| class BaseDatabaseValidation: | |
| """Encapsulate backend-specific validation.""" | |
| def __init__(self, connection): | |
| self.connection = connection | |
| def check(self, **kwargs): | |
| return [] | |
| def check_field(self, field, **kwargs): | |
| errors = [] | |
| # Backends may implement a check_field_type() method. | |
| if ( | |
| hasattr(self, "check_field_type") | |
| and | |
| # Ignore any related fields. | |
| not getattr(field, "remote_field", None) | |
| ): | |
| # Ignore fields with unsupported features. | |
| db_supports_all_required_features = all( | |
| getattr(self.connection.features, feature, False) | |
| for feature in field.model._meta.required_db_features | |
| ) | |
| if db_supports_all_required_features: | |
| field_type = field.db_type(self.connection) | |
| # Ignore non-concrete fields. | |
| if field_type is not None: | |
| errors.extend(self.check_field_type(field, field_type)) | |
| return errors | |