Make CaldavTask.task immutable

app/src/androidTest/java/org/tasks/data/GoogleTaskDaoTests.kt

@@ -257,8 +257,11 @@ class GoogleTaskDaoTests : InjectingTestCase() {
     private suspend fun insert(googleTask: CaldavTask, top: Boolean = false) {
         val task = newTask()
         taskDao.createNew(task)
-        googleTask.task = task.id
-        googleTaskDao.insertAndShift(task, googleTask, top)
+        googleTaskDao.insertAndShift(
+            task,
+            googleTask.copy(task = task.id),
+            top
+        )
     }
 
     private suspend fun getByRemoteId(remoteId: String): CaldavTask {

app/src/main/java/org/tasks/backup/TasksJsonImporter.kt

@@ -262,8 +262,7 @@ class TasksJsonImporter @Inject constructor(
                     }
                     ?.let { taskAttachmentDao.insert(it) }
                 backup.caldavTasks?.forEach { caldavTask ->
-                    caldavTask.task = taskId
-                    caldavDao.insert(caldavTask)
+                    caldavDao.insert(caldavTask.copy(task = taskId))
                 }
                 backup.vtodo?.let {
                     val caldavTask =

app/src/main/java/org/tasks/caldav/iCalendar.kt

@@ -199,13 +199,16 @@ class iCalendar @Inject constructor(
         obj: String? = null,
         eTag: String? = null
     ) {
-        val task = existing?.task?.let { taskDao.fetch(it) }
+        val task = existing?.task
+            ?.let { taskDao.fetch(it) }
             ?: taskCreator.createWithValues("").apply {
                 readOnly = calendar.access == ACCESS_READ_ONLY
                 taskDao.createNew(this)
-                    existing?.task = id
             }
-        val caldavTask = existing ?: CaldavTask(
+        val caldavTask =
+            existing
+                ?.copy(task = task.id)
+                ?: CaldavTask(
                     task = task.id,
                     calendar = calendar.uuid,
                     remoteId = remote.uid,

app/src/main/java/org/tasks/data/CaldavTask.kt

@@ -26,7 +26,7 @@ data class CaldavTask(
     val id: Long = 0,
     @ColumnInfo(name = "cd_task", index = true)
     @Transient
-    var task: Long,
+    val task: Long,
     @ColumnInfo(name = "cd_calendar")
     var calendar: String?,
     @ColumnInfo(name = "cd_remote_id")

app/src/main/java/org/tasks/gtasks/GoogleTaskSynchronizer.kt

@@ -377,12 +377,17 @@ class GoogleTaskSynchronizer @Inject constructor(
             alarmDao.insert(task.getDefaultAlarms())
         }
         taskDao.save(task)
-        googleTask.lastSync = task.modificationDate
-        googleTask.task = task.id
-        if (googleTask.id == 0L) {
-            googleTaskDao.insert(googleTask)
+        googleTask
+            .copy(
+                task = task.id,
+                lastSync = task.modificationDate,
+            )
+            .let {
+                if (it.id == 0L) {
+                    googleTaskDao.insert(it)
                 } else {
-            googleTaskDao.update(googleTask)
+                    googleTaskDao.update(it)
+                }
             }
     }