Room Persistence: Error:Entities and Pojos must have a usable public constructor

Question

I\'m converting a project to Kotlin and I\'m trying to make my model (which is also my entity) a data class I intend to use Moshi to convert the JSON responses from the API<

Answer 1

As stated in Room Database Entity:

Each entity must either have a no-arg constructor or a constructor whose parameters match fields (based on type and name).

So adding an empty constructor and annotating your parameterized constructor with @Ignore will solve your problem. An example:

public class POJO {

    long id;

    String firstName;

    @Ignore
    String lastName;

    public POJO() {
    }

    @Ignore
    public POJO(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    // getters and setters
    // ...

}