def test_from_db(self):
self.assertIsNone(model_util.from_db(None))
_tor = db_model.Torrent()
_tor['name'] = 'fake.torrent'
_pub_tor = model_util.from_db(_tor)
self.assertIsInstance(_pub_tor, api_model.Torrent)
_mf = db_model.MediaFile()
_mf['filename'] = 'media.mp4'
_mf['file_ext'] = '.mp4'
_mf['torrent_id'] = _tor.id
_pub_mf = model_util.from_db(_mf)
self.assertIsInstance(_pub_mf, api_model.MediaFile)
def fetch(self, entity_type, pk):
"""Fetch the instance using primary key from the database.
:param entity_type: the model type
:param pk: primary key value
"""
_model = getattr(db_model, entity_type.__name__)
session = self._engine_facade.session
with session.begin():
_row = session.query(_model).get(pk)
return model_util.from_db(_row)
def bulk_create(self, instances):
"""Save the instances in bulk to the database.
:param list instances: a list of instance of modeled data object
"""
if not instances:
return
_instances = [model_util.to_db(item) for item in instances]
session = self._engine_facade.session
with session.begin():
session.add_all(_instances)
for _row in _instances:
yield model_util.from_db(_row)
def fetch_by(self, entity_type, qfilter):
"""Fetch the instance(s) based on filter from the database.
:param entity_type: the model type
:param qfilter: query filter to determine which rows to update
"""
_model = getattr(db_model, entity_type.__name__)
session = self._engine_facade.session
with session.begin():
transformer = db_model.QueryTransformer(_model,
session.query(_model))
_query = transformer.apply_filter(qfilter)
for _row in _query.all():
yield model_util.from_db(_row)
def save(self, instance):
"""Save the instance to the database
:param instance: an instance of modeled data object
"""
_model = getattr(db_model, instance.__class__.__name__)
session = self._engine_facade.session
with session.begin():
_pk = getattr(instance, instance.PK_NAME)
if _pk is not None:
_row = session.query(_model).get(_pk)
_row = model_util.to_db(instance, _row)
else:
_row = model_util.to_db(instance)
session.add(_row)
_row.save(session)
return model_util.from_db(_row)
