Figure out which databases actually need to be created. Deduplicate entries in DATABASES that correspond the same database or are configured as test mirrors. Return two values: - test_databases: ordered mapping of signatures to (name, list of aliases) whe
(aliases=None)
| 325 | |
| 326 | |
| 327 | def get_unique_databases_and_mirrors(aliases=None): |
| 328 | """ |
| 329 | Figure out which databases actually need to be created. |
| 330 | |
| 331 | Deduplicate entries in DATABASES that correspond the same database or are |
| 332 | configured as test mirrors. |
| 333 | |
| 334 | Return two values: |
| 335 | - test_databases: ordered mapping of signatures to (name, list of aliases) |
| 336 | where all aliases share the same underlying database. |
| 337 | - mirrored_aliases: mapping of mirror aliases to original aliases. |
| 338 | """ |
| 339 | if aliases is None: |
| 340 | aliases = connections |
| 341 | mirrored_aliases = {} |
| 342 | test_databases = {} |
| 343 | dependencies = {} |
| 344 | default_sig = connections[DEFAULT_DB_ALIAS].creation.test_db_signature() |
| 345 | |
| 346 | for alias in connections: |
| 347 | connection = connections[alias] |
| 348 | test_settings = connection.settings_dict["TEST"] |
| 349 | |
| 350 | if test_settings["MIRROR"]: |
| 351 | # If the database is marked as a test mirror, save the alias. |
| 352 | mirrored_aliases[alias] = test_settings["MIRROR"] |
| 353 | elif alias in aliases: |
| 354 | # Store a tuple with DB parameters that uniquely identify it. |
| 355 | # If we have two aliases with the same values for that tuple, |
| 356 | # we only need to create the test database once. |
| 357 | item = test_databases.setdefault( |
| 358 | connection.creation.test_db_signature(), |
| 359 | (connection.settings_dict["NAME"], []), |
| 360 | ) |
| 361 | # The default database must be the first because data migrations |
| 362 | # use the default alias by default. |
| 363 | if alias == DEFAULT_DB_ALIAS: |
| 364 | item[1].insert(0, alias) |
| 365 | else: |
| 366 | item[1].append(alias) |
| 367 | |
| 368 | if "DEPENDENCIES" in test_settings: |
| 369 | dependencies[alias] = test_settings["DEPENDENCIES"] |
| 370 | else: |
| 371 | if ( |
| 372 | alias != DEFAULT_DB_ALIAS |
| 373 | and connection.creation.test_db_signature() != default_sig |
| 374 | ): |
| 375 | dependencies[alias] = test_settings.get( |
| 376 | "DEPENDENCIES", [DEFAULT_DB_ALIAS] |
| 377 | ) |
| 378 | |
| 379 | test_databases = dict(dependency_ordered(test_databases.items(), dependencies)) |
| 380 | return test_databases, mirrored_aliases |
| 381 | |
| 382 | |
| 383 | def teardown_databases(old_config, verbosity, parallel=0, keepdb=False): |