def filter(self, *args, **kwargs):
"""
Adds WHERE arguments to the queryset, returning a new queryset
See :ref:`retrieving-objects-with-filters`
Returns a QuerySet filtered on the keyword arguments
"""
# add arguments to the where clause filters
if len([x for x in kwargs.values() if x is None]):
raise CQLEngineException("None values on filter are not allowed")
clone = copy.deepcopy(self)
for operator in args:
if not isinstance(operator, WhereClause):
raise QueryException('{0} is not a valid query operator'.format(operator))
clone._where.append(operator)
for arg, val in kwargs.items():
col_name, col_op = self._parse_filter_arg(arg)
quote_field = True
# resolve column and operator
try:
column = self.model._get_column(col_name)
except KeyError:
if col_name == 'pk__token':
if not isinstance(val, Token):
raise QueryException("Virtual column 'pk__token' may only be compared to Token() values")
column = columns._PartitionKeysToken(self.model)
quote_field = False
else:
raise QueryException("Can't resolve column name: '{0}'".format(col_name))
if isinstance(val, Token):
if col_name != 'pk__token':
raise QueryException("Token() values may only be compared to the 'pk__token' virtual column")
partition_columns = column.partition_columns
if len(partition_columns) != len(val.value):
raise QueryException(
'Token() received {0} arguments but model has {1} partition keys'.format(
len(val.value), len(partition_columns)))
val.set_columns(partition_columns)
# get query operator, or use equals if not supplied
operator_class = BaseWhereOperator.get_operator(col_op or 'EQ')
operator = operator_class()
if isinstance(operator, InOperator):
if not isinstance(val, (list, tuple)):
raise QueryException('IN queries must use a list/tuple value')
query_val = [column.to_database(v) for v in val]
elif isinstance(val, BaseQueryFunction):
query_val = val
else:
query_val = column.to_database(val)
clone._where.append(WhereClause(column.db_field_name, operator, query_val, quote_field=quote_field))
return clone
def iff(self, *args, **kwargs):
"""Adds IF statements to queryset"""
if len([x for x in kwargs.values() if x is None]):
raise CQLEngineException("None values on iff are not allowed")
clone = copy.deepcopy(self)
for operator in args:
if not isinstance(operator, TransactionClause):
raise QueryException(
'{} is not a valid query operator'.format(operator))
clone._transaction.append(operator)
for col_name, val in kwargs.items():
exists = False
try:
column = self.model._get_column(col_name)
except KeyError:
if col_name == 'pk__token':
if not isinstance(val, Token):
raise QueryException(
"Virtual column 'pk__token' may only be compared to Token() values"
)
column = columns._PartitionKeysToken(self.model)
else:
raise QueryException(
"Can't resolve column name: '{}'".format(col_name))
if isinstance(val, Token):
if col_name != 'pk__token':
raise QueryException(
"Token() values may only be compared to the 'pk__token' virtual column"
)
partition_columns = column.partition_columns
if len(partition_columns) != len(val.value):
raise QueryException(
'Token() received {} arguments but model has {} partition keys'
.format(len(val.value), len(partition_columns)))
val.set_columns(partition_columns)
if isinstance(val, BaseQueryFunction) or exists is True:
query_val = val
else:
query_val = column.to_database(val)
clone._transaction.append(TransactionClause(col_name, query_val))
return clone
def iff(self, *args, **kwargs):
"""Adds IF statements to queryset"""
if len([x for x in kwargs.values() if x is None]):
raise CQLEngineException("None values on iff are not allowed")
clone = copy.deepcopy(self)
for operator in args:
if not isinstance(operator, TransactionClause):
raise QueryException("{0} is not a valid query operator".format(operator))
clone._transaction.append(operator)
for col_name, val in kwargs.items():
exists = False
try:
column = self.model._get_column(col_name)
except KeyError:
if col_name == "pk__token":
if not isinstance(val, Token):
raise QueryException("Virtual column 'pk__token' may only be compared to Token() values")
column = columns._PartitionKeysToken(self.model)
else:
raise QueryException("Can't resolve column name: '{0}'".format(col_name))
if isinstance(val, Token):
if col_name != "pk__token":
raise QueryException("Token() values may only be compared to the 'pk__token' virtual column")
partition_columns = column.partition_columns
if len(partition_columns) != len(val.value):
raise QueryException(
"Token() received {0} arguments but model has {1} partition keys".format(
len(val.value), len(partition_columns)
)
)
val.set_columns(partition_columns)
if isinstance(val, BaseQueryFunction) or exists is True:
query_val = val
else:
query_val = column.to_database(val)
clone._transaction.append(TransactionClause(col_name, query_val))
return clone