Source code for camelot.core.orm

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"""Helper functions related to the connection between the SQLAlchemy
ORM and the Camelot Views.
"""

import logging
logger = logging.getLogger('camelot.core.orm')

[docs]def refresh_session(session): """Session refresh expires all objects in the current session and sends a local entity update signal via the remote_signals mechanism this method ought to be called in the model thread. """ from camelot.view.remote_signals import get_signal_handler import sqlalchemy.exc as sa_exc logger.debug('session refresh requested') signal_handler = get_signal_handler() refreshed_objects = [] expunged_objects = [] for _key, obj in session.identity_map.items(): try: session.refresh( obj ) refreshed_objects.append( obj ) except sa_exc.InvalidRequestError: # # this object could not be refreshed, it was probably deleted # outside the scope of this session, so assume it is deleted # from the application its point of view # session.expunge( obj ) expunged_objects.append( obj ) for obj in refreshed_objects: signal_handler.sendEntityUpdate( None, obj ) for obj in expunged_objects: signal_handler.sendEntityDelete( None, obj ) return refreshed_objects

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