Implement the offline-first strategy and real-time capability in the Todo App

[JvnSlv]

ACs

• [x] Create a REST API for Todo App
• [x] Connect Todo App with the REST API using the retrofit client
• [x] Using the Repository approach create a solution for storing data locally when the device is not connected to the internet
• [x] The same business models should be used for local storage with Realm and API communication
  Note: Either EJSON or JsonSerializable needs to be used for data serialisation
• [x] Real-time (FlexibleSync) communication should be integrated

[DDavidPrime]

@JvnSlv

While trying to launch the Todo app I got the following error (easily solvable by upgrading the version in Podfile):

[!] CocoaPods could not find compatible versions for pod "firebase_core":
  In Podfile:
    firebase_core (from `.symlinks/plugins/firebase_core/ios`)

Specs satisfying the `firebase_core (from `.symlinks/plugins/firebase_core/ios`)` dependency were found, but they required a higher minimum deployment target.

---

The app launches successfully afterwards but on iOS when I press on the FAB an error is logged:

Error message

``` ======== Exception caught by scheduler library ===================================================== The following assertion was thrown during a scheduler callback: There are multiple heroes that share the same tag within a subtree. Within each subtree for which heroes are to be animated (i.e. a PageRoute subtree), each Hero must have a unique non-null tag. In this case, multiple heroes had the following tag: fab Here is the subtree for one of the offending heroes: Hero tag: fab dependencies: [_ModalScopeStatus] state: _HeroState#7a012 When the exception was thrown, this was the stack: #0 Hero._allHeroesFor.inviteHero. (package:flutter/src/widgets/heroes.dart:277:11) #1 Hero._allHeroesFor.inviteHero (package:flutter/src/widgets/heroes.dart:288:8) #2 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:315:13) #3 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:6886:14) #4 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:321:15) #5 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:5669:14) #6 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:321:15) #7 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:6886:14) #8 Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:321:15) #9 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:5669:14) // ... #248 Element.visitChildElements (package:flutter/src/widgets/framework.dart:3835:5) #249 Hero._allHeroesFor (package:flutter/src/widgets/heroes.dart:324:13) #250 HeroController._startHeroTransition (package:flutter/src/widgets/heroes.dart:984:14) #251 HeroController._maybeStartHeroTransition. (package:flutter/src/widgets/heroes.dart:939:9) #252 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1397:15) #253 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1331:11) #254 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1176:5) #255 _invoke (dart:ui/hooks.dart:312:13) #256 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:419:5) #257 _drawFrame (dart:ui/hooks.dart:283:31) ==================================================================================================== ```

The same error is not present on Android. Becaues of that, I am not sure whether this needs solving or not.

[DDavidPrime]

The iOS build issue is fixed. As for the hero animation log, because it not reliably reproduced, we can leave it be and move forward.

[StanevPrime]

@JvnSlv, @DDavidPrime what's the expected action item here ?

[DDavidPrime]

There aren't any items left with this one, so unless @JvnSlv says otherwise we can close this ticket.

[JvnSlv]

Correct, this can be closed since everything is done