Room DB 将 String @PrimaryKey 视为 @Embedded

Question

I am getting errors similar to below when I try to compile my project...

error: Cannot find a column in the entity com.example.BooleanEntity that matches with this partial entity field. If you don't wish to use the field then you can annotate it with @Ignore. - coder in java.lang.String
error: Cannot find a column in the entity com.example.BooleanEntity that matches with this partial entity field. If you don't wish to use the field then you can annotate it with @Ignore. - hash in java.lang.String

the super weird part is at the end of the error messages:

....with @Ignore. - coder in java.lang.String
....with @Ignore. - hash in java.lang.String

it is trying to access properties inside the String class??

my @Entity declaration is as follows

@Entity
data class BooleanEntity(
    @PrimaryKey val id:String,
    val value:Boolean,
)

BooleanDao class...if i comment out the @Delete and delete , then error stops appearing

@Dao
interface BooleanDao
{
    @Delete(entity = BooleanEntity::class)
    suspend fun delete(id:String)
}

inside build.gradle file

dependencies {
    .....
    // room database
    implementation "androidx.room:room-ktx:2.4.2"
    kapt "androidx.room:room-compiler:2.4.2"
    .....
}

Answer 1

i implemented the @Delete function wrong.

according to @Delete JavaDoc, the parameters should either be an @Entity or a partial entity:

• All of the parameters of the Delete method must either be classes annotated with {@link Entity} or collections/array of it.

   @Dao public interface MusicDao { @Delete public void deleteSongs(Song... songs); @Delete public void deleteAlbumAndSongs(Album album, List<Song> songs); }

• If the target entity is specified via {@link #entity()} then the parameters can be of arbitrary POJO types that will be interpreted as partial entities. For example:

   @Entity public class Playlist { @PrimaryKey long playlistId; long ownerId; String name; @ColumnInfo(defaultValue = "normal") String category; } public class OwnerIdAndCategory { long ownerId; String category; } @Dao public interface PlaylistDao { @Delete(entity = Playlist.class) public void deleteByOwnerIdAndCategory(OwnerIdAndCategory... idCategory); }

since the argument i passed in is not annotated with @Entity , then it was being interpreted as a partial entity....so it was looking for the fields from String inside my BooleanEntity class...