创建它时无法引用GraphQLObjectType

Question

我试图从json配置动态生成graphql方案。但我无法为自己创建一个GraphQLList。

JSON：

{ 
    "label": "user", 
    "properties": [ 
    { 
     "key": "name", 
     "type": "string" 
    }, 
    { 
     "key": "id", 
     "type": "id" 
    }, 
    { 
     "key": "birthday", 
     "type": "date" 
    }, 
    { 
     "key": "gender", 
     "type": "string" 
    }, 
    { 
     key: 'friends', 
     type: 'string' 
    } 
    ] 
} 

的JavaScript代码生成：

graphSchemes.forEach(function (graphScheme) { 
graphQLObjects[graphScheme.label] = new graphql.GraphQLObjectType({ 
    name: graphScheme.label, 
    fields: graphScheme.properties.reduce((fields, property) => { 
    if (property.key === 'friends') { 
     fields[property.key] = { 
     type: new graphql.GraphQLList(graphQLObjects[graphScheme.label]) 
     }; 
     return fields; 
    } 
    fields[property.key] = { 
     type: TYPES[property.type] 
    }; 
    return fields; 
    }, {}) 
}); 

}）;这里

的问题是：

type: new graphql.GraphQLList(graphQLObjects[graphScheme.label]) 

没有 “graphQLObjects [graphScheme.label]”

我如何去解决这个？有什么建议么？

Answer 1

字段可能通过将字段放入包装函数中来引用类型本身。

一个例子：

var routeType = new GraphQLObjectType({ 
    name: 'MessageRoute', 
    fields: function() { 
    return { 
     name: { 
     type: GraphQLString 
     }, 
     routes: { 
     type: new GraphQLList(routeType), 
     resolve: (route) => { 
      return route.routes; 
     } 
     } 
    }; 
    } 
});