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import pytest
from django.apps import apps
from django.db import connection, migrations, models
from psqlextra.backend.migrations import operations
from psqlextra.manager import PostgresManager
from psqlextra.models import PostgresPartitionedModel
from psqlextra.types import PostgresPartitioningMethod
from . import db_introspection
from .migrations import apply_migration
def _partitioned_table_exists(op: operations.PostgresCreatePartitionedModel):
"""Checks whether the specified partitioned model operation was succesfully
applied."""
model_table_name = f"tests_{op.name}"
table = db_introspection.get_partitioned_table(model_table_name)
if not table:
return False
part_options = op.partitioning_options
return (
table.method == part_options["method"]
and table.key == part_options["key"]
)
def _partition_exists(model_op, op):
"""Checks whether the parttitioned model and partition operations were
succesfully applied."""
model_table_name = f"tests_{model_op.name}"
table = db_introspection.get_partitioned_table(model_table_name)
if not table:
return False
partition = next(
(
partition
for partition in table.partitions
if partition.full_name == f"{model_table_name}_{op.name}"
),
None,
)
return bool(partition)
@pytest.fixture
def create_model():
"""Factory for creating a :see:PostgresCreatePartitionedModel operation."""
def _create_model(method):
fields = [("name", models.TextField())]
key = []
if method == PostgresPartitioningMethod.RANGE:
key.append("timestamp")
fields.append(("timestamp", models.DateTimeField()))
elif method == PostgresPartitioningMethod.LIST:
key.append("category")
fields.append(("category", models.TextField()))
elif method == PostgresPartitioningMethod.HASH:
key.append("artist_id")
fields.append(("artist_id", models.IntegerField()))
else:
raise NotImplementedError
return operations.PostgresCreatePartitionedModel(
"test",
fields=fields,
bases=(PostgresPartitionedModel,),
managers=[("objects", PostgresManager())],
partitioning_options={"method": method, "key": key},
)
return _create_model
@pytest.mark.postgres_version(lt=110000)
@pytest.mark.parametrize("method", PostgresPartitioningMethod.all())
def test_migration_operations_create_partitioned_table(method, create_model):
"""Tests whether the see :PostgresCreatePartitionedModel operation works as
expected in a migration."""
create_operation = create_model(method)
state = migrations.state.ProjectState.from_apps(apps)
# migrate forwards, is the table there?
apply_migration([create_operation], state)
assert _partitioned_table_exists(create_operation)
# migrate backwards, is the table there?
apply_migration([create_operation], state=state, backwards=True)
assert not _partitioned_table_exists(create_operation)
@pytest.mark.postgres_version(lt=110000)
@pytest.mark.parametrize("method", PostgresPartitioningMethod.all())
def test_migration_operations_delete_partitioned_table(method, create_model):
"""Tests whether the see :PostgresDeletePartitionedModel operation works as
expected in a migration."""
create_operation = create_model(method)
delete_operation = operations.PostgresDeletePartitionedModel(
create_operation.name
)
state = migrations.state.ProjectState.from_apps(apps)
# migrate forwards, create model
apply_migration([create_operation], state)
assert _partitioned_table_exists(create_operation)
# record intermediate state, the state we'll
# migrate backwards to
intm_state = state.clone()
# migrate forwards, delete model
apply_migration([delete_operation], state)
assert not _partitioned_table_exists(create_operation)
# migrate backwards, undelete model
delete_operation.database_backwards(
"tests", connection.schema_editor(), state, intm_state
)
assert _partitioned_table_exists(create_operation)
@pytest.mark.postgres_version(lt=110000)
@pytest.mark.parametrize(
"method,add_partition_operation",
[
(
PostgresPartitioningMethod.LIST,
operations.PostgresAddDefaultPartition(
model_name="test", name="pt1"
),
),
(
PostgresPartitioningMethod.RANGE,
operations.PostgresAddRangePartition(
model_name="test",
name="pt1",
from_values="2019-01-01",
to_values="2019-02-01",
),
),
(
PostgresPartitioningMethod.LIST,
operations.PostgresAddListPartition(
model_name="test", name="pt1", values=["car", "boat"]
),
),
(
PostgresPartitioningMethod.HASH,
operations.PostgresAddHashPartition(
model_name="test", name="pt1", modulus=3, remainder=0
),
),
],
)
def test_migration_operations_add_partition(
method, add_partition_operation, create_model
):
"""Tests whether adding partitions and then rolling them back works as
expected."""
create_operation = create_model(method)
state = migrations.state.ProjectState.from_apps(apps)
# migrate forwards
apply_migration([create_operation, add_partition_operation], state)
assert _partition_exists(create_operation, add_partition_operation)
# rollback
apply_migration(
[create_operation, add_partition_operation], state, backwards=True
)
assert not _partition_exists(create_operation, add_partition_operation)
@pytest.mark.postgres_version(lt=110000)
@pytest.mark.parametrize(
"method,add_partition_operation,delete_partition_operation",
[
(
PostgresPartitioningMethod.LIST,
operations.PostgresAddDefaultPartition(
model_name="test", name="pt1"
),
operations.PostgresDeleteDefaultPartition(
model_name="test", name="pt1"
),
),
(
PostgresPartitioningMethod.RANGE,
operations.PostgresAddRangePartition(
model_name="test",
name="pt1",
from_values="2019-01-01",
to_values="2019-02-01",
),
operations.PostgresDeleteRangePartition(
model_name="test", name="pt1"
),
),
(
PostgresPartitioningMethod.LIST,
operations.PostgresAddListPartition(
model_name="test", name="pt1", values=["car", "boat"]
),
operations.PostgresDeleteListPartition(
model_name="test", name="pt1"
),
),
(
PostgresPartitioningMethod.HASH,
operations.PostgresAddHashPartition(
model_name="test", name="pt1", modulus=3, remainder=0
),
operations.PostgresDeleteHashPartition(
model_name="test", name="pt1"
),
),
],
)
def test_migration_operations_add_delete_partition(
method, add_partition_operation, delete_partition_operation, create_model
):
"""Tests whether adding partitions and then removing them works as
expected."""
create_operation = create_model(method)
state = migrations.state.ProjectState.from_apps(apps)
# migrate forwards, create model and partition
apply_migration([create_operation, add_partition_operation], state)
assert _partition_exists(create_operation, add_partition_operation)
# record intermediate state, the state we'll
# migrate backwards to
intm_state = state.clone()
# migrate forwards, delete the partition
apply_migration([delete_partition_operation], state)
assert not _partition_exists(create_operation, add_partition_operation)
# migrate backwards, undelete the partition
delete_partition_operation.database_backwards(
"tests", connection.schema_editor(), state, intm_state
)
assert _partition_exists(create_operation, add_partition_operation)
|
