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from django.db.migrations.operations.models import CreateModel
from psqlextra.backend.migrations.state import PostgresPartitionedModelState
class PostgresCreatePartitionedModel(CreateModel):
"""Creates the model as a native PostgreSQL 11.x partitioned table."""
serialization_expand_args = [
"fields",
"options",
"managers",
"partitioning_options",
]
def __init__(
self,
name,
fields,
options=None,
partitioning_options={},
bases=None,
managers=None,
):
super().__init__(name, fields, options, bases, managers)
self.partitioning_options = partitioning_options or {}
def state_forwards(self, app_label, state):
state.add_model(
PostgresPartitionedModelState(
app_label=app_label,
name=self.name,
fields=list(self.fields),
options=dict(self.options),
bases=tuple(self.bases),
managers=list(self.managers),
partitioning_options=dict(self.partitioning_options),
)
)
def database_forwards(self, app_label, schema_editor, from_state, to_state):
"""Apply this migration operation forwards."""
model = to_state.apps.get_model(app_label, self.name)
if self.allow_migrate_model(schema_editor.connection.alias, model):
schema_editor.create_partitioned_model(model)
def database_backwards(
self, app_label, schema_editor, from_state, to_state
):
"""Apply this migration operation backwards."""
model = from_state.apps.get_model(app_label, self.name)
if self.allow_migrate_model(schema_editor.connection.alias, model):
schema_editor.delete_partitioned_model(model)
def deconstruct(self):
name, args, kwargs = super().deconstruct()
if self.partitioning_options:
kwargs["partitioning_options"] = self.partitioning_options
return name, args, kwargs
def describe(self):
"""Gets a human readable text describing this migration."""
description = super().describe()
description = description.replace("model", "partitioned model")
return description
def reduce(self, *args, **kwargs):
result = super().reduce(*args, **kwargs)
# replace CreateModel operation with PostgresCreatePartitionedModel
if isinstance(result, list) and result:
for i, op in enumerate(result):
if isinstance(op, CreateModel):
_, args, kwargs = op.deconstruct()
result[i] = PostgresCreatePartitionedModel(
*args,
**kwargs,
partitioning_options=self.partitioning_options
)
return result
|
