示例#1
0
    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
示例#2
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    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
示例#3
0
    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