i'm trying to add new attributes to my tables as shown here:
@Entity(
tableName = "invoices", indices = [Index(value = [...], unique = true)]
)
data class Invoice(
...
override val created_at: Long = 0,
override var approved_at: Long? = 0,
) : ICD
so i created the following migration:
val MIGRATION_3_4 = object: Migration(3, 4) {
override fun migrate(database: SupportSQLiteDatabase) {
database.execSQL("ALTER TABLE invoices ADD COLUMN created_at INTEGER NOT NULL DEFAULT 0")
database.execSQL("ALTER TABLE invoices ADD COLUMN approved_at INTEGER DEFAULT 0 ")
}
}
but whenever i try to run it says the migration wasnt handled properly and shows this as expected:
TableInfo{name='invoices', columns={... ,created_at=Column{name='created_at', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, approved_at=Column{name='approved_at', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0, defaultValue='null'}}, ... }
and this as whats found:
TableInfo{name='invoices', columns={... ,created_at=Column{name='created_at', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='0'}, approved_at=Column{name='approved_at', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0, defaultValue='0'}}, ... }
can anyone tell me why is it expecting default value null please?
What I believe is, you are using Room version greater than 2.2.0, and version 2.2.0 and above needs default values of the columns to be defined in their respective entity class using @ColumnInfo(defaultValue="0")
For your case add @ColumnInfo(defaultValue="0") to created_at and approved_at
@ColumnInfo(defaultValue="0")
override val created_at: Long = 0,
@ColumnInfo(defaultValue="0")
override var approved_at: Long? = 0,
And change your migration function to this
database.execSQL("ALTER TABLE invoices ADD COLUMN created_at INTEGER NOT NULL DEFAULT 0")
database.execSQL("ALTER TABLE invoices ADD COLUMN approved_at INTEGER")
If you're using a Room version 2.4.0-alpha01 and higher, you can use autoMigration.
For autoMigration, add autoMigrations annotation to your database
@Database(
entities = [.., .., ..],
version = 2,
autoMigrations = [AutoMigration(from = 1, to = 2)]
)
abastract class Database: RoomDatabase