def allOnlyFields(self, fields, cascadeFetch=False):
matchedKeys = self.getPrimaryKeys()<EOL>if matchedKeys:<EOL><INDENT>return self.getMultipleOnlyFields(matchedKeys, fields, cascadeFetch=cascadeFetch)<EOL><DEDENT>return IRQueryableList([], mdl=self.mdl)<EOL>
allOnlyFields - Get the objects which match the filter criteria, only fetching given fields.

@param fields - List of fields to fetch

@param cascadeFetch <bool> Default False, If True, all Foreign objects associated with this model
   will be fetched immediately. If False, foreign objects will be fetched on-access.


@return - Partial objects with only the given fields fetched