Using Room's @ForeignKey as @Entity parameter in Kotlin
This is the way to provide the annotation you're looking for, with explicit arrays for the arguments, and no @ for the nested annotation's creation:
@Entity(tableName = "Foo", foreignKeys = arrayOf( ForeignKey(entity = Bar::class, parentColumns = arrayOf("someCol"), childColumns = arrayOf("someOtherCol"), onDelete = CASCADE)))Since Kotlin 1.2, you can also use array literals:
@Entity(tableName = "Foo", foreignKeys = [ ForeignKey(entity = Bar::class, parentColumns = ["someCol"], childColumns = ["someOtherCol"], onDelete = CASCADE)])