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import os
import sys
import uuid
from contextlib import contextmanager
from typing import Type
from django.apps import AppConfig, apps
from django.db import connection, models
from psqlextra.models import (
PostgresMaterializedViewModel,
PostgresModel,
PostgresPartitionedModel,
PostgresViewModel,
)
def define_fake_model(
fields=None, model_base=PostgresModel, meta_options={}, **attributes
):
"""Defines a fake model (but does not create it in the database)."""
name = str(uuid.uuid4()).replace("-", "")[:8].title()
attributes = {
"app_label": meta_options.get("app_label") or "tests",
"__module__": __name__,
"__name__": name,
"Meta": type("Meta", (object,), meta_options),
**attributes,
}
if fields:
attributes.update(fields)
model = type(name, (model_base,), attributes)
apps.app_configs[attributes["app_label"]].models[name] = model
return model
def undefine_fake_model(model: Type[models.Model]) -> None:
"""Removes the fake model from the app registry."""
app_label = model._meta.app_label or "tests"
app_models = apps.app_configs[app_label].models
for model_name in [model.__name__, model.__name__.lower()]:
if model_name in app_models:
del app_models[model_name]
def define_fake_view_model(
fields=None, view_options={}, meta_options={}, model_base=PostgresViewModel
):
"""Defines a fake view model."""
model = define_fake_model(
fields=fields,
model_base=model_base,
meta_options=meta_options,
ViewMeta=type("ViewMeta", (object,), view_options),
)
return model
def define_fake_materialized_view_model(
fields=None,
view_options={},
meta_options={},
model_base=PostgresMaterializedViewModel,
):
"""Defines a fake materialized view model."""
model = define_fake_model(
fields=fields,
model_base=model_base,
meta_options=meta_options,
ViewMeta=type("ViewMeta", (object,), view_options),
)
return model
def define_fake_partitioned_model(
fields=None, partitioning_options={}, meta_options={}
):
"""Defines a fake partitioned model."""
model = define_fake_model(
fields=fields,
model_base=PostgresPartitionedModel,
meta_options=meta_options,
PartitioningMeta=type(
"PartitioningMeta", (object,), partitioning_options
),
)
return model
def get_fake_partitioned_model(
fields=None, partitioning_options={}, meta_options={}
):
"""Defines a fake partitioned model and creates it in the database."""
model = define_fake_partitioned_model(
fields, partitioning_options, meta_options
)
with connection.schema_editor() as schema_editor:
schema_editor.create_model(model)
return model
def get_fake_model(fields=None, model_base=PostgresModel, meta_options={}):
"""Defines a fake model and creates it in the database."""
model = define_fake_model(fields, model_base, meta_options)
with connection.schema_editor() as schema_editor:
schema_editor.create_model(model)
return model
def delete_fake_model(model: Type[models.Model]) -> None:
"""Deletes a fake model from the database and the internal app registry."""
undefine_fake_model(model)
with connection.schema_editor() as schema_editor:
schema_editor.delete_model(model)
@contextmanager
def define_fake_app():
"""Creates and registers a fake Django app."""
name = "app_" + str(uuid.uuid4()).replace("-", "")[:8]
app_config_cls = type(
name + "Config",
(AppConfig,),
{"name": name, "path": os.path.dirname(__file__)},
)
app_config = app_config_cls(name, "")
app_config.apps = apps
app_config.models = {}
apps.app_configs[name] = app_config
sys.modules[name] = {}
try:
yield app_config
finally:
del apps.app_configs[name]
del sys.modules[name]
|
