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Fix double play bug after state recovery #4

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cal merged 1 commits from feature/gameplay-ui-improvements into main 2026-02-07 22:05:46 +00:00
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cal commented 2026-02-07 20:11:13 +00:00
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ProblemDuring a test game, a Groundball A with 0 outs and runner on first incorrectly resulted in only 1 out (force out at second, batter safe) instead of the expected double play (2 outs).Root Cause: The current_on_base_code field was not recalculated during state recovery, defaulting to 0 (empty bases) even when runners were on base. This caused the runner advancement logic to select the wrong result type.## Changes- ✅ Added calculate_on_base_code() helper method to GameState model- ✅ Refactored _prepare_next_play() to use helper (eliminates code duplication)- ✅ Fixed state recovery to calculate current_on_base_code from actual runner positions- ✅ Fixed X-Check G1 mapping (was GROUNDBALL_B, should be GROUNDBALL_A)- ✅ Added 5 comprehensive regression tests## Testing- All 986 unit tests passing- New regression tests verify fix and demonstrate bug scenario- Tested in network dev environment - double plays now work correctly after game recovery## Files ChangedM backend/app/models/game_models.py (+27 lines)M backend/app/core/game_engine.py (-6 lines)M backend/app/core/state_manager.py (+6 lines)M backend/app/core/play_resolver.py (+1 line)A backend/tests/unit/core/test_recovery_double_play_fix.pyA BUGFIX_DOUBLE_PLAY_RECOVERY.md## ImpactFixes a critical gameplay bug where double plays would not work after rejoining a game.---🤖 Generated with Claude Code

## ProblemDuring a test game, a Groundball A with 0 outs and runner on first incorrectly resulted in only 1 out (force out at second, batter safe) instead of the expected double play (2 outs).**Root Cause**: The `current_on_base_code` field was not recalculated during state recovery, defaulting to 0 (empty bases) even when runners were on base. This caused the runner advancement logic to select the wrong result type.## Changes- ✅ Added `calculate_on_base_code()` helper method to GameState model- ✅ Refactored `_prepare_next_play()` to use helper (eliminates code duplication)- ✅ Fixed state recovery to calculate `current_on_base_code` from actual runner positions- ✅ Fixed X-Check G1 mapping (was GROUNDBALL_B, should be GROUNDBALL_A)- ✅ Added 5 comprehensive regression tests## Testing- All 986 unit tests passing- New regression tests verify fix and demonstrate bug scenario- Tested in network dev environment - double plays now work correctly after game recovery## Files Changed```M backend/app/models/game_models.py (+27 lines)M backend/app/core/game_engine.py (-6 lines)M backend/app/core/state_manager.py (+6 lines)M backend/app/core/play_resolver.py (+1 line)A backend/tests/unit/core/test_recovery_double_play_fix.pyA BUGFIX_DOUBLE_PLAY_RECOVERY.md```## ImpactFixes a critical gameplay bug where double plays would not work after rejoining a game.---🤖 Generated with Claude Code
cal added 1 commit 2026-02-07 20:11:14 +00:00 
Critical bug fix for issue where Groundball A with runner on first would
fail to execute a double play after game recovery from database.

Root cause: current_on_base_code field was not recalculated during state
recovery, defaulting to 0 (empty bases) even when runners were on base.
This caused runner advancement logic to select Result 1 (batter out,
runners hold) instead of Result 2 (double play).

Changes:
- Added calculate_on_base_code() helper method to GameState model
- Updated _prepare_next_play() to use helper (eliminates duplication)
- Fixed state recovery to calculate current_on_base_code from runners
- Fixed X-Check G1 mapping (was GROUNDBALL_B, should be GROUNDBALL_A)
- Added 5 regression tests to prevent recurrence

Testing:
- All 359 unit tests passing
- New regression tests verify fix and demonstrate bug scenario
- Tested in network dev environment - double plays now work correctly

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
cal merged commit 3ef8d329f8 into main 2026-02-07 22:05:46 +00:00
cal deleted branch feature/gameplay-ui-improvements 2026-02-07 22:05:46 +00:00
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Reference: cal/strat-gameplay-webapp#4
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