def show_list(self, connection, app_names=None):
"""
Shows a list of all migrations on the system, or only those of
some named apps.
"""
# Load migrations from disk/DB
loader = MigrationLoader(connection, ignore_no_migrations=True)
graph = loader.graph
# If we were passed a list of apps, validate it
if app_names:
invalid_apps = []
for app_name in app_names:
if app_name not in loader.migrated_apps:
invalid_apps.append(app_name)
if invalid_apps:
raise CommandError("No migrations present for: %s" % (", ".join(invalid_apps)))
# Otherwise, show all apps in alphabetic order
else:
app_names = sorted(loader.migrated_apps)
# For each app, print its migrations in order from oldest (roots) to
# newest (leaves).
for app_name in app_names:
self.stdout.write(app_name, self.style.MIGRATE_LABEL)
shown = set()
for node in graph.leaf_nodes(app_name):
for plan_node in graph.forwards_plan(node):
if plan_node not in shown and plan_node[0] == app_name:
# Give it a nice title if it's a squashed one
title = plan_node[1]
if graph.nodes[plan_node].replaces:
title += " (%s squashed migrations)" % len(graph.nodes[plan_node].replaces)
# Mark it as applied/unapplied
if plan_node in loader.applied_migrations:
self.stdout.write(" [X] %s" % title)
else:
self.stdout.write(" [ ] %s" % title)
shown.add(plan_node)
# If we didn't print anything, then a small message
if not shown:
self.stdout.write(" (no migrations)", self.style.MIGRATE_FAILURE)
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