How to get the array of elements using Retrofit?

Question

I need to get a list of orders through Rest API. The JSON from the server looks as follows:

{
    "meta":
    {
        "status": "SUCCESS",
        "message": "Data was fetched successfully."
    },
    "data":
    {
        "orders":
        [
            {
                "id": "1",
                "seller": "some value"
            },
            {
                "id": "2",
                "seller": "some value"
            }
        ]
    }
}

I use ORMLite, and the model looks like this:

@DatabaseTable(tableName = Order.TABLE_NAME)
public class Order {

    public static final String TABLE_NAME = "Order";

    @DatabaseField
    private String id;

    @DatabaseField
    private String seler;

    public Order() {
    }

    // getters and setters
}

Retrofit 2 is used to perform queries:

@GET("/api/orders/get")
Call<RestResponse<List<Order>>> getOrdersList();

And, finally, RestResponse class is as follows:

public class RestResponse<T> {
    private Meta meta;
    private T data;

    public RestResponse() {
        meta = new Meta();
    }

    public Meta getMeta() {
        return meta;
    }

    public T getData() {
        return data;
    }

    public static class Meta {
        private Status status;
        private String message;

        // getters and setters
    }
}

When performing this query, I get the following error:

Expected BEGIN_ARRAY but was BEGIN_OBJECT

The error's reason is clear: callback intends to obtain the object, but gets the array. What can be done in this situation if I want to get an array of elements with <Order> type?

Thanks!

Answer 1

Field data

public class RestResponse<T> {
    private Meta meta;
    private T data;
    ...
}

Must be object, not list.

Add Orders class:

public class Orders {
    List<Order> orders;
    ...
}

And modify retrofit call:

Call<RestResponse<Orders>> getOrdersList();