Entity class must be annotated with @Entity

Question

I'm having issues creating @Relation. I previously was using a complicated query to handle M:N, but I wanted to try the simpler @Relation and rely on ids. However, I get an error whenever I extend or embed the @Relation class. This works:

@Entity(tableName = "meta",
foreignKeys = [ForeignKey(
    entity = FolderEntity::class,
    parentColumns = ["id"],
    childColumns = ["parentId"],
    onDelete = CASCADE)],
indices = [
    Index(value = ["uri"], unique = true),
    Index(value = ["documentId"], unique = true),
    Index(value = ["parentId"])])
open class MetadataEntity {
@PrimaryKey(autoGenerate = true)
    var id: Long = 0
    ...
}

@TypeConverters(MetadataResult::class)
class MetadataResult : MetadataEntity() {
   var keywords: List<String>? = null
   var parentUri: String? = null

   @TypeConverter
   fun fromGroupConcat(keywords: String?): List<String>? = keywords?.split(",")
}

However, this does not work:

data class MetadataXmp(
   @Embedded
   val metadata:MetadataEntity,
   @Relation(
        parentColumn = "id",
        entityColumn = "metaId",
        projection = ["subjectId"],
        entity = SubjectJunction::class)
   var subjectIds: List<Long> = Collections.emptyList(),

   @Relation(
        parentColumn = "parentId",
        entityColumn = "id",
        projection = ["documentUri"],
        entity = FolderEntity::class)
   var parentUris: List<String> = Collections.emptyList())

Please note that the varying object type (class, data class, etc) is just the state of disarray of my attempts. I have tried various versions of extension with MetadataXmp or embedding, abstract, data class, etc. I don't seem to be able to introduce @Relation.

Aniruddha K.M · Accepted Answer · 2019-05-03 11:50:00Z

4

I was facing a similar Error message, for me the issue was that I had not declared the enity in the Database class but I had Annotated the pojo, Posting answer as it might help somebody with similar problem.

answered May 3, 2019 at 11:50

Aniruddha K.M

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1 Comment

Tonnie Over a year ago

saved me bro, thanks lots. I had encluded the wrong entity class on the entities array

Anthony · Accepted Answer · 2018-03-07 02:25:25Z

1

The error is actually related to @RawQuery:observedEntities. I was observing the result POJO instead of the underlying @Entity. The error message simply points to the POJO which is misleading. Google is looking at improving the error message.

answered Mar 7, 2018 at 2:25

Anthony

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Mahendhar · Accepted Answer · 2021-08-16 05:12:08Z

0

I was facing the same issue while implementing the room DB in our application. but in my case room DB version is 2.2.6 when I increase to the latest version 2.3.0 solved my issue.

answered Aug 16, 2021 at 5:12

Mahendhar

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