Question

当我尝试使用here is an example on web Hive.box（'box_name'）。listenable（）时，如果没有键，则会发生错误；

════════ Exception caught by widgets library ═══════════════════════════════════
The following NoSuchMethodError was thrown building FutureBuilder<dynamic>(dirty, state: _FutureBuilderState<dynamic>#566bb):
The method 'toSet' was called on null.
Receiver: null
Tried calling: toSet()

The relevant error-causing widget was
    FutureBuilder<dynamic> 
package:hive_benchmark/sketcpad/sketchpad.dart:109
When the exception was thrown, this was the stack
#0      Object.noSuchMethod  (dart:core-patch/object_patch.dart:53:5)
#1      BoxX.listenable 
package:hive_flutter/src/box_extensions.dart:11
#2      _DrawingScreenState.build.<anonymous closure> 
package:hive_benchmark/sketcpad/sketchpad.dart:120
#3      _FutureBuilderState.build 
package:flutter/…/widgets/async.dart:732
#4      StatefulElement.build 
package:flutter/…/widgets/framework.dart:4619
...
════════════════════════════════════════════════════════════════════════════════

Answer 1

自astroid==2.3.3 attrs==19.3.0 behave==1.2.6 certifi==2019.11.28 chardet==3.0.4 idna==2.8 isort==4.3.21 lazy-object-proxy==1.4.3 lxml==4.4.2 mccabe==0.6.1 parse==1.14.0 parse-type==0.5.2 Pillow==5.4.1 pylint==2.4.4 pypng==0.0.20 requests==2.22.0 six==1.14.0 tinycss2==0.6.1 transitions==0.6.9 typed-ast==1.4.0 ua-parser==0.8.0 urllib3==1.25.7 webencodings==0.5.1 wrapt==1.11.2 xmlrunner==1.7.7 regex==2020.5.7刚刚升级依赖项以来，此问题已解决

Hive.box（'box_name'）。listenable（）get，`toSet'方法在null上被调用，在flutter上出错

1 个答案: