Retrofit, how to parse JSON objects with variable keys

Question

First I know my title is bad as I didn't come up with better, I'm opened to suggestion.

I'm using retrofit to get data from an api of this kind : @GET("users/{userid}")

It works fine and I'm happy with it, the problem is when I call the same api with @POST("users/widget") with a list of ids. I have the following answer :

{
  "long_hash_id": {
    "_id": "long_hash_id"
    .......
  },
  "long_hash_id": {
    "_id": "long_hash_id",
    .....
  },
  ........
}

the "long_hash_id" is typicaly "525558cf8ecd651095af7954" it correspond to the id of the user attached to it.

When I didn't use retrofit, I used Gson in stream mode to get each user one by one. But I don't know how to tell retrofit.

Hope I'm clear and Thank you in advance.

----------- Solution :

I made my interface this way :

@FormUrlEncoded
@POST(AppConstants.ROUTE_USER_GROUP)
Call<Map<String,User>> getUsers( @Field("ids") List<String> param, @QueryMap Map<String,String> options);

and I simply gave my ArrayList of ids. Thank you very much

yes I want to parse it with retrofit, for now I don't use retrofit. — Renaud Favier
– Renaud Favier, Commented Nov 12, 2015 at 15:08

Blackbelt · Accepted Answer · 2015-11-12 14:54:57Z

7

Gson is able to deal with JSON objects with variable keys like the one you posted. What you have to do, in this case, is to declare a Map<String, ModelClass>, where ModelClass is the content of the JSONObject you want to represent

answered Nov 12, 2015 at 14:54

Blackbelt

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5 Comments

Renaud Favier Over a year ago

Thank you ! I declare it to who ? I create a new Model containing juste this map ? maybe you have a link or key words for me to find it ?

Blackbelt Over a year ago

post the code you are using. Your Retrofit interface declaration, and the Model class. I'll try to guide you trough that

Renaud Favier Over a year ago

ok I did it, "jsonObjectToUrlEncodedString" take in this case the json array and convert it to urlencoded,

Renaud Favier Over a year ago

for now I use generics because it's a method used for a lot of routes that works the same way

Renaud Favier Over a year ago

Ok, thank you very much it worked. I update my title and my question

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