andresc-dev
commented
8 months ago Follow up
I was finally able to make it work. The issue was related to the isolate having no plugins registered at all (ie: sqflite)
The solution is to add
WorkmanagerPlugin.setPluginRegistrantCallback { registry in GeneratedPluginRegistrant.register(with: registry) }
on ios/Runner/AppDelegate.swift file.
See this as an example. It was also documented here
Hope this writing helps others!
I developed an app in Flutter using workmanager plugin and the DB service uses Floor, a layer on top of sqflite. It does CRUD operations on main isolate and has a background job every 30 minutes to sync the db against a cloud service in the workmanager isolate.
It works well on Android. On Android I simply do
final db = await $FloorAppDatabase.databaseBuilder('database.db').build();Same sentence in iOS fails with
MissingPluginException(No implementation found for method getDatabasesPath on channel com.tekartik.sqflite)Which is a flutter interface calling a not found native method in theabstract class DatabaseFactory(filesqlite_api.dart)Reading issues and stackoverflow posts, I finally found the work @alextekartik did on this branch but unfortunately the code is more complex than needed to show the steps to properly get the DB opened on the workmanager isolate. I was not able to fully understand the magic to make it work.
I read about the non-thread safety of opening the DB on another isolate. I need read only access, then write a boolean field indicating upload ok on cloud server.
Hope someone can point me out with a workaround. If not I need to rewrite the database service using another isolate aware framework.
Thanks much
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