def base_classes(self):
"""
Returns all base classes for history model.
"""
parents = (
self.find_closest_versioned_parent()
or self.manager.option(self.model, 'base_classes')
or (declarative_base(self.model), )
)
return parents + (VersionClassBase, )
def build_models(self):
"""
Build declarative history models based on classes that were collected
during class instrumentation process.
"""
if self.pending_classes:
cls = self.pending_classes[0]
self.declarative_base = declarative_base(cls)
self.transaction_log_cls = self.create_transaction_log()
self.transaction_changes_cls = self.create_transaction_changes()
self.transaction_meta_cls = self.create_transaction_meta()
for cls in self.pending_classes:
if not self.option(cls, 'versioning'):
continue
table = self.closest_matching_table(cls)
if table is not None:
builder = ModelBuilder(self, cls)
builder(
table,
self.transaction_log_cls,
self.transaction_changes_cls
)