterateQuerySetalone.Generated by Kimi K3 (implementation, testing), Claude Opus 5 (implementation, review, testing)
Summary by CodeRabbit
Bug Fixes
Documentation