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Refs #24554 -- Prevented rendering of unused migrations

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Thanks Claude Paroz and Tim Graham for the review
This commit is contained in:
Markus Holtermann
2015-03-31 23:35:48 +02:00
parent 57dc8dd3fa
commit 3e7d9d05ac
1 changed files with 9 additions and 0 deletions
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9
django/db/migrations/executor.py
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@@ -86,11 +86,20 @@ class MigrationExecutor(object):
# models will be recursively reloaded as explained in
# `django.db.migrations.state.get_related_models_recursive()`.
for migration, _ in full_plan:
if not migrations_to_run:
# We remove every migration whose state was already computed
# from the set below (`migrations_to_run.remove(migration)`).
# If no states for migrations must be computed, we can exit
# this loop. Migrations that occur after the latest migration
# that is about to be applied would only trigger unneeded
# mutate_state() calls.
break
do_run = migration in migrations_to_run
if do_run:
if 'apps' not in state.__dict__:
state.apps # Render all real_apps -- performance critical
states[migration] = state.clone()
migrations_to_run.remove(migration)
# Only preserve the state if the migration is being run later
state = migration.mutate_state(state, preserve=do_run)
if self.progress_callback: