Bug: Prevent empty pagination requests in feed API

[nicktytarenko]

ResearchHub/issues#684

What?

The feed API endpoint (/api/feed/) was returning a next pagination link even when there were no more items to fetch. This caused the frontend to make unnecessary API requests to empty pages.

Example:

• Request: api/feed/?page=1&page_size=20&feed_view=popular&hub_slug=biology
• Response: Returns 5 items but includes next pointing to page=2
• Frontend makes another request to page=2 which returns empty results

Solution

Updated FeedPagination.get_paginated_response() to only include the next link when the number of results equals the requested page size. This ensures:

• If you get a full page (e.g., 20 items when requesting 20), include next (more pages may exist)
• If you get fewer items than requested (e.g., 5 items when requesting 20), omit next (no more pages)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.69%. Comparing base (cdf4b59) to head (72cf463).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3023   +/-   ##
=======================================
  Coverage   76.69%   76.69%           
=======================================
  Files         550      550           
  Lines       29508    29509    +1     
=======================================
+ Hits        22632    22633    +1     
  Misses       6876     6876           

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