How to fix "flutter: DatabaseException(open_failed...)"? - ios

Question

I'm trying to run my flutter app on my iPhone 7 but I'm receiving an error message. Running the app on my Android phone as well as on the iPhone XR simulator works fine.
I also tried to test the app on my iPad and I got the exact same error message as shown below. Replacing the ios folder with a fresh copy did not solve the issue.
I've tried to run the latest sqflite version and flutter doctor shows no issues.
Future<Database> initDatabase() async {
//Get the dir
Directory directory = await getApplicationDocumentsDirectory();
String path = directory.path + 'posts.db';
//Open or Create the database using given path
var postsDataBase = openDatabase(path, version: 1, onCreate: _createDb);
return postsDataBase;
}
[VERBOSE-2:ui_dart_state.cc(148)] Unhandled Exception: DatabaseException(open_failed /var/mobile/Containers/Data/Application/04C0A23F-6C36-42C2-9CE5-C7C5370F59FA/Documentsposts.db)
#0 wrapDatabaseException
package:sqflite/src/exception_impl.dart:11
<asynchronous suspension>
#1 SqfliteDatabaseFactoryImpl.wrapDatabaseException
package:sqflite/src/factory_impl.dart:29
#2 SqfliteDatabaseMixin.safeInvokeMethod
package:sqflite/src/database_mixin.dart:184
#3 SqfliteDatabaseMixin.openDatabase
package:sqflite/src/database_mixin.dart:519
<asynchronous suspension>
#4 SqfliteDatabaseMixin.doOpen
package:sqflite/src/database_mixin.dart:612
<asynchronous suspension>
#5 SqfliteDatabaseOpenHelper.openDatabase
package:sqflite/src/database.dart:32
<asynchronous suspension>
#6 SqfliteDatabaseFactoryMixin.openDatabase.<anonymous closure>
package:sqflite/src/factory_mixin.dart:100
<asynchronous suspension>
#7 ReentrantLock.synchronized.<anonymous closure>.<anonymous closure>
package:synchronized/src/reentrant_lock.dart:33
#8 _rootRun (dart:async/zone.dart:1124:13)

Answer 1

Check whether the parent directory exists or not and try using the latest sqlite version.

Answer 2

This worked for me.
String path = directory.path + '/' + 'posts.db';

Answer 3

As you can see in the logs, the path you build ends with /Documentsposts.db where I think you likely want /Documents/posts.db
Don't use the plus sign to build a path but use join from the package path.
i.e. instead of:
String path = directory.path + 'posts.db';
do
var path = join(directory.path, 'posts.db');
On iOS you should also make sure the parent directory exists first.