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Refs #24529 -- Added replace_migration hook to MigrationLoader.

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This commit is contained in:
Georgi Yanchev 2025-01-20 09:05:28 +01:00 committed by Sarah Boyce
parent 00c690efbc
commit 322785b08c
1 changed files with 24 additions and 21 deletions
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45
django/db/migrations/loader.py
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@ -219,6 +219,28 @@ class MigrationLoader:
if child is not None: if child is not None:
self.graph.add_dependency(migration, child, key, skip_validation=True) self.graph.add_dependency(migration, child, key, skip_validation=True)
def replace_migration(self, migration_key):
migration = self.replacements[migration_key]
# Get applied status of each found replacement target.
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 applied.
if all(applied_statuses):
self.applied_migrations[migration_key] = migration
else:
self.applied_migrations.pop(migration_key, None)
# A replacing migration can be used if either all or none of its
# replacement targets have been applied.
if all(applied_statuses) or (not any(applied_statuses)):
self.graph.remove_replaced_nodes(migration_key, migration.replaces)
else:
# This replacing migration cannot be used because it is
# partially applied. Remove it from the graph and remap
# dependencies to it (#25945).
self.graph.remove_replacement_node(migration_key, migration.replaces)
def build_graph(self): def build_graph(self):
""" """
Build a migration dependency graph using both the disk and database. Build a migration dependency graph using both the disk and database.
@ -250,27 +272,8 @@ class MigrationLoader:
self.add_external_dependencies(key, migration) self.add_external_dependencies(key, migration)
# Carry out replacements where possible and if enabled. # Carry out replacements where possible and if enabled.
if self.replace_migrations: if self.replace_migrations:
for key, migration in self.replacements.items(): for migration_key in self.replacements.keys():
# Get applied status of each of this migration's replacement self.replace_migration(migration_key)
# targets.
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):
self.applied_migrations[key] = migration
else:
self.applied_migrations.pop(key, None)
# A replacing migration can be used if either all or none of
# its replacement targets have been applied.
if all(applied_statuses) or (not any(applied_statuses)):
self.graph.remove_replaced_nodes(key, migration.replaces)
else:
# This replacing migration cannot be used because it is
# partially applied. Remove it from the graph and remap
# dependencies to it (#25945).
self.graph.remove_replacement_node(key, migration.replaces)
# Ensure the graph is consistent. # Ensure the graph is consistent.
try: try:
self.graph.validate_consistency() self.graph.validate_consistency()