def __init__(self, using='default', loader=None, executor=None):
connection = connections[using]
self._loader = loader or django_migration_loader.MigrationLoader(
connection, ignore_no_migrations=True
)
self._graph = self._loader.graph
self._executor = django_migration_executor.MigrationExecutor(connection)
self._docs = MigrationDocs()
self._migrations = {
str(node): Migration(
node,
executor=self._executor,
loader=self._loader,
docs=self._docs,
)
for node in self._graph.nodes.values()
}
# Construct a plan of migrations. Set the ``data`` as the plan so
# that this datastructure is a list
targets = self._graph.leaf_nodes()
self.data = []
seen = set()
for target in targets:
for migration in self._graph.forwards_plan(target):
if migration not in seen: # pragma: no branch
# We don't cover the "else" branch of this statement since
# our test models dont have complex enough migrations
self.data.append(self._migrations[str(self._graph.nodes[migration])])
seen.add(migration)
def initial_django_migration(database):
""" Check if we ever executed an initial django migration. """
from django.db.migrations import loader # pylint: disable=E0611
loader = loader.MigrationLoader(django.db.connections[database])
return len(loader.applied_migrations) == 0