76 lines
4.9 KiB
Markdown
76 lines
4.9 KiB
Markdown
# Requirements Document
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## Introduction
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This feature addresses a MongoDB compatibility issue where the current implementation uses the `$unionWith` aggregation operator, which is only available in MongoDB 4.4+. The system needs to support MongoDB 3.x environments by replacing the `$unionWith` approach with a compatible solution that queries collections separately and performs deduplication in application code.
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## Glossary
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- **Inspection_Result_System**: The secondary circuit inspection result management system
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- **MongoDB_Driver**: The C# MongoDB driver used to interact with MongoDB
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- **Collection_Sharding**: The practice of splitting data across multiple collections based on time periods (year-month)
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- **Deduplication**: The process of removing duplicate inspection results based on day, inspection item ID, and status
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- **Aggregation_Pipeline**: MongoDB's framework for data aggregation operations
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## Requirements
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### Requirement 1: Replace $unionWith with Compatible Approach
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**User Story:** As a system administrator, I want the inspection result query to work on MongoDB 3.x, so that I don't need to upgrade the database server.
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#### Acceptance Criteria
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1. WHEN the system queries inspection results across multiple collections, THE Inspection_Result_System SHALL NOT use the $unionWith operator
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2. WHEN querying multiple collections, THE Inspection_Result_System SHALL query each collection separately using standard MongoDB operations
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3. WHEN multiple collection queries complete, THE Inspection_Result_System SHALL merge the results in application memory
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4. THE Inspection_Result_System SHALL maintain the same deduplication logic (by Year, Month, Day, SecondaryCircuitInspectionItemId, and Status)
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5. THE Inspection_Result_System SHALL maintain the same sorting and pagination behavior as the current implementation
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### Requirement 2: Preserve Query Performance
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**User Story:** As a system user, I want query performance to remain acceptable, so that the application remains responsive.
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#### Acceptance Criteria
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1. WHEN querying inspection results, THE Inspection_Result_System SHALL complete queries within 5 seconds for typical datasets (up to 12 months of data)
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2. WHEN performance degrades, THE Inspection_Result_System SHALL log performance warnings with timing details
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3. THE Inspection_Result_System SHALL use projection to limit fields retrieved from MongoDB
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4. THE Inspection_Result_System SHALL apply filters at the MongoDB level before retrieving data
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5. WHEN sorting results, THE Inspection_Result_System SHALL perform sorting in-memory after deduplication
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### Requirement 3: Maintain Functional Equivalence
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**User Story:** As a developer, I want the new implementation to produce identical results to the old implementation, so that existing functionality is not broken.
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#### Acceptance Criteria
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1. WHEN deduplicating results, THE Inspection_Result_System SHALL group by the same fields (Year, Month, Day, SecondaryCircuitInspectionItemId, Status)
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2. WHEN multiple records exist for the same group, THE Inspection_Result_System SHALL select the first record after sorting
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3. WHEN paginating results, THE Inspection_Result_System SHALL return the correct page of results based on skip and limit parameters
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4. THE Inspection_Result_System SHALL return both the paginated results and the total count
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5. WHEN handling null Status values, THE Inspection_Result_System SHALL treat them consistently with the original implementation
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### Requirement 4: Error Handling and Logging
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**User Story:** As a system administrator, I want clear error messages and logging, so that I can troubleshoot issues effectively.
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#### Acceptance Criteria
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1. WHEN a collection query fails, THE Inspection_Result_System SHALL log the error with collection name and continue with other collections
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2. WHEN all collection queries fail, THE Inspection_Result_System SHALL return an appropriate error message
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3. THE Inspection_Result_System SHALL log the number of collections queried and the number of results from each collection
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4. THE Inspection_Result_System SHALL log performance metrics including query time and deduplication time
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5. WHEN query time exceeds thresholds, THE Inspection_Result_System SHALL log performance warnings
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### Requirement 5: Backward Compatibility
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**User Story:** As a developer, I want the method signature to remain unchanged, so that calling code does not need to be modified.
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#### Acceptance Criteria
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1. THE Inspection_Result_System SHALL maintain the same method signature for QueryPagedDeduplicatedResultsAcrossCollectionsAsync
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2. THE Inspection_Result_System SHALL accept the same parameters (collectionNames, filter, sortField, isDescending, skipCount, pageSize, cancellationToken)
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3. THE Inspection_Result_System SHALL return the same result type (tuple of List<SecondaryCircuitInspectionResult> and long totalCount)
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4. THE Inspection_Result_System SHALL support cancellation via CancellationToken
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5. THE Inspection_Result_System SHALL handle empty collection lists by returning empty results
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