Implement Aggregate Rating Calculation for Product Reviews

[HermanKoii]

Implement Aggregate Rating Calculation for Product Reviews

Description

Task

Create a method to calculate and return average product rating

Acceptance Criteria

• Method must accept a valid product ID
• Return accurate average rating
• Handle products with no reviews
• Round rating to 2 decimal places
• Provide total review count

Summary of Work

Overview

This pull request implements an aggregate rating calculation method for product reviews, providing a robust solution for computing average ratings and total review counts.

Changes Made

• Added calculateAggregateRating method to productReview.ts
• Implemented MongoDB aggregation pipeline for efficient rating calculation
• Included comprehensive error handling and input validation
• Supports scenarios with and without existing reviews

Implementation Details

• Method accepts a productId as input
• Uses MongoDB's aggregation framework for performant rating calculation
• Returns an object with:
  • averageRating: Rounded to 2 decimal places
  • totalReviews: Total number of reviews for the product
• Handles edge cases like products with no reviews

Acceptance Criteria

✅ Correctly calculates average rating for a product
✅ Returns 0 rating when no reviews exist
✅ Rounds average rating to 2 decimal places
✅ Provides total review count
✅ Validates input product ID

Testing Approach

• Input validation tested for missing/invalid product ID
• Aggregation logic covers scenarios with multiple reviews
• Handles products with no reviews gracefully

Performance Considerations

• Uses MongoDB aggregation for efficient computation
• Minimal memory overhead
• O(n) time complexity for rating calculation

Changes Made

• Added calculateAggregateRating method in productReview.ts
• Implemented MongoDB aggregation pipeline
• Added input validation
• Rounded average rating to 2 decimal places

Tests

• Verify average rating calculation
• Check handling of products with no reviews
• Test input validation
• Confirm rounding to 2 decimal places
• Validate total reviews count

Signatures

Staking Key

G79TK8ccVx11JCsStBY85thohoSCm5eDwACAVju4z7bj: ZBwtSYcuMbpbBBXzUanUo5dXpEU6rnFYpgnLFEwZXGDrS8rTSxaGKy5TqYnoq6tQ3ygcWmCN4ZqQn2d7f4NVKq4HtHFiqCeEtYZZERfNst1U11M9DK2m7SSaYcZ8MvRyMWToRWhDGxRVywaJL6kBBzi3bKRnBSAyBXErZxTtfCgHdQSE5KUXppLtaums7wbGHevdS2cf9sCUA2LyUcrEvoCoaMDsKjNwTpAL4jdBnCJ2or2fTfnKkWDzQAwEypLbrrUXVrL7BxjWmSPGgwEvCakboujN5zQD4RXjSM2YVr9niAzfUWiHrzo5FLZTZ6YsvPggWbDTUxMUcaVSZCYwmj5y2RTJVfyKfxBNnQVxLWDubzXhTRz5r6EsZSKutYZxv2mFTa4L8NrhYbCJxsPfjKcqsdoqTJvMAC

Public Key

3Zfb8hhM5g8ZC7nqNKELNBByLSP56s6gqGNc8RWB6PgP: Bm1fWchATqVMnqEcpp8s9nurKNEq9vLVx42eh26u5PBx9oLUnTiP4EAg75FrPPW9t1yMDNPGQ4VSd62odPi7jn4doF1NjTRaTfrjkPDGuUra2HpYFN6sY2q9tbQ8ZfEPGQabJYcTRwFuyTLvbJbsd23shFgMQw9Tne9UvLP5iAB2u7DxN8UTZmrrmGMFz8pyoeaRW7RZyw2XshzkYnxpsL5PpGzMXCnRiHjSe5adfTM2ZqWa5DBUd3LxViPH9H8f9FUQkvp3p6q61sh5SLpEaUun1ofpaVKVPk8MQxm8QqZPR1HHCNEGxswgeTHo6goyPP2k5HLSyQkDoCafQCm4PoTYKpCDP449ayUmLMYjy2p4c9QxV83VQqgLyAcyDfGvxNtQbsct4kvCfoWrrwJBHKRSJpNd4WMpaQ