Average rating rounded

[meyyy03]

fix #554

Description
This PR fixes an issue where the course average rating was displayed with too many decimal places (e.g., 4.333333333333333). The average rating is now properly rounded to two decimal places.

Changes Made
Updated the average_rating property to round the result to 2 decimal points.

Before & After
Before: 4.333333333333333
After: 4.33

How to test
Open any course with reviews.
Confirm that the average rating is now shown with only two digits after the decimal.

Summary by CodeRabbit

• Refactor
  • Improved the calculation of course average ratings for greater accuracy and consistency by leveraging database aggregation and rounding.

[coderabbitai]

"""

Walkthrough

The change updates the average_rating property of the Course model in web/models.py. The previous implementation manually calculated the average rating from related Review objects. The new implementation uses Django's ORM aggregation function Avg to compute the average rating directly in the database, rounds the result to two decimal places, and defaults to 0 if there are no reviews. This refactor simplifies the code and ensures the returned average is rounded as required.

Changes

File(s)	Change Summary
web/models.py	Refactored Course.average_rating property to use Django ORM's Avg aggregation and rounding.

Assessment against linked issues

Objective	Addressed	Explanation
Round average rating to two decimal places in course card display (#554)	✅
"""

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Reviewing files that changed from the base of the PR and between 268f0a2 and a91946f.

📒 Files selected for processing (1)

• web/models.py (2 hunks)

🔇 Additional comments (1)

web/models.py (1)

10-10: Good addition of ORM aggregation import
Importing Avg from django.db.models is necessary for the new aggregation logic.

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• 📝 Generate Docstrings

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[A1L13N]

please run the pre-commit / lint

[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 63b638d and 55039cc.

📒 Files selected for processing (1)

• web/models.py (2 hunks)

🔇 Additional comments (1)

web/models.py (1)

9-9: Add import for database-level aggregation
The Avg import is correctly added to support the new average_rating implementation using Django’s ORM aggregation function.

[coderabbitai]

Actionable comments posted: 1

♻️ Duplicate comments (1)

web/models.py (1)

325-326: Efficient calculation with ORM aggregation and rounding.

The updated average_rating property uses Django's aggregate to compute the average rating, defaults to 0 when there are no reviews, casts to float, and rounds to two decimal places, improving readability and performance.

📜 Review details

Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 55039cc and 1be4225.

📒 Files selected for processing (1)

• web/models.py (2 hunks)

🔇 Additional comments (1)

web/models.py (1)

9-9: Import Avg from django.db.models.

This import is correctly placed and required for the new aggregation in average_rating.