CODEWITHSUNDEEP
javaandroidgsonretrofit
Drago
Drago

Reputation: 1875

Data model for nested object in Retrofit/GSON

I'm using a remote weather API and got the following data from it. I'm making calls with Retrofit and I use GSON.

{"coord":{"lon":127.08,"lat":37.51},"weather":[{"id":701,"main":"Mist","description":"mist","icon":"50n"},
{"id":721,"main":"Haze","description":"haze","icon":"50n"}],"base":"stations",
"main":{"temp":18,"pressure":1013,"humidity":82,"temp_min":17,"temp_max":19},
"visibility":9000,"wind":{"speed":1.5,"deg":160},"clouds":{"all":40},"dt":1559762819,
"sys":{"type":1,"id":8096,"message":0.0054,"country":"KR","sunrise":1559765465,
"sunset":1559818179},"timezone":32400,"id":1837217,"name":"Sinch’ŏn-dong","cod":200}

I have a single data model named Weather. If I want my data model to also support wind do I have to create a separate data model for it because it's nested in the JSON response which I showed above?

Upvotes: 0

Views: 1313

Answers (3)

pirho
pirho

Reputation: 12215

The response you get is an object that holds both Weather and Wind let us call it WeatherResponse. Simplified JSON is like:

{
  "weather": [
    {
      "id": 701,
      "main": "Mist",
      "description": "mist",
      "icon": "50n"
    },
    {
      "id": 721,
      "main": "Haze",
      "description": "haze",
      "icon": "50n"
    }
  ],
  "wind": {
    "speed": 1.5,
    "deg": 160
  }
}

You might have something like this in your Retrofit API:

@GET("weather")
Call<WeatherResponse> getWeather();

where WeatherResponse looks like:

public class WeatherResponse {
    public Collection<Weather> weather;
    public Wind wind; // You need to add & implement this!
}

If you already can parse your Weather it should look like:

public class Weather {
    public Long id;
    public String main;
    public String description;
    public String icon;
}

and you need to implement the class Wind like:

public class Wind {
    public Double speed;
    public Integer deg;

}

(I have declared all the fields public just to shorten the code so omitting getters & setters.)

Upvotes: 1

joseph.dev89
joseph.dev89

Reputation: 21

yes, you have to create a new data model. And be careful with handling possible null vales. Here is a kotlin example And, personally. I prefer to do the model manually instead of using a tool, by doing it by yourself you can realize of many things, like naming, possible null values and not needed data

import com.google.gson.annotations.SerializedName

data class AdReplyRequest(@SerializedName("cc_sender") val cc_sender: Boolean,
                          @SerializedName("message") val message: AdReplyMessage)

data class AdReplyMessage(@SerializedName("body") val message: String,
                          @SerializedName("email") val email: String,
                          @SerializedName("name") val name: String,
                          @SerializedName("phone") val phone: String)

Upvotes: 0

Jasurbek
Jasurbek

Reputation: 2966

Actually you can do this by creating one model class for each object and place them as a variable in outer class. However, it is time consuming

Suggestions

  1. Search internet json to java/kotlin they will convert for you
  2. Android Studio has many plugins to do same job. Just install one with higher starred then, this plugins will take care of creating your pojo class from given json input

Upvotes: 0

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