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import django
import pytest
from django.apps import apps
from django.db import models
from django.db.migrations import AddField, AlterField, RemoveField
from django.db.migrations.state import ProjectState
from psqlextra.backend.migrations import operations, postgres_patched_migrations
from psqlextra.models import (
PostgresMaterializedViewModel,
PostgresPartitionedModel,
PostgresViewModel,
)
from psqlextra.types import PostgresPartitioningMethod
from .fake_model import (
define_fake_materialized_view_model,
define_fake_model,
define_fake_partitioned_model,
define_fake_view_model,
get_fake_model,
)
from .migrations import apply_migration, make_migration
@pytest.mark.parametrize(
"model_config",
[
dict(
fields={"category": models.TextField()},
partitioning_options=dict(
method=PostgresPartitioningMethod.LIST, key="category"
),
),
dict(
fields={"timestamp": models.DateTimeField()},
partitioning_options=dict(
method=PostgresPartitioningMethod.RANGE, key="timestamp"
),
),
dict(
fields={"artist_id": models.IntegerField()},
partitioning_options=dict(
method=PostgresPartitioningMethod.HASH, key="artist_id"
),
),
],
)
@postgres_patched_migrations()
def test_make_migration_create_partitioned_model(fake_app, model_config):
"""Tests whether the right operations are generated when creating a new
partitioned model."""
model = define_fake_partitioned_model(
**model_config, meta_options=dict(app_label=fake_app.name)
)
migration = make_migration(fake_app.name)
ops = migration.operations
method = model_config["partitioning_options"]["method"]
if method == PostgresPartitioningMethod.HASH:
# should have one operation to create the partitioned model
# and no default partition
assert len(ops) == 1
assert isinstance(ops[0], operations.PostgresCreatePartitionedModel)
else:
# should have one operation to create the partitioned model
# and one more to add a default partition
assert len(ops) == 2
assert isinstance(ops[0], operations.PostgresCreatePartitionedModel)
assert isinstance(ops[1], operations.PostgresAddDefaultPartition)
# make sure the default partition is named "default"
assert ops[1].model_name == model.__name__
assert ops[1].name == "default"
# make sure the base is set correctly
assert len(ops[0].bases) == 1
assert issubclass(ops[0].bases[0], PostgresPartitionedModel)
# make sure the partitioning options got copied correctly
assert ops[0].partitioning_options == model_config["partitioning_options"]
@postgres_patched_migrations()
def test_make_migration_create_view_model(fake_app):
"""Tests whether the right operations are generated when creating a new
view model."""
underlying_model = get_fake_model({"name": models.TextField()})
model = define_fake_view_model(
fields={"name": models.TextField()},
view_options=dict(query=underlying_model.objects.all()),
meta_options=dict(app_label=fake_app.name),
)
migration = make_migration(model._meta.app_label)
ops = migration.operations
assert len(ops) == 1
assert isinstance(ops[0], operations.PostgresCreateViewModel)
# make sure the base is set correctly
assert len(ops[0].bases) == 1
assert issubclass(ops[0].bases[0], PostgresViewModel)
# make sure the view options got copied correctly
assert ops[0].view_options == model._view_meta.original_attrs
@postgres_patched_migrations()
def test_make_migration_create_materialized_view_model(fake_app):
"""Tests whether the right operations are generated when creating a new
materialized view model."""
underlying_model = get_fake_model({"name": models.TextField()})
model = define_fake_materialized_view_model(
fields={"name": models.TextField()},
view_options=dict(query=underlying_model.objects.all()),
meta_options=dict(app_label=fake_app.name),
)
migration = make_migration(model._meta.app_label)
ops = migration.operations
assert len(ops) == 1
assert isinstance(ops[0], operations.PostgresCreateMaterializedViewModel)
# make sure the base is set correctly
assert len(ops[0].bases) == 1
assert issubclass(ops[0].bases[0], PostgresMaterializedViewModel)
# make sure the view options got copied correctly
assert ops[0].view_options == model._view_meta.original_attrs
@pytest.mark.parametrize(
"define_view_model",
[define_fake_materialized_view_model, define_fake_view_model],
)
@postgres_patched_migrations()
def test_make_migration_field_operations_view_models(
fake_app, define_view_model
):
"""Tests whether field operations against a (materialized) view are always
wrapped in the :see:ApplyState operation so that they don't actually get
applied to the database, yet Django applies to them to the project state.
This is important because you can't actually alter/add or delete
fields from a (materialized) view.
"""
underlying_model = get_fake_model(
{"first_name": models.TextField(), "last_name": models.TextField()},
meta_options=dict(app_label=fake_app.name),
)
model = define_view_model(
fields={"first_name": models.TextField()},
view_options=dict(query=underlying_model.objects.all()),
meta_options=dict(app_label=fake_app.name),
)
state_1 = ProjectState.from_apps(apps)
migration = make_migration(model._meta.app_label)
apply_migration(migration.operations, state_1)
# add a field to the materialized view
last_name_field = models.TextField(null=True)
last_name_field.contribute_to_class(model, "last_name")
migration = make_migration(model._meta.app_label, from_state=state_1)
assert len(migration.operations) == 1
assert isinstance(migration.operations[0], operations.ApplyState)
assert isinstance(migration.operations[0].state_operation, AddField)
# alter the field on the materialized view
state_2 = ProjectState.from_apps(apps)
last_name_field = models.TextField(null=True, blank=True)
last_name_field.contribute_to_class(model, "last_name")
migration = make_migration(model._meta.app_label, from_state=state_2)
assert len(migration.operations) == 1
assert isinstance(migration.operations[0], operations.ApplyState)
assert isinstance(migration.operations[0].state_operation, AlterField)
# remove the field from the materialized view
migration = make_migration(
model._meta.app_label,
from_state=ProjectState.from_apps(apps),
to_state=state_1,
)
assert isinstance(migration.operations[0], operations.ApplyState)
assert isinstance(migration.operations[0].state_operation, RemoveField)
@pytest.mark.skipif(
django.VERSION < (2, 2),
reason="Django < 2.2 doesn't implement left-to-right migration optimizations",
)
@pytest.mark.parametrize("method", PostgresPartitioningMethod.all())
@postgres_patched_migrations()
def test_autodetect_fk_issue(fake_app, method):
"""Test whether Django can perform ForeignKey optimization.
Fixes https://github.com/SectorLabs/django-postgres-extra/issues/123 for Django >= 2.2
"""
meta_options = {"app_label": fake_app.name}
partitioning_options = {"method": method, "key": "artist_id"}
artist_model_fields = {"name": models.TextField()}
Artist = define_fake_model(artist_model_fields, meta_options=meta_options)
from_state = ProjectState.from_apps(apps)
album_model_fields = {
"name": models.TextField(),
"artist": models.ForeignKey(
to=Artist.__name__, on_delete=models.CASCADE
),
}
define_fake_partitioned_model(
album_model_fields,
partitioning_options=partitioning_options,
meta_options=meta_options,
)
migration = make_migration(fake_app.name, from_state=from_state)
ops = migration.operations
if method == PostgresPartitioningMethod.HASH:
assert len(ops) == 1
assert isinstance(ops[0], operations.PostgresCreatePartitionedModel)
else:
assert len(ops) == 2
assert isinstance(ops[0], operations.PostgresCreatePartitionedModel)
assert isinstance(ops[1], operations.PostgresAddDefaultPartition)
|
