问题
On the system: Dart VM version: 2.9.0-14.0.dev.flutter-2b917f5b6a (be) (Wed Jun 10 15:46:47 2020 +0000) on "windows_x64"
It is OK when run "aqueduct db generate" to create 00000001_initial.migration.dart But, after edit models and rerun "aqueduct db generate", I get the message as below. After delete 00000001_initial.migration.dart and rerun, it is OK.
The message:
-- Aqueduct CLI Version: 3.3.0+1 -- Aqueduct project version: 3.2.0 *** Uncaught error Bad state: NoSuchMethodError: The getter 'length' was called on null. Receiver: null Tried calling: length **** Stacktrace
- #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
- #1 _ClassMirror.newInstance (dart:mirrors-patch/mirrors_impl.dart:653:44)
- #2 Executable.instanceOf (data:application/dart:14:813)
- #3 SchemaBuilderExecutable.execute (data:application/dart:13:873)
- #4 main (data:application/dart:9:35)
- #5 _startIsolate. (dart:isolate-patch/isolate_patch.dart:297:32)
- #6 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)
Please help me!
回答1:
It's a bug and it's still there. Happens when there is a previous migration file.
Just erase migrations/00000001_initial.migration.dart and then aqueduct db generate will work as expected.
Tested on Aqueduct 4.0.0-b1
p.s. I know it's the same solution given in the question but I was having the same problem and the solution wasn't clear at first.
回答2:
They actually fixed it
It's just not on pub.dev yet.
回答3:
You can try to downgrade the Dart version.
brew tap dart-lang/dart
brew uninstall dart
brew install dart@2.8
It helped me.
UPDATED:
Here is the content of my pubspec.yaml file:
name: mysecurename
description: mysecuredescription
version: 0.1.0
environment:
sdk: ">=2.7.0 <3.0.0"
dependencies:
aqueduct: ^4.0.0-b1
analyzer: '>=0.32.0 <0.41.0'
runtime: ^1.0.0-5
http: ^0.12.0+4
mime: ^0.9.6+3
dev_dependencies:
test: ^1.0.0
aqueduct_test: ^2.0.0-b1
来源：https://stackoverflow.com/questions/62608021/aqueduct-db-generate-error-bad-state-nosuchmethoderror-the-getter-length-wa