GraphQL查询嵌套数据

Question

我正在学习graphql，在这里我向API发出请求，该API以以下格式返回数据： 我想读：a，c，h和j，但我卡在入口点

{
   "records":[
      {
        "a":"1",
         "b":"2",
         "c":['d','e'],
         "f":
            [{'g':5,'h':7},
            {'i':8,'j':[1,2,3,4]}]},
      
      {},
      {}
     ]
     
}

const recordType = new GraphQLObjectType({
    name: "records",
    fields: () => ({
        a: { type: GraphQLString },
        url: { type: GraphQLString },
        c:{ type: GraphQLList },
        f: {type:getFtype}
    })
  });

const getFtype = new GraphQLList({
    name: "Ftype",
    fields: () => ({
        //How to handle here ?
    })
  });
  
  
  const RootQuery = new GraphQLObjectType({
    name: "RootQueryType",
    fields: {
        records: {
        type: new GraphQLList(recordType),
        resolve(parent, args) {
            return axios.get('https:/abcd?type='pagewise')
            .then(res =>res.data)
        }
      }
    }
  });

我感到迷茫，数据是如此嵌套，仅获取a和b也会引发错误：

Expected Iterable, but did not find one for field 

有人可以帮我吗？