Refactor taxa list endpoints to follow the project-user membership API

[mihow]

Summary

Refactors taxa list endpoints to use a through model (TaxaListTaxon) instead of custom POST actions, following the same pattern as the project membership API for consistency and better RESTful design.

Changes

Backend

• Created TaxaListTaxon through model (ami/main/models.py:3606)

  • ForeignKeys to TaxaList and Taxon
  • Unique constraint on (taxa_list, taxon)
  • Permission checks for authenticated users

• Database migration (ami/main/migrations/0081_add_taxalist_taxon_through_model.py)

  • Creates through model table
  • Migrates existing M2M data (16,838 memberships preserved)
  • Updated TaxaList.taxa to use through parameter

• Created serializers (ami/main/api/serializers.py:672)

  • TaxaListTaxonSerializer - Create/update with validation
  • TaxaListTaxonListSerializer - Simplified for list views
  • Validates taxon existence and uniqueness
  • Returns proper error messages for duplicates

• Created TaxaListTaxonViewSet (ami/main/api/views.py:1633)

  • Nested routing under taxa lists
  • Standard CRUD operations
  • Custom delete_by_taxon action for convenience

• Updated router (config/api_router.py:40)

  • Added nested router configuration
  • Routes: /taxa/lists/{taxalist_id}/taxa/

• Removed deprecated actions

  • add_taxon() action from TaxaListViewSet
  • remove_taxon() action from TaxaListViewSet

Frontend

• Updated useAddTaxaListTaxon hook

  • Changed from POST /taxa/lists/{id}/add_taxon/ to POST /taxa/lists/{id}/taxa/

• Updated useRemoveTaxaListTaxon hook

  • Changed from POST /taxa/lists/{id}/remove_taxon/ to DELETE /taxa/lists/{id}/taxa/by-taxon/{taxon_id}/

Tests

• Comprehensive test suite (ami/main/tests/test_taxa_list_taxa_api.py)
  • 16 test cases covering all CRUD operations
  • Permission checks
  • Error cases (duplicates, non-existent taxa)
  • Data migration verification
  • All tests passing ✅

API Changes

New Endpoints

• GET /taxa/lists/{id}/taxa/ - List taxa in a taxa list
• POST /taxa/lists/{id}/taxa/ - Add taxon (201 Created, 400 if duplicate)
• GET /taxa/lists/{id}/taxa/{membership_id}/ - Retrieve membership details
• DELETE /taxa/lists/{id}/taxa/{membership_id}/ - Remove by membership ID (204 No Content)
• DELETE /taxa/lists/{id}/taxa/by-taxon/{taxon_id}/ - Remove by taxon ID (204 No Content, 404 if not found)

Removed Endpoints

• POST /taxa/lists/{id}/add_taxon/ (deprecated)
• POST /taxa/lists/{id}/remove_taxon/ (deprecated)

Benefits

1. Proper HTTP semantics: POST creates (201), DELETE destroys (204), duplicates return 400
2. RESTful design: Nested resources follow standard conventions
3. Better error handling: Clear error messages for invalid operations
4. Consistency: Matches the project membership API pattern
5. Backward compatibility: M2M relationship still works through the through model
6. Data integrity: Migration preserved all existing relationships
7. Test coverage: Comprehensive test suite for all operations

Testing

# Run all tests
docker compose run --rm django python manage.py test ami.main.tests.test_taxa_list_taxa_api

# Verify data migration
docker compose exec django python manage.py shell -c "
from ami.main.models import TaxaList, TaxaListTaxon
for taxa_list in TaxaList.objects.all():
    assert taxa_list.taxa.count() == TaxaListTaxon.objects.filter(taxa_list=taxa_list).count()
print('✓ All data preserved')
"

Checklist

• Backend implementation complete
• Frontend hooks updated
• Migration preserves existing data
• Tests added and passing
• API documentation updated in PR description
• Follows project membership API pattern

🤖 Generated with Claude Code

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