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ladeng07
2022-05-06 15:45:57 +08:00
parent 12f390949b
commit 51552904f9
2347 changed files with 120102 additions and 53549 deletions
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venv/Lib/site-packages/django/db/migrations/loader.py
+32 -64
View File
@@ -8,13 +8,11 @@ from django.db.migrations.graph import MigrationGraph
from django.db.migrations.recorder import MigrationRecorder
from .exceptions import (
AmbiguityError,
BadMigrationError,
InconsistentMigrationHistory,
AmbiguityError, BadMigrationError, InconsistentMigrationHistory,
NodeNotFoundError,
)
MIGRATIONS_MODULE_NAME = "migrations"
MIGRATIONS_MODULE_NAME = 'migrations'
class MigrationLoader:
@@ -43,10 +41,7 @@ class MigrationLoader:
"""
def __init__(
self,
connection,
load=True,
ignore_no_migrations=False,
self, connection, load=True, ignore_no_migrations=False,
replace_migrations=True,
):
self.connection = connection
@@ -68,7 +63,7 @@ class MigrationLoader:
return settings.MIGRATION_MODULES[app_label], True
else:
app_package_name = apps.get_app_config(app_label).name
return "%s.%s" % (app_package_name, MIGRATIONS_MODULE_NAME), False
return '%s.%s' % (app_package_name, MIGRATIONS_MODULE_NAME), False
def load_disk(self):
"""Load the migrations from all INSTALLED_APPS from disk."""
@@ -85,22 +80,24 @@ class MigrationLoader:
try:
module = import_module(module_name)
except ModuleNotFoundError as e:
if (explicit and self.ignore_no_migrations) or (
not explicit and MIGRATIONS_MODULE_NAME in e.name.split(".")
if (
(explicit and self.ignore_no_migrations) or
(not explicit and MIGRATIONS_MODULE_NAME in e.name.split('.'))
):
self.unmigrated_apps.add(app_config.label)
continue
raise
else:
# Module is not a package (e.g. migrations.py).
if not hasattr(module, "__path__"):
if not hasattr(module, '__path__'):
self.unmigrated_apps.add(app_config.label)
continue
# Empty directories are namespaces. Namespace packages have no
# __file__ and don't use a list for __path__. See
# https://docs.python.org/3/reference/import.html#namespace-packages
if getattr(module, "__file__", None) is None and not isinstance(
module.__path__, list
if (
getattr(module, '__file__', None) is None and
not isinstance(module.__path__, list)
):
self.unmigrated_apps.add(app_config.label)
continue
@@ -109,17 +106,16 @@ class MigrationLoader:
reload(module)
self.migrated_apps.add(app_config.label)
migration_names = {
name
for _, name, is_pkg in pkgutil.iter_modules(module.__path__)
if not is_pkg and name[0] not in "_~"
name for _, name, is_pkg in pkgutil.iter_modules(module.__path__)
if not is_pkg and name[0] not in '_~'
}
# Load migrations
for migration_name in migration_names:
migration_path = "%s.%s" % (module_name, migration_name)
migration_path = '%s.%s' % (module_name, migration_name)
try:
migration_module = import_module(migration_path)
except ImportError as e:
if "bad magic number" in str(e):
if 'bad magic number' in str(e):
raise ImportError(
"Couldn't import %r as it appears to be a stale "
".pyc file." % migration_path
@@ -128,12 +124,9 @@ class MigrationLoader:
raise
if not hasattr(migration_module, "Migration"):
raise BadMigrationError(
"Migration %s in app %s has no Migration class"
% (migration_name, app_config.label)
"Migration %s in app %s has no Migration class" % (migration_name, app_config.label)
)
self.disk_migrations[
app_config.label, migration_name
] = migration_module.Migration(
self.disk_migrations[app_config.label, migration_name] = migration_module.Migration(
migration_name,
app_config.label,
)
@@ -149,20 +142,14 @@ class MigrationLoader:
# Do the search
results = []
for migration_app_label, migration_name in self.disk_migrations:
if migration_app_label == app_label and migration_name.startswith(
name_prefix
):
if migration_app_label == app_label and migration_name.startswith(name_prefix):
results.append((migration_app_label, migration_name))
if len(results) > 1:
raise AmbiguityError(
"There is more than one migration for '%s' with the prefix '%s'"
% (app_label, name_prefix)
"There is more than one migration for '%s' with the prefix '%s'" % (app_label, name_prefix)
)
elif not results:
raise KeyError(
f"There is no migration for '{app_label}' with the prefix "
f"'{name_prefix}'"
)
raise KeyError("There no migrations for '%s' with the prefix '%s'" % (app_label, name_prefix))
else:
return self.disk_migrations[results[0]]
@@ -191,9 +178,7 @@ class MigrationLoader:
if self.ignore_no_migrations:
return None
else:
raise ValueError(
"Dependency on app with no migrations: %s" % key[0]
)
raise ValueError("Dependency on app with no migrations: %s" % key[0])
raise ValueError("Dependency on unknown app: %s" % key[0])
def add_internal_dependencies(self, key, migration):
@@ -203,7 +188,7 @@ class MigrationLoader:
"""
for parent in migration.dependencies:
