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…ative index The original code used the positional week index (1-4) to determine which alternating week a collection falls on. Since week1 is always the *next occurrence* of the collection day (calculated relative to today), the same calendar date could be assigned different parities on consecutive days — causing the reported bin type to flip and the days-until-collection to jump by +5 or +6 overnight. Fix: derive parity from the ISO calendar week number of each collection date, which is an absolute property of the date and stays stable regardless of which day the scraper runs.
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📝 WalkthroughWalkthroughBolsover Council now calculates collection parity from a fixed epoch and each collection week’s Monday. The collection method passes collection dates to the helper. Tests cover alternating bins, calendar boundaries, date stability, and green-bin suspension. ChangesBolsover parity correction
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to The bin parity fix itself behaves correctly when the scraper runs, but the new tests added with it cannot execute because of a date type mismatch in the helper. Normalize the input date before merging so the regression coverage actually runs. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@uk_bin_collection/uk_bin_collection/councils/BolsoverCouncil.py`:
- Line 151: Replace the ISO-week modulo calculation in the collection parity
logic with a continuous fortnight index anchored to a date whose phase matches
the council’s WeekBlack and WeekBandG values, ensuring consecutive weeks always
alternate across year boundaries. Add a regression test covering the ISO week 53
to week 1 transition, including the dates 28 December 2026 and 4 January 2027.
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Use (iso_year * 53 + iso_week) % 2 instead of iso_week % 2. Without this, Dec 31 2026 (W53, odd) and Jan 7 2027 (W1, odd) would both get the same parity, breaking the alternating bin type at the year boundary. Addressed CodeRabbit review comment.
Replace iso_year*53+iso_week modulo with a continuous week count from a fixed epoch (2024-01-01, Monday of ISO week 1). The *53 approach still broke at 52-week year boundaries (e.g. 2027→2028) because not all years have 53 ISO weeks. Extracted _determine_bin_collection to module level for testability. Added 8 regression tests covering: - Consecutive Thursday alternation - Known Sept 2026 collection dates (verified against HA sensors) - ISO week 53 → week 1 transition (2026→2027) - ISO week 52 → week 1 transition (2027→2028) - Parity stability across weekdays - Green bin suspension handling Addressed CodeRabbit review comments.
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Inline comments:
In `@uk_bin_collection/uk_bin_collection/councils/BolsoverCouncil.py`:
- Line 153: Update the parity calculation near the existing iso_year/iso_week
expression to use a continuous, phase-aligned fortnight index anchored to a
known WeekBlack or WeekBandG collection date, so consecutive collection weeks
across 52-week ISO year boundaries alternate correctly. Add a regression test
covering the transition from ISO week 52 of a 52-week year to ISO week 1 of the
following year.
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Addressed both review comments in What changedParity calculation — replaced _PARITY_EPOCH = date(2024, 1, 1) # Monday of ISO week 1
monday = collection_date - timedelta(days=collection_date.weekday())
weeks = (monday - _PARITY_EPOCH).days // 7
parity = "1" if weeks % 2 == 0 else "2"The Extracted Regression tests (8 passing)
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The previous epoch (2024-01-01, ISO week 1) produced inverted parity: Sept 22 was reported as Burgundy+Green when the council calendar B shows it as Black Bin. Verified against live council website. Changed epoch from 2024-01-01 to 2024-01-08 (ISO week 2 Monday), which aligns with the council's actual Week 1 phase. Also added Round A regression test (UPRN 100030066550, WeekBlack=1, WeekBandG=2) confirming Round A and Round B always get opposite bin types on the same date. Ground truth verified: - Sept 22, 2026 = Black Bin (Round B, council website) - Sept 29, 2026 = Burgundy+Green (Round B, council website) - Round A (WeekBlack=1): Sept 22 = Burg+Green, Sept 29 = Black - Year boundaries (53→1, 52→1) all alternate correctly
Fixed: epoch was off by one weekThe previous epoch ( Evidence:
Also verified:
The likely cause: Bolsover council skips a collection week over Christmas, shifting the parity phase by one week each year. The epoch had to be offset to match. |
monday is a datetime (from datetime.today() + timedelta) but _PARITY_EPOCH is a date. Convert monday to date before subtraction.
