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from psqlextra.backend.migrations.state import PostgresRangePartitionState
from .partition import PostgresPartitionOperation
class PostgresAddRangePartition(PostgresPartitionOperation):
"""Adds a new range partition to a :see:PartitionedPostgresModel."""
def __init__(self, model_name: str, name: str, from_values, to_values):
"""Initializes new instance of :see:AddRangePartition.
Arguments:
model_name:
The name of the :see:PartitionedPostgresModel.
name:
The name to give to the new partition table.
from_values:
Start of the partitioning key range of
values that need to be stored in this
partition.
to_values:
End of the partitioning key range of
values that need to be stored in this
partition.
"""
super().__init__(model_name, name)
self.from_values = from_values
self.to_values = to_values
def state_forwards(self, app_label, state):
model = state.models[(app_label, self.model_name_lower)]
model.add_partition(
PostgresRangePartitionState(
app_label=app_label,
model_name=self.model_name,
name=self.name,
from_values=self.from_values,
to_values=self.to_values,
)
)
state.reload_model(app_label, self.model_name_lower)
def database_forwards(self, app_label, schema_editor, from_state, to_state):
model = to_state.apps.get_model(app_label, self.model_name)
if self.allow_migrate_model(schema_editor.connection.alias, model):
schema_editor.add_range_partition(
model, self.name, self.from_values, self.to_values
)
def database_backwards(
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 deconstruct(self):
name, args, kwargs = super().deconstruct()
kwargs["from_values"] = self.from_values
kwargs["to_values"] = self.to_values
return name, args, kwargs
def describe(self) -> str:
return "Creates range partition %s on %s" % (self.name, self.model_name)
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