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from .partition import PostgresPartitionOperation
class PostgresDeletePartition(PostgresPartitionOperation):
"""Deletes a partition that's part of a :see:PartitionedPostgresModel."""
def state_forwards(self, app_label, state):
model = state.models[(app_label, self.model_name_lower)]
model.delete_partition(self.name)
state.reload_model(app_label, self.model_name_lower)
def database_forwards(self, app_label, schema_editor, from_state, to_state):
model = from_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, model):
schema_editor.delete_partition(model, self.name)
def database_backwards(
self, app_label, schema_editor, from_state, to_state
):
model = to_state.apps.get_model(app_label, self.model_name)
model_state = to_state.models[(app_label, self.model_name)]
if self.allow_migrate_model(schema_editor.connection.alias, model):
partition_state = model_state.partitions[self.name]
schema_editor.add_default_partition(model, partition_state.name)
def describe(self) -> str:
return "Deletes partition %s on %s" % (self.name, self.model_name)
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