Extract dynamic key from JsonPath

Question

{
"random": {
   "5756cd7a-4662-4428-9b09-dbff3080450a": {
       "@class": "one",
       "id": "5756cd7a-4662-4428-9b09-dbff3080450a"
   },
   "857ef5ee-af98-4f24-89fe-29bdbebde882": {
       "@class": "two",
       "id": "857ef5ee-af98-4f24-89fe-29bdbebde882"
   }
 }
}

This is my api 'response' which is in type JsonPath.

String random = response.getString("random");

I'm stuck after this as to how to extract the first random element.

Answer 1

From looking at the documentation, perhaps you could use JsonPath#getMap to do the extraction, eg:

final Map<String, RandomObject> result = response.getMap("random", String.class, RandomObject.class);

Where RandomObject would be something like:

public class RandomObject {
    private String klass; // N.B. Not sure how to deal with @class naming
    private String id;

    // ... constructor/setters/getters etc...
}

Although, I'm not very familiar with this JsonPath library, so it may not be that easy.

Answer 2

Assuming you have your json response as string in responseJsonString, the code below may solve your problem.

    List<String> randomIDS = JsonPath.read(responseJsonString, "$.random..id");
    Collections.reverse(randomIDS);

    for (String randomID : randomIDS) {
        StringBuilder stringBuilder = new StringBuilder("$.random.");
        String randomClass = JsonPath.read(
                responseJsonString, 
                stringBuilder.append(randomID).append(".@class").toString());
        System.out.println(randomClass);
    }