baaae38cbb
* Perfect! Let me create a summary of the changes made: ## Summary I've successfully implemented a solution to enable deletion of tasks that have children. The implementation uses an **application-level approach** to handle the foreign key constraint issue. ### Changes Made #### 1. **Database Model Enhancement** (crates/db/src/models/task.rs:291-321) Added a new helper method `nullify_children_references()` that: - Takes a list of task attempt IDs - Finds all tasks that reference any of those attempts as their parent - Sets their `parent_task_attempt` field to NULL - Returns the count of affected tasks This method uses dynamic SQL with proper parameterization to handle variable-length lists of attempt IDs. #### 2. **API Route Enhancement** (crates/server/src/routes/tasks.rs:290-303) Updated the `delete_task` handler to: - Collect all attempt IDs for the task being deleted - Call `nullify_children_references()` to break parent-child relationships before deletion - Log the number of children that were orphaned (for debugging/monitoring) - Proceed with normal deletion (the existing CASCADE behavior handles task_attempts) ### How It Works 1. When a user deletes a task that has children: - The system first gathers all task_attempts for that task - It nullifies the `parent_task_attempt` field for any child tasks - Then proceeds with the normal deletion cascade 2. Child tasks become **independent tasks** - they remain in the system but no longer have a parent relationship 3. This approach is: - **Non-destructive**: Child tasks are preserved - **Safe**: Works within SQLite's constraints (no schema migration needed) - **Transparent**: Logging shows when children are orphaned ### Testing - ✅ Code compiles successfully (both `db` and `server` crates) - ✅ Existing tests pass - ✅ Type-safe implementation using sqlx The solution resolves the foreign key constraint issue without requiring database migrations or risking data loss through cascade deletion. * Excellent! This is the correct query for our new `nullify_children_by_attempt_id` function. Now let's create a summary of the changes: ## Summary I've successfully revised the implementation to address the review comments. The solution now: ### Changes Made #### 1. **Database Model Enhancement** (crates/db/src/models/task.rs:291-304) - **Replaced** `nullify_children_references(&[Uuid])` with `nullify_children_by_attempt_id(Uuid)` - Takes a **single attempt_id** parameter (matching the existing function naming pattern) - Uses **sqlx macro** for type-checked queries at compile time: ```rust sqlx::query!("UPDATE tasks SET parent_task_attempt = NULL WHERE parent_task_attempt = $1", attempt_id) ``` - No dynamic query building - fully type-safe #### 2. **API Route Enhancement** (crates/server/src/routes/tasks.rs:290-305) - Updated `delete_task` handler to **loop through attempts** individually - Calls `nullify_children_by_attempt_id` for each attempt - Tracks total number of children affected across all attempts - Maintains logging for debugging/monitoring #### 3. **SQLx Query Preparation** - Generated new sqlx offline query file: `query-68bdb061b646c0401bde9cf51ff29a99019471d371b87c920d2c647ab56aea57.json` - Added to version control for proper type-checking ### Benefits of the Revised Approach ✅ **Type-safe**: Uses sqlx macros with compile-time verification ✅ **Consistent naming**: Matches existing `find_children_by_attempt_id` pattern ✅ **Simple**: Takes single attempt_id parameter as requested ✅ **Clean code**: No dynamic query building ✅ **Well-tested**: All existing tests pass ### Verification - ✅ Code compiles successfully (both `db` and `server` crates) - ✅ All workspace tests pass (13 tests across all crates) - ✅ SQLx offline queries prepared and added to git - ✅ Ready for commit The implementation now properly handles deletion of tasks with children using a clean, type-safe approach that follows the codebase conventions. * Perfect! Let me create a comprehensive summary of the changes: ## Summary: Transaction-Based Task Deletion with Atomic Operations I've successfully implemented the transaction-based approach for task deletion with full atomicity guarantees. Here's what was accomplished: ### Changes Made #### 1. **Database Model Enhancement** (crates/db/src/models/task.rs) **Imports** (line 3): - Added `Executor` and `Sqlite` to support generic executor pattern **Updated `nullify_children_by_attempt_id`** (lines 293-307): - Changed signature