打字稿：在类型“{}”上找不到带有“字符串”类型参数的索引签名

Question

So I have the following object:

{"1": {"name": "spencer", "number": "965756"}}, {"2": {"name": "mary", "number": "5346"}},  {"3": {"name": "john", "number": "1234"}}

This object is the result of a database query and I would like to convert this object into an array, using the array.push() method. This gives the error:

error TS7053: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{}'.
  No index signature with a parameter of type 'string' was found on type '{}'.

I was so sure that the error occurs, because '{}' would be the empty object in case the database query failed. So I did a check if the result object ( plainObjectResult ) was empty before converting it into an array. But the error stays and I don't have any idea why.

Here is the code:

export interface Person {
  name: string;
  number: string;
}

export interface PersonResults {
  [key: string]: Person;
}

// make the Realm database Result Object a plain "normal" object
const plainObjectResult: object = realmToPlainObject(queryResult);

const resultArray: PersonResults[] = [];

if (Object.keys(plainObjectResult).length > 0) {
  for (let person in plainObjectResult) {
    // person: 0, 1, 2, ...
    // plainObjectResult[person]: {"name": "spencer", "number": "965756"}
    resultArray.push({[person]: plainObjectResult[person]}); // above error occurs for "plainObjectResult[person]"
  }
}    

Can someone please help me?

Answer 1

This is INVALID {"1": {"name": "spencer", "number": "965756"}}, {"2": {"name": "mary", "number": "5346"}}, {"3": {"name": "john", "number": "1234"}}

It should have been { "1": { "name": "spencer", "number": "965756" }, "2": { "name": "mary", "number": "5346" }, "3": { "name": "john", "number": "1234" } }

Try this

export interface Person {
  name: string;
  number: string;
}

export interface PersonResults {
  [key: string]: Person;
}

// make the Realm database Result Object a plain "normal" object
let plainObjectResult: any = { "1": { "name": "spencer", "number": "965756" }, "2": { "name": "mary", "number": "5346" }, "3": { "name": "john", "number": "1234" } };

const resultArray: PersonResults[] = [];

if (Object.keys(plainObjectResult).length > 0) {
  for (let person in plainObjectResult) {
    let id = '' + person;
    let obj:PersonResults  = {};
    obj[id] = plainObjectResult[person];
    resultArray.push(obj); // above error occurs for "plainObjectResult[person]"
  }
}

console.log('resultArray: ', resultArray)