I need to delete a list of subroutines with one button push. But when I wrote in dao

@Delete(entity = Subroutines.class)
    void deleteSubroutineList(List<Subroutines> subroutine);

I keep getting errors trying to setup up the repository for AsychTask

public void deleteSubroutineList(List<Subroutines> subroutines) {
    new DeleteSubroutineListAsyncTask(habitWithSubroutinesDao).execute(subroutines);
}

public static class DeleteSubroutineListAsyncTask extends AsyncTask<List<Subroutines>, Void, Void> {

    private final HabitWithSubroutinesDao habitWithSubroutinesDao;

    public DeleteSubroutineListAsyncTask(HabitWithSubroutinesDao habitWithSubroutinesDao) {
        this.habitWithSubroutinesDao = habitWithSubroutinesDao;
    }

    @Override
    protected Void doInBackground(List<Subroutines>... lists) {
        habitWithSubroutinesDao.deleteSubroutineList(lists);
        return null;
    }
}

Required type: List,

Provided: List<Subroutines>[]

But when I update required type on dao into

@Delete(entity = Subroutines.class)
void deleteSubroutineList(List<Subroutines>[] subroutine);

I get error at compile: pointing on dao

error: The partial entity java.util.List<E> does not have any columns that can be used to perform the query.
    void deleteSubroutineList(List<Subroutines>[] subroutine);

The Subroutine Entity Class:

@Entity(foreignKeys = @ForeignKey(
                entity = Habits.class,
                parentColumns = "pk_habit_uid",
                childColumns = "fk_habit_uid",
                onDelete = ForeignKey.CASCADE,
                onUpdate = ForeignKey.CASCADE
        ))
public class Subroutines implements Serializable {
    @PrimaryKey(autoGenerate = true)
    @ColumnInfo(name = "pk_subroutine_uid")
    private long pk_subroutine_uid;

    @ColumnInfo(name = "fk_habit_uid", index = true)
    private long fk_habit_uid;

    @ColumnInfo(name = "routine")
    private String subroutine;

    @ColumnInfo(name = "description")
    private String description;

    @ColumnInfo(name = "color")
    private String color;

    @ColumnInfo(name = "isModifiable")
    private Boolean isModifiable;

    @ColumnInfo(name = "isMarkedDone")
    private boolean is_marked_done;

    @ColumnInfo(name = "streak")
    private int streak;

    @ColumnInfo(name = "total_streak")
    private int total_streak;

    @ColumnInfo(name = "skips")
    private int skips;

*not include getter and setters, constructor, toString cause to long

What should I do to make this work?

CodePudding user response：

I believe that you could utilise:-

@Delete(entity = Subroutines.class)
void deleteSubroutineList(List<Subroutines> subroutine);

In conjunction with :-

    @Override
    protected Void doInBackground(List<Subroutines>... lists) {
        for(List<Subroutines> ls: lists)
        habitWithSubroutinesDao.deleteSubroutineList(ls);
        return null;
    }