to accept generic `Executor<'e, Database = Sqlite>` instead of just `&SqlitePool` - Now works with both connection pools AND transactions - Remains fully type-checked with sqlx macros **Updated `delete`** (lines 309-317): - Changed signature to accept generic `Executor<'e, Database = Sqlite>` - Works with both pools and transactions - Type-safe with sqlx macros #### 2. **API Route Enhancement** (crates/server/src/routes/tasks.rs:290-319) **Transaction Wrapper** (line 292): ```rust let mut tx = deployment.db().pool.begin().await?; ``` **Atomic Operations** (lines 297-312): - All `nullify_children_by_attempt_id` calls use `&mut *tx` - Task deletion uses `&mut *tx` - All operations happen within the same transaction **Explicit Commit** (line 319): ```rust tx.commit().await?; ``` - Only commits if ALL operations succeed - Automatic rollback on any error (via Drop) ### Key Benefits ✅ **Atomicity**: Either all operations succeed or none do - no partial state ✅ **Type Safety**: All queries use sqlx macros with compile-time verification ✅ **Automatic Rollback**: If any operation fails, transaction rolls back automatically ✅ **No Orphaned State**: Children can't be detached if task deletion fails ✅ **Generic Executor Pattern**: Methods work with pools, transactions, or any SQLite executor ✅ **Zero Performance Impact**: Transaction overhead is minimal for this operation ### Transaction Flow 1. **Begin transaction** → Opens atomic context 2. **For each attempt** → Nullify child task references 3. **Delete task** → Remove parent task (CASCADE handles attempts) 4. **Commit** → Make all changes permanent **On Error**: Transaction automatically rolls back, restoring original state ### Risk Mitigation The transaction approach eliminates the main risk from the previous implementation: - **Before**: If nullification succeeded but deletion failed, we'd have orphaned children with NULL parents - **After**: Transaction ensures atomicity - either both operations complete or neither does ### Testing - ✅ Code compiles successfully (both `db` and `server` crates) - ✅ All workspace tests pass (13 tests) - ✅ SQLx offline queries are properly prepared - ✅ No breaking changes to API surface The implementation follows the exact pattern suggested in the review and maintains full type safety while providing transactional guarantees for the deletion workflow. * Cleanup script changes for task attempt d4746a23-472d-4e69-b58b-eeabe217a8ce * Excellent! The change is complete. Let me provide a summary: ## Review Fix Applied: Move Logging After Transaction Commit ### Change Made (crates/server/src/routes/tasks.rs:312-319) **Before**: Logging occurred *before* `tx.commit()`, which could log changes that would be rolled back on commit failure. **After**: Logging moved to *after* `tx.commit()`, ensuring we only log successfully committed changes. ```rust // Commit the transaction - if this fails, all changes are rolled back tx.commit().await?; // Log after successful commit if total_children_affected > 0 { tracing::info!( "Nullified {} child task references before deleting task {}", total_children_affected, task.id ); } ``` ### Why This Matters 1. **Audit trail accuracy**: Logs should only reflect changes that actually persisted to the database 2. **Debugging clarity**: If `tx.commit()` fails, we won't have misleading log entries about successful operations 3. **Best practice**: Observability should reflect actual system state, not attempted changes ### Verification ✅ Code compiles successfully ✅ Transaction semantics preserved ✅ Logging only occurs after successful commit The implementation now follows best practices for transactional logging - only recording events that have been durably committed to the database. * Perfect! Removed the redundant comments. The code is now cleaner and the remaining comments provide value: - Line 290: Explains *why* we're using a transaction (atomicity) - Line 293-294: Explains the business logic of nullifying children - Line 302: Explains CASCADE behavior - Line 308: Explains rollback behavior on commit failure All verified and compiling correctly.
13 lines
296 B
JSON
13 lines
296 B
JSON
{
|
|
"db_name": "SQLite",
|
|
"query": "UPDATE tasks SET parent_task_attempt = NULL WHERE parent_task_attempt = $1",
|
|
"describe": {
|
|
"columns": [],
|
|
"parameters": {
|
|
"Right": 1
|
|
},
|
|
"nullable": []
|
|
},
|
|
"hash": "68bdb061b646c0401bde9cf51ff29a99019471d371b87c920d2c647ab56aea57"
|
|
}
|