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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