CodeRabbit review: tests pass datetime.date objects which lack .date(), while production passes datetime.datetime. Normalize to date at the top of _determine_bin_collection so both paths work.
Update: fix verified and deployedThe fix is now live and working correctly on a real Bolsover address (Pinxton area, Round B, UPRN 100030066827). Before fix:
After fix:
Commits on this PR:
The key discovery: the council's Week 1 phase does NOT align with ISO week 1. Likely due to a Christmas skip week that shifts the parity each year. Epoch 2024-01-08 (ISO week 2) matches the council's actual schedule. |
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Inline comments:
In `@uk_bin_collection/uk_bin_collection/councils/BolsoverCouncil.py`:
- Line 34: Normalize collection_date to a date in the parity calculation used by
the relevant function, converting datetime inputs with their date component
while leaving date inputs unchanged. Then calculate weeks using monday directly,
removing the invalid monday.date() call; preserve the existing parity behavior
for both supported input types.
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Fixed in |
… relative week number The scraper computed which bin type (Black, or Burgundy+Green) is collected on a date using a week index (1-4) positioned relative to "today". The same calendar date could get different parities on consecutive runs, and the phase didn't reliably survive ISO week-53 year boundaries. Anchor to a fixed epoch (2024-01-08, the Monday found by testing against the council's published calendar to match their "Week 1" phase) and derive parity from a continuous fortnight count from there, so consecutive weeks always alternate regardless of when the scraper runs or where a year boundary falls. Verified against Bolsover's published calendar B (UPRN 100030066827): confirmed Black Bin on 22/09/2026, Burgundy+Green on 29/09/2026. Credit: JoeGandy (#2236).
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Thanks for the deep dive on this — the epoch-anchored continuous fortnight index and the ISO week-53 boundary test coverage are exactly right. Folded into the next release PR in #2241 with credit. Closing this one out. Generated by Claude Code |
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Bug: BolsoverCouncil reports wrong bin type — parity epoch was inverted
The Problem
The scraper assigns bin types by computing a parity value ("1" or "2") for each collection date and matching it against the council's
WeekBlack/WeekBandGvalues. The original code used a positional week index (1–4) that was relative to "today", causing the same calendar date to get different parities on consecutive scraper runs.Verified Ground Truth
Confirmed against the Bolsover council published calendar B (https://www.bolsover.gov.uk/services/b/bins-and-recycling/bin-calendar-b):
Round A and Round B are always opposite — confirmed by querying the Bolsover API for both UPRN 100030066827 (Round B) and UPRN 100030066550 (Round A).
The Fix
Use a continuous fortnight index anchored to a fixed epoch (
2024-01-08, Monday of ISO week 2). This aligns with the council's actual "Week 1" phase:Consecutive weeks always alternate — even across ISO week-53 year boundaries (2026→2027) and 52-week years (2027→2028).
Why
2024-01-08and not2024-01-01?The council's "Week 1" (where WeekBandG collection falls) does NOT align with ISO week 1. The Bolsover council likely has a skip week over Christmas that shifts the phase each year.
2024-01-08(ISO week 2) was determined by testing against the published calendar:2024-01-01→ Sept 22 = parity 1 → Burgundy+Green (WRONG — council says Black)2024-01-08→ Sept 22 = parity 2 → Black (CORRECT)Regression Tests (10 passing)
test_consecutive_thursdays_alternatetest_known_september_2026_collections_round_btest_round_a_opposite_to_round_btest_week53_to_week1_transition_2026_2027test_week53_thursday_dec31_2026test_week52_to_week1_transition_2027_2028test_parity_stable_across_weekdaystest_green_suspension_returns_burgundy_onlytest_no_suspension_returns_bothAdditional Notes
get_route_number()maps Route codes to weekdays ("ThS" → Thursday). The actual collection day for Pinxton addresses appears to be Tuesday based on sensor data. This is a separate issue from the parity fix — the parity/brightness logic works regardless of which day collections actually fall on.Route,WeekBlack,WeekBandG— no actual collection dates. The scraper computes dates from the Route code.Summary by CodeRabbit