Rating System

Overview

Users can rate any lineup (except their own) on a scale from 0.01 to 10. Ratings are aggregated into an average displayed on the lineup card.

How It Works

• Upsert model — rating again overwrites your previous rating
• Atomic updates — ratingSum, ratingCount, and avgRating are updated in a single aggregation pipeline to prevent race conditions
• Color scale — the rating slider transitions from red → green → diamond based on value

Schema

Rating {
  value: Number (0.01–10)
  user: ObjectId → User
  lineup: ObjectId → Lineup
}

Design Decisions

<!-- Why 0.01–10? Why upsert instead of allowing multiple ratings? Performance considerations? -->

Content coming soon — add your video and detailed writeup here.