# Ignore __first__ references to the same app.
if parent[0] == key[0] and parent[1] != "__first__":
if parent[0] == key[0] and parent[1] != '__first__':
self.graph.add_dependency(migration, key, parent, skip_validation=True)
def add_external_dependencies(self, key, migration):
@@ -253,9 +238,7 @@ class MigrationLoader:
for key, migration in self.replacements.items():
# Get applied status of each of this migration's replacement
# targets.
applied_statuses = [
(target in self.applied_migrations) for target in migration.replaces
]
applied_statuses = [(target in self.applied_migrations) for target in migration.replaces]
# The replacing migration is only marked as applied if all of
# its replacement targets are.
if all(applied_statuses):
@@ -287,11 +270,9 @@ class MigrationLoader:
# Try to reraise exception with more detail.
if exc.node in reverse_replacements:
candidates = reverse_replacements.get(exc.node, set())
is_replaced = any(
candidate in self.graph.nodes for candidate in candidates
)
is_replaced = any(candidate in self.graph.nodes for candidate in candidates)
if not is_replaced:
tries = ", ".join("%s.%s" % c for c in candidates)
tries = ', '.join('%s.%s' % c for c in candidates)
raise NodeNotFoundError(
"Migration {0} depends on nonexistent node ('{1}', '{2}'). "
"Django tried to replace migration {1}.{2} with any of [{3}] "
@@ -299,7 +280,7 @@ class MigrationLoader:
"are already applied.".format(
exc.origin, exc.node[0], exc.node[1], tries
),
exc.node,
exc.node
) from exc
raise
self.graph.ensure_not_cyclic()
@@ -320,17 +301,12 @@ class MigrationLoader:
# Skip unapplied squashed migrations that have all of their
# `replaces` applied.
if parent in self.replacements:
if all(
m in applied for m in self.replacements[parent].replaces
):
if all(m in applied for m in self.replacements[parent].replaces):
continue
raise InconsistentMigrationHistory(
"Migration {}.{} is applied before its dependency "
"{}.{} on database '{}'.".format(
migration[0],
migration[1],
parent[0],
parent[1],
migration[0], migration[1], parent[0], parent[1],
connection.alias,
)
)
@@ -347,9 +323,7 @@ class MigrationLoader:
if app_label in seen_apps:
conflicting_apps.add(app_label)
seen_apps.setdefault(app_label, set()).add(migration_name)
return {
app_label: sorted(seen_apps[app_label]) for app_label in conflicting_apps
}
return {app_label: sorted(seen_apps[app_label]) for app_label in conflicting_apps}
def project_state(self, nodes=None, at_end=True):
"""
@@ -358,9 +332,7 @@ class MigrationLoader:
See graph.make_state() for the meaning of "nodes" and "at_end".
"""
return self.graph.make_state(
nodes=nodes, at_end=at_end, real_apps=self.unmigrated_apps
)
return self.graph.make_state(nodes=nodes, at_end=at_end, real_apps=list(self.unmigrated_apps))
def collect_sql(self, plan):
"""
@@ -370,13 +342,9 @@ class MigrationLoader:
statements = []
state = None
for migration, backwards in plan:
with self.connection.schema_editor(
collect_sql=True, atomic=migration.atomic
) as schema_editor:
with self.connection.schema_editor(collect_sql=True, atomic=migration.atomic) as schema_editor:
if state is None:
state = self.project_state(
(migration.app_label, migration.name), at_end=False
)
state = self.project_state((migration.app_label, migration.name), at_end=False)
if not backwards:
state = migration.apply(state, schema_editor, collect_sql=True)
else: