Refs -- Optimized sqlmigrate by using MigrationLoader.
Only loader from MigrationExecutor was used.
from django.apps import apps
from django.core.management.base import BaseCommand, CommandError
from django.db import DEFAULT_DB_ALIAS, connections
-from django.db.migrations.executor import MigrationExecutor
-from django.db.migrations.loader import AmbiguityError
+from django.db.migrations.loader import AmbiguityError, MigrationLoader
class Command(BaseCommand):
@@ -33,8 +32,8 @@ class Command(BaseCommand):
# Get the database we're operating from
connection = connections[options['database']]
- # Load up an executor to get all the migration data
- executor = MigrationExecutor(connection)
+ # Load up an loader to get all the migration data
+ loader = MigrationLoader(connection)
# Resolve command-line arguments into a migration
app_label, migration_name = options['app_label'], options['migration_name']
@@ -43,10 +42,10 @@ class Command(BaseCommand):
apps.get_app_config(app_label)
except LookupError as err:
raise CommandError(str(err))
- if app_label not in executor.loader.migrated_apps:
+ if app_label not in loader.migrated_apps:
raise CommandError("App '%s' does not have migrations" % app_label)
try:
- migration = executor.loader.get_migration_by_prefix(app_label, migration_name)
+ migration = loader.get_migration_by_prefix(app_label, migration_name)
except AmbiguityError:
raise CommandError("More than one migration matches '%s' in app '%s'. Please be more specific." % (
migration_name, app_label))
@@ -61,8 +60,8 @@ class Command(BaseCommand):
# Make a plan that represents just the requested migrations and show SQL
# for it
- plan = [(executor.loader.graph.nodes[target], options['backwards'])]
- sql_statements = executor.loader.collect_sql(plan)
+ plan = [(loader.graph.nodes[target], options['backwards'])]
+ sql_statements = loader.collect_sql(plan)
if not sql_statements and options['verbosity'] >= 1:
self.stderr.write('No operations found.')
return '\n'.join(sql_statements)
