- Add generate_aux_model_class method to dynamically create ActiveRecord models
- Generated models extend ActiveRecord::Base with proper table name configuration
- Add belongs_to association back to STI parent class with correct foreign key
- Add model_class attribute to Configuration class for storing generated model reference
- Integrate model generation into aux_table DSL method
- Add fallback simple class for test environments without full ActiveRecord
- Add comprehensive test suite covering model generation functionality
- Support proper constant creation and conflict detection
- All 33 tests passing with appropriate skipping for test environment
This completes Task 3: auxiliary model classes are now dynamically generated
when aux_table is called, providing the foundation for ActiveRecord associations.
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