Android Room: Efficient way to transform json result into db object

Question

Problem

I have a POJO parsed from an API call which looks like this

public class Article {

  public Long id;

  @Expose
  @Serialized         


        

Answer 1

All you have to do is use @Embedded annotation for your POJO(Model Class) which will refer to another class. then create a type converter class.

 @Embedded(prefix = "media")
private Meida media;

@TypeConverters({TypeConvertorClass.class})
@Database(entities = {Article .class,Media.class}, version = 1, exportSchema = false)
public abstract class `DataBaseExample` extends RoomDatabase {
}


public class Converters {
    @TypeConverter
    public static ArrayList fromString(String value) {
        Type listType = new TypeToken>() {}.getType();
        return new Gson().fromJson(value, listType);
    }

    @TypeConverter
    public static String fromArrayLisr(ArrayList list) {
        Gson gson = new Gson();
        String json = gson.toJson(list);
        return json;
    }
}


    public class TypeConvertorClass {
    @TypeConverter
    public static Media getMedia(String longId) {
        return longId== null ? null : new Meida();
    }

}
  @Entity(tableName = "Article")
    public class Article {
        @ColumnInfo (name = "article_id")
        public Long id;

        @Expose
    @SerializedName("section")
    public String section;

    @Expose
    @SerializedName("title")
    public String title;

    @Expose
    @SerializedName("topics")
    public List topics;

   @Embedded(prefix = "media") // We need relation to Media table
    @Expose
    @SerializedName("media")
    public List media;
}

public class Media {
    @ColumnInfo (name = "media_id")
    public Long id;
}