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230 lines
10 KiB
Python
230 lines
10 KiB
Python
5 years ago
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"""
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Startmigration command, version 2.
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"""
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from __future__ import print_function
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import sys
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import os
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import re
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import string
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import random
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import inspect
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from optparse import make_option
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try:
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set
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except NameError:
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from sets import Set as set
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from django.core.management.base import BaseCommand
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from django.core.management.color import no_style
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from django.core.exceptions import ImproperlyConfigured
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from django.db import models
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from django.conf import settings
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from south.migration import Migrations, migrate_app
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from south.models import MigrationHistory
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from south.exceptions import NoMigrations
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from south.creator import changes, actions, freezer
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from south.management.commands.datamigration import Command as DataCommand
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class Command(DataCommand):
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option_list = DataCommand.option_list + (
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make_option('--add-model', action='append', dest='added_model_list', type='string',
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help='Generate a Create Table migration for the specified model. Add multiple models to this migration with subsequent --add-model parameters.'),
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make_option('--add-field', action='append', dest='added_field_list', type='string',
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help='Generate an Add Column migration for the specified modelname.fieldname - you can use this multiple times to add more than one column.'),
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make_option('--add-index', action='append', dest='added_index_list', type='string',
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help='Generate an Add Index migration for the specified modelname.fieldname - you can use this multiple times to add more than one column.'),
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make_option('--initial', action='store_true', dest='initial', default=False,
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help='Generate the initial schema for the app.'),
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make_option('--auto', action='store_true', dest='auto', default=False,
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help='Attempt to automatically detect differences from the last migration.'),
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make_option('--empty', action='store_true', dest='empty', default=False,
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help='Make a blank migration.'),
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make_option('--update', action='store_true', dest='update', default=False,
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help='Update the most recent migration instead of creating a new one. Rollback this migration if it is already applied.'),
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)
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help = "Creates a new template schema migration for the given app"
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usage_str = "Usage: ./manage.py schemamigration appname migrationname [--empty] [--initial] [--auto] [--add-model ModelName] [--add-field ModelName.field_name] [--stdout]"
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def handle(self, app=None, name="", added_model_list=None, added_field_list=None, freeze_list=None, initial=False, auto=False, stdout=False, added_index_list=None, verbosity=1, empty=False, update=False, **options):
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# Any supposed lists that are None become empty lists
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added_model_list = added_model_list or []
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added_field_list = added_field_list or []
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added_index_list = added_index_list or []
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freeze_list = freeze_list or []
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# --stdout means name = -
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if stdout:
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name = "-"
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# Only allow valid names
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if re.search('[^_\w]', name) and name != "-":
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self.error("Migration names should contain only alphanumeric characters and underscores.")
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# Make sure options are compatable
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if initial and (added_model_list or added_field_list or auto):
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self.error("You cannot use --initial and other options together\n" + self.usage_str)
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if auto and (added_model_list or added_field_list or initial):
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self.error("You cannot use --auto and other options together\n" + self.usage_str)
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if not app:
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self.error("You must provide an app to create a migration for.\n" + self.usage_str)
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# See if the app exists
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app = app.split(".")[-1]
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try:
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app_module = models.get_app(app)
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except ImproperlyConfigured:
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print("There is no enabled application matching '%s'." % app)
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return
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# Get the Migrations for this app (creating the migrations dir if needed)
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migrations = Migrations(app, force_creation=True, verbose_creation=int(verbosity) > 0)
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# What actions do we need to do?
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if auto:
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# Get the old migration
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try:
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last_migration = migrations[-2 if update else -1]
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except IndexError:
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self.error("You cannot use --auto on an app with no migrations. Try --initial.")
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# Make sure it has stored models
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if migrations.app_label() not in getattr(last_migration.migration_class(), "complete_apps", []):
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self.error("You cannot use automatic detection, since the previous migration does not have this whole app frozen.\nEither make migrations using '--freeze %s' or set 'SOUTH_AUTO_FREEZE_APP = True' in your settings.py." % migrations.app_label())
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# Alright, construct two model dicts to run the differ on.
