helios/helios-alarm-clock
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fix: correct Room migration - use DEFAULT '' to match entity schema

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Migration 1→2 had DEFAULT NULL but @ColumnInfo(defaultValue="") expects
DEFAULT ''. Room schema validation failed on startup.

Since SQLite can't alter column defaults, add migration 2→3 that recreates
the alarms table with the correct DEFAULT '' for the date column.
This commit is contained in:
Helios 2026-02-24 16:01:07 +01:00
parent c78cb8a77d
commit f498ecdef4
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2 changed files with 28 additions and 3 deletions
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29
app/src/main/java/com/example/helios_alarm_clock/data/AlarmDatabase.kt
View file

@ -5,16 +5,41 @@ import androidx.room.RoomDatabase
import androidx.room.migration.Migration
import androidx.sqlite.db.SupportSQLiteDatabase
@Database(entities = [AlarmEntity::class], version = 2, exportSchema = true)
@Database(entities = [AlarmEntity::class], version = 3, exportSchema = true)
abstract class AlarmDatabase : RoomDatabase() {
abstract fun alarmDao(): AlarmDao
companion object {
const val NAME = "helios_alarms.db"
// Fresh install path: add date column with correct default
val MIGRATION_1_2 = object : Migration(1, 2) {
override fun migrate(db: SupportSQLiteDatabase) {
db.execSQL("ALTER TABLE alarms ADD COLUMN date TEXT DEFAULT NULL")
db.execSQL("ALTER TABLE alarms ADD COLUMN date TEXT DEFAULT ''")
}
}
// Fix path: first install had DEFAULT NULL instead of DEFAULT ''
// SQLite can't alter column defaults, so recreate the table
val MIGRATION_2_3 = object : Migration(2, 3) {
override fun migrate(db: SupportSQLiteDatabase) {
db.execSQL("""
CREATE TABLE alarms_new (
id TEXT NOT NULL PRIMARY KEY,
hour INTEGER NOT NULL,
minute INTEGER NOT NULL,
label TEXT NOT NULL,
triggerTimeMillis INTEGER NOT NULL,
date TEXT DEFAULT ''
)
""".trimIndent())
db.execSQL("""
INSERT INTO alarms_new (id, hour, minute, label, triggerTimeMillis, date)
SELECT id, hour, minute, label, triggerTimeMillis, COALESCE(date, '')
FROM alarms
""".trimIndent())
db.execSQL("DROP TABLE alarms")
db.execSQL("ALTER TABLE alarms_new RENAME TO alarms")
}
}
}

2
app/src/main/java/com/example/helios_alarm_clock/di/AppModule.kt
View file

@ -23,7 +23,7 @@ object AppModule {
AlarmDatabase::class.java,
AlarmDatabase.NAME
)
.addMigrations(AlarmDatabase.MIGRATION_1_2)
.addMigrations(AlarmDatabase.MIGRATION_1_2, AlarmDatabase.MIGRATION_2_3)
.build()
@Provides