Fix college sorting bug and add IG task summary API

[NayanUnni95]

Task1 #2651 — Fix Sorting Bug + Add Multi-Field Sorting

Fix Implemented

Updated the sort_fields dictionary in CollegeApi.get() to correctly map query params to ORM fields

sort_fields = {
    "org": "org__title",
    "level": "level",
    "created_at": "created_at"
}

Verification

Tested using Postman:

• sortBy=level → ascending
• sortBy=-level →descending
• sortBy=created_at → oldest first
• sortBy=-created_at → newest first

Also verified:

• Pagination (pageIndex, perPage) works correctly
• Search (?search=) is unaffected
• Unsupported sortBy values fall back gracefully

Edge Cases Considered

• Invalid sortBy → no crash, default behavior preserved
• Null or missing related org → handled safely by ORM

Postman screenshots

Task2 #2658 — IG Task Summary API

Endpoint Added

GET /api/v1/dashboard/ig/<ig_id>/task-summary/

Implementation Approach

• Added IGTaskSummaryAPI in dash_ig_view.py
• Used ORM aggregation (Count, Sum) on KarmaActivityLog
• Applied optional date filtering (from_date, to_date)
• No N+1 queries (fully DB-level aggregation)

Features Implemented

• Returns:
  • Total tasks completed
  • Total karma awarded
  • Unique contributors
  • Top 5 contributors
• Supports optional date range filtering
• Returns zero values if no activity exists
• Proper error handling for:
  • Invalid ig_id
  • Invalid date format

Tested via Postman:

Assumptions:

• KarmaActivityLog represents completed task activity
• karma field is used for aggregation
• created_at is used for date filtering

Checklist

• Fixed sortBy=org bug
• Added multi-field sorting support
• Implemented IG Task Summary API
• Date filtering works correctly
• Returns zeros when no activity exists
• Proper error handling implemented
• No N+1 queries (DB-level aggregation used)
• Follows project coding conventions