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old_defs = dict(
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(k, v) for k, v in last_migration.migration_class().models.items()
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if k.split(".")[0] == migrations.app_label()
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)
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new_defs = dict(
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(k, v) for k, v in freezer.freeze_apps([migrations.app_label()]).items()
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if k.split(".")[0] == migrations.app_label()
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)
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change_source = changes.AutoChanges(
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migrations = migrations,
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old_defs = old_defs,
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old_orm = last_migration.orm(),
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new_defs = new_defs,
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)
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elif initial:
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# Do an initial migration
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change_source = changes.InitialChanges(migrations)
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else:
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# Read the commands manually off of the arguments
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if (added_model_list or added_field_list or added_index_list):
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change_source = changes.ManualChanges(
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migrations,
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added_model_list,
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added_field_list,
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added_index_list,
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)
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elif empty:
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change_source = None
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else:
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print("You have not passed any of --initial, --auto, --empty, --add-model, --add-field or --add-index.", file=sys.stderr)
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sys.exit(1)
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# Validate this so we can access the last migration without worrying
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if update and not migrations:
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self.error("You cannot use --update on an app with no migrations.")
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# if not name, there's an error
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if not name:
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if change_source:
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name = change_source.suggest_name()
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if update:
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name = re.sub(r'^\d{4}_', '', migrations[-1].name())
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if not name:
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self.error("You must provide a name for this migration\n" + self.usage_str)
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# Get the actions, and then insert them into the actions lists
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forwards_actions = []
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backwards_actions = []
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if change_source:
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for action_name, params in change_source.get_changes():
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# Run the correct Action class
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try:
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action_class = getattr(actions, action_name)
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except AttributeError:
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raise ValueError("Invalid action name from source: %s" % action_name)
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else:
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action = action_class(**params)
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action.add_forwards(forwards_actions)
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action.add_backwards(backwards_actions)
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print(action.console_line(), file=sys.stderr)
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# Nowt happen? That's not good for --auto.
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if auto and not forwards_actions:
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self.error("Nothing seems to have changed.")
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# Work out which apps to freeze
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apps_to_freeze = self.calc_frozen_apps(migrations, freeze_list)
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# So, what's in this file, then?
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file_contents = self.get_migration_template() % {
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"forwards": "\n".join(forwards_actions or [" pass"]),
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"backwards": "\n".join(backwards_actions or [" pass"]),
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"frozen_models": freezer.freeze_apps_to_string(apps_to_freeze),
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"complete_apps": apps_to_freeze and "complete_apps = [%s]" % (", ".join(map(repr, apps_to_freeze))) or ""
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}
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# Deal with update mode as late as possible, avoid a rollback as long
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# as something else can go wrong.
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if update:
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last_migration = migrations[-1]
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if MigrationHistory.objects.filter(applied__isnull=False, app_name=app, migration=last_migration.name()):
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print("Migration to be updated, %s, is already applied, rolling it back now..." % last_migration.name(), file=sys.stderr)
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migrate_app(migrations, 'current-1', verbosity=verbosity)
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for ext in ('py', 'pyc'):
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old_filename = "%s.%s" % (os.path.join(migrations.migrations_dir(), last_migration.filename), ext)
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if os.path.isfile(old_filename):
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os.unlink(old_filename)
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migrations.remove(last_migration)
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# See what filename is next in line. We assume they use numbers.
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new_filename = migrations.next_filename(name)
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# - is a special name which means 'print to stdout'
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if name == "-":
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print(file_contents)
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# Write the migration file if the name isn't -
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else:
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fp = open(os.path.join(migrations.migrations_dir(), new_filename), "w")
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fp.write(file_contents)
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fp.close()
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verb = 'Updated' if update else 'Created'
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if empty:
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print("%s %s. You must now edit this migration and add the code for each direction." % (verb, new_filename), file=sys.stderr)
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else:
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print("%s %s. You can now apply this migration with: ./manage.py migrate %s" % (verb, new_filename, app), file=sys.stderr)
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def get_migration_template(self):
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return MIGRATION_TEMPLATE
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MIGRATION_TEMPLATE = """# -*- coding: utf-8 -*-
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from south.utils import datetime_utils as datetime
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from south.db import db
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from south.v2 import SchemaMigration
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from django.db import models
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class Migration(SchemaMigration):
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def forwards(self, orm):
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%(forwards)s
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def backwards(self, orm):
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%(backwards)s
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models = %(frozen_models)s
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%(complete_apps)s"""
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