Abstract type "TravelTips" must resolve to an Object type at runtime for field "Query.travelTipBySlug". Either the "TravelTips" type should provide a "resolveType" function or each possible type should provide an "isTypeOf" function.
Embedded in the high oak beams of Casa Isolani's ancient wooden portico are three mysterious arrows. According to legend, they were fired by three would-be assassins who were distracted at the crucial moment. These stray arrows have been stuck there for centuries, turning a simple walk down Strada Maggiore into a quirky treasure hunt.