Python MigrationTracker.save方法代码示例

# 需要导入模块: from pulp.server.db.model.migration_tracker import MigrationTracker [as 别名]
# 或者: from pulp.server.db.model.migration_tracker.MigrationTracker import save [as 别名]
    def create(self, name, version):
        """
        Create and return a MigrationTracker with specified name and version.

        :param name:    The name of the package that the MigrationTracker is tracking.
        :type  name:    str
        :param version: The version we want to store on the new MigrationTracker.
        :type  version: int
        :rtype:         pulp.server.db.model.migration_tracker.MigrationTracker
        """
        new_mt = MigrationTracker(name=name, version=version)
        new_mt.save()
        return new_mt

# 需要导入模块: from pulp.server.db.model.migration_tracker import MigrationTracker [as 别名]
# 或者: from pulp.server.db.model.migration_tracker.MigrationTracker import save [as 别名]
 def test_save(self):
     # Make sure we are starting off clean
     self.assertEquals(MigrationTracker.get_collection().find({}).count(), 0)
     # Instantiate a MigrationTracker
     mt = MigrationTracker('meaning_of_life', 41)
     # At this point there should not be a MigrationTracker in the database
     self.assertEquals(mt.get_collection().find({}).count(), 0)
     # saving the mt should add it to the DB
     mt.save()
     self.assertEquals(mt.get_collection().find({}).count(), 1)
     mt_bson = mt.get_collection().find_one({'name': 'meaning_of_life'})
     self.assertEquals(mt_bson['name'], 'meaning_of_life')
     self.assertEquals(mt_bson['version'], 41)
     # now let's update the version to 42, the correct meaning of life
     mt.version = 42
     mt.save()
     # see if the updated meaning of life made it to the DB
     self.assertEquals(mt.get_collection().find({}).count(), 1)
     mt_bson = mt.get_collection().find_one({'name': 'meaning_of_life'})
     self.assertEquals(mt_bson['name'], 'meaning_of_life')
     self.assertEquals(mt_bson['version'], 42)

# 需要导入模块: from pulp.server.db.model.migration_tracker import MigrationTracker [as 别名]
# 或者: from pulp.server.db.model.migration_tracker.MigrationTracker import save [as 别名]
class MigrationPackage(object):
    """
    A wrapper around the migration packages found in pulp.server.db.migrations. Has methods to
    retrieve information about the migrations that are found there, and to apply the migrations.
    """
    class DuplicateVersions(Exception):
        """
        This is raised when a single migration package has two MigrationModules in it that have the
        same version.
        """
        pass

    class MissingVersion(Exception):
        """
        This is raised when a migration package has a gap in the MigrationModule versions.
        """
        pass

    def __init__(self, python_package):
        """
        Initialize the MigrationPackage to represent the Python migration package passed in.

        :param python_package: The Python package this object should represent
        :type  python_package: package
        """
        self._package = python_package
        # This is an object representation of the DB object that keeps track of the migration
        # version that has been applied

        try:
            self._migration_tracker = MigrationTracker.objects().get(name=self.name)
        except DoesNotExist:
            self._migration_tracker = MigrationTracker(name=self.name)
            self._migration_tracker.save()

        # Calculate the latest available version
        available_versions = self.available_versions
        if available_versions:
            self.latest_available_version = available_versions[-1]
        else:
            self.latest_available_version = 0

    def apply_migration(self, migration, update_current_version=True):
        """
        Apply the migration that is passed in, and update the DB to note the new version that this
        migration represents.

        :param migration:              The migration to apply
        :type  migration:              pulp.server.db.migrate.utils.MigrationModule
        :param update_current_version: If True, update the package's current version after
                                       successful application and enforce migration version order.
                                       If False, don't enforce and don't update.
        :type  update_current_version: bool
        """
        if update_current_version and migration.version != self.current_version + 1:
            msg = _('Cannot apply migration %(name)s, because the next migration version is '
                    '%(version)s.')
            msg = msg % {'name': migration.name, 'version': self.current_version + 1}
            raise Exception(msg)
        migration.migrate()
        if update_current_version:
            self._migration_tracker.version = migration.version
            self._migration_tracker.save()

    @property
    def available_versions(self):
        """
        Return a list of the migration versions that are available in this migration package.

        :rtype: list
        """
        migrations = self.migrations
        versions = [migration.version for migration in migrations]
        return versions

    @property
    def current_version(self):
        """
        An integer that represents the migration version that the database is currently at.
        None means that the migration package has never been run before.

        :rtype: int
        """
        return self._migration_tracker.version

    @property
    def migrations(self):
        """
        Finds all available migration modules for the MigrationPackage,
        and then sorts by the version. Return a list of MigrationModules.

        :rtype: list
        """
        # Generate a list of the names of the modules found inside this package
        module_names = [name for module_loader, name, ispkg in
                        iter_modules([os.path.dirname(self._package.__file__)])]
        migration_modules = []
        for module_name in module_names:
            try:
                module_name = '%s.%s' % (self.name, module_name)
#.........这里部分代码省略.........