Enhance PySpringModel: Add Self Type Hint, Improve Error Handling, and Add Tests

[NFUChen]

Summary

This pull request introduces several enhancements to the PySpringModel class, including improved type hinting, better error handling, and comprehensive test coverage.

Changes

1. Type Hinting:

   • Updated the clone method in PySpringModel to use the Self type hint, ensuring that subclasses can return themselves as the return type of the method.

2. Error Handling:

   • Enhanced the get_primary_key_columns method to raise a clear ValueError if the specified table is not found in the metadata.

3. Testing:

   • Added a new test file, tests/test_py_spring_model.py, to cover the following functionalities:
     • Setting and getting the engine, metadata, and connection.
     • Creating and managing sessions using create_session and create_managed_session.
     • Retrieving primary key columns.
     • Cloning models using the updated clone method.
     • Ensuring functionality remains intact after exceptions in managed sessions.

Rationale

These changes improve the robustness of the PySpringModel class by leveraging modern Python type hinting features and introducing stricter error handling. Comprehensive tests ensure the stability and reliability of the class for future development.

Testing

• All tests have been added to tests/test_py_spring_model.py.
• Verified that all tests pass in the local environment.

Impact

• Enhances developer experience by providing precise type hints.
• Increases confidence in the PySpringModel implementation through comprehensive testing.
• Improves clarity and error messaging for easier debugging.