update

Controller

import 'package:trivia_black/model/point.dart';
import 'package:trivia_black/trivia_black.dart';

class PointController extends ResourceController {
  PointController(this.context);
  ManagedContext context;

  @Operation.post('identifier')
  Future<Response> updateScore(
      @Bind.path('identifier') String identifier) async {
    final query = Query<Point>(context)
      ..where((Point p) => p.identifier).equalTo(identifier);
    Point point = await query.fetchOne();
    point.scored = true;
    final update = Query<Point>(context, values: point)
      ..where((Point p) => p.identifier = point.identifier); // erroring on this line
    point = await update.updateOne();

    return Response.ok(point);
  }
}

ERROR

2019-07-23 09:59:49.451744
[SEVERE] aqueduct: POST /point/f08cc3bc-0ae0-4c46-85b1-eb9529b399fa 4398ms 500 {user-agent : Dart/2.5 (dart:io)\ncontent-type : application/JSON\naccept-encoding : gzip\ncontent-length : 0\nhost : 192.168.1.65:8888\nauthorization : Bearer r1L7RQOb259KXVIFvm9wDtrpEGzeTxZD\n}  NoSuchMethodError: The getter 'length' was called on null.
Receiver: null
Tried calling: length
#0      Object.noSuchMethod  (dart:core-patch/object_patch.dart:50:5)
#1      _PostgresQuery&Object&QueryMixin.where 
package:aqueduct/…/query/mixin.dart:71
#2      PointController.updateScore 
package:trivia_black/controller/point_controller.dart:16
<asynchronous suspension>
#3      _LocalInstanceMirror._invoke  (dart:mirrors-patch/mirrors_impl.dart:327:37)
#4      _LocalInstanceMirror.invoke  (dart:mirrors-patch/mirrors_impl.dart:323:25)
#5      BoundOperation.invoke 
package:aqueduct/…/resource_controller_internal/controller.dart:24
#6      ResourceController._process 
package:aqueduct/…/http/resource_controller.dart:371
<asynchronous suspension>
#7      ResourceController.handle 
package:aqueduct/…/http/resource_controller.dart:138
<asynchronous suspension>
#8      Controller.receive 
package:aqueduct/…/http/controller.dart:174
<asynchronous suspension>
#9      _ControllerRecycler.receive 
package:aqueduct/…/http/controller.dart:402
#10     Controller.receive 
package:aqueduct/…/http/controller.dart:206
<asynchronous suspension>
#11     Controller.receive 
package:aqueduct/…/http/controller.dart:206
<asynchronous suspension>
#12     Router.receive 
package:aqueduct/…/http/router.dart:139
<asynchronous suspension>
#13     _RootZone.runUnaryGuarded  (dart:async/zone.dart:1314:10)
#14     _BufferingStreamSubscription._sendData  (dart:async/stream_impl.dart:336:11)
#15     _BufferingStreamSubscription._add  (dart:async/stream_impl.dart:263:7)
#16     _ForwardingStreamSubscription._add  (dart:async/stream_pipe.dart:132:11)
#17     _MapStream._handleData  (dart:async/stream_pipe.dart:232:10)
#18     _ForwardingStreamSubscription._handleData  (dart:async/stream_pipe.dart:164:13)
#19     _RootZone.runUnaryGuarded  (dart:async/zone.dart:1314:10)
#20     _BufferingStreamSubscription._sendData  (dart:async/stream_impl.dart:336:11)
#21     _BufferingStreamSubscription._add  (dart:async/stream_impl.dart:263:7)
#22     _SyncStreamController._sendData  (dart:async/stream_controller.dart:764:19)
#23     _StreamController._add  (dart:async/stream_controller.dart:640:7)
#24     _StreamController.add  (dart:async/stream_controller.dart:586:5)