saygoweb / anorm / 18459577217

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Implement Join Model with Dynamic Foreign Key Constraint Management (#39)

* Implement Join Model feature with relationship support

- Add core relationship infrastructure (OneHasMany, ManyHasOne, ManyHasMany)
- Add RelationshipManager for handling relationship definitions and loading
- Extend Model class with relationship methods (hasMany, belongsTo, hasManyThrough)
- Extend QueryBuilder with eager loading support (with() method)
- Add comprehensive test suite with 9 test cases covering all relationship types
- Support explicit property names and direct property assignment (no magic methods)
- Maintain backward compatibility with existing Model functionality

Features implemented:
- One-to-many relationships (hasMany)
- Many-to-one relationships (belongsTo)
- Many-to-many relationships (hasManyThrough)
- Explicit relationship loading (loadRelated, loadAllRelated)
- Eager loading with QueryBuilder (with() method)
- Relationship-based JOINs (joinRelationship method)

All tests passing.

* Update Join Model implementation plan with completion status

- Mark all core phases as completed
- Add comprehensive implementation summary
- Document all successfully implemented features
- Update timeline to reflect actual vs planned completion
- Mark all success criteria as met
- Add technical implementation details and usage examples

* Implement dynamic foreign key constraint management

- Add foreign key constraint creation based on relationship definitions
- Extend TableMaker to handle foreign key constraint violations
- Add schema generation capabilities to relationship classes
- Add foreign key configuration options to Model class
- Create comprehensive tests for dynamic foreign key creation
- Support for belongsTo, hasMany, and hasManyThrough relationships
- Automatic creation of join tables for many-to-many relationships
- Constraint options: CASCADE, RESTRICT, SET NULL for delete/update
- All tests passing (13 new tests + 9 existing relationship tests)

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