completed coding challenge

[hollowred]

Summary

This PR adds interactive year filtering to the restaurant permit map, allowing users to visualize permit distribution across Chicago community areas from 2016-2026.

Changes Implemented

• Backend: Modified CommunityAreaSerializer to accept year parameter and count permits
• API Endpoint: /map-data/?year=YYYY now returns permit counts per community area
• Frontend: Added year selector dropdown to React map component
• Visualization: Dynamic coloring of community areas based on permit density
• Interactivity: Hover popups display detailed permit statistics
• Statistics: Display total permits and maximum permits per year
• Testing: Added unit tests for year filtering functionality

Technical Details

• Created get_num_permits() method in serializer with year from context
• Implemented fetch API call on year change in React component
• Added color gradient mapping based on percentage of max permits
• Popups show area name, permit count, and percentage of maximum

Testing

• Unit tests pass for year filtering
• Map displays correctly for all years 2016-2026
• Hover popups show correct data
• Colors update dynamically when year changes