improved doc
improved doc
added Model.{check, _check_fields} methods
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors
refactoring get_validation_errors