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.
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我创建了一个互动旅行指南，以帮助人们旅行 像我这样的。用于 unforgettable 旅行