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Observer throw exception using Computed value #44

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copydog opened this issue Jan 17, 2019 · 2 comments
Closed

Observer throw exception using Computed value #44

copydog opened this issue Jan 17, 2019 · 2 comments

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@copydog
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copydog commented Jan 17, 2019 •
edited by katis
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I initialize a Computed value right before initialize my widget, Computed.value will throw an exception in Observer.
however Observable that just created would NOT.
If I initialize the Computed value long time before I initialize my widget, Computed.value will NOT throw an exception.

btw, I am using master branch, and I am using it in a real project.

here is the stacktrace:

flutter: # 0      Computed.value (file:///Users/shallow/Codes/dfe/db-app-flutter/packages/mobx/lib/src/core/computed.dart:81:7)
flutter: # 1      _ProfileCenterState._buildTop.<anonymous closure> (package:doubi/foundation/view/profile_center/profile_center.dart:149:66)
flutter: # 2      ObserverState.build (package:flutter_mobx/flutter_mobx.dart:46:21)
flutter: # 3      StatefulElement.build (package:flutter/src/widgets/framework.dart:3809:27)
flutter: # 4      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3721:15)
flutter: # 5      Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
flutter: # 6      ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
flutter: # 7      StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3848:11)
flutter: # 8      ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
flutter: # 9      Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 10     MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4965:32)
flutter: # 11     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 12     MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4965:32)
flutter: # 13     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 14     MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4965:32)
flutter: # 15     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 16     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: # 17     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
flutter: # 18     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
flutter: # 19     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
flutter: # 20     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
flutter: # 21     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 22     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: # 23     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
flutter: # 24     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
flutter: # 25     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
flutter: # 26     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
flutter: # 27     ParentDataElement.mount (package:flutter/src/widgets/framework.dart:4047:11)
flutter: # 28     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 29     MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4965:32)
flutter: # 30     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 31     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: # 32     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
flutter: # 33     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 34     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: # 35     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
flutter: # 36     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
flutter: # 37     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
flutter: # 38     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
flutter: # 39     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 40     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: # 41     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
flutter: # 42     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 43     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: # 44     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
flutter: # 45     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 46     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: # 47     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
flutter: # 48     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
flutter: # 49     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
flutter: # 50     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
flutter: # 51     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 52     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: # 53     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
flutter: # 54     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
flutter: # 55     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
flutter: # 56     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
flutter: # 57     ParentDataElement.mount (package:flutter/src/widgets/framework.dart:4047:11)
flutter: # 58     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 59     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: # 60     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
flutter: # 61     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
flutter: # 62     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
flutter: # 63     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3848:11)
flutter: # 64     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
flutter: # 65     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
flutter: # 66     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
flutter: # 67     SliverMultiBoxAdaptorElement.updateChild (package:flutter/src/widgets/sliver.dart:1028:36)
flutter: # 68     SliverMultiBoxAdaptorElement.createChild.<anonymous closure> (package:flutter/src/widgets/sliver.dart:1013:20)
flutter: # 69     BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2266:19)
flutter: # 70     SliverMultiBoxAdaptorElement.createChild (package:flutter/src/widgets/sliver.dart:1006:11)
flutter: # 71     RenderSliverMultiBoxAdaptor._createOrObtainChild.<anonymous closure> (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:274:23)
flutter: # 72     RenderObject.invokeLayoutCallback.<anonymous closure> (package:flutter/src/rendering/object.dart:1730:58)
flutter: # 73     PipelineOwner._enableMutationsToDirtySubtrees (package:flutter/src/rendering/object.dart:799:15)
flutter: # 74     RenderObject.invokeLayoutCallback (package:flutter/src/rendering/object.dart:1730:13)
flutter: # 75     RenderSliverMultiBoxAdaptor._createOrObtainChild (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:263:5)
flutter: # 76     RenderSliverMultiBoxAdaptor.addInitialChild (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:341:5)
flutter: # 77     RenderSliverList.performLayout (package:flutter/src/rendering/sliver_list.dart:78:12)
flutter: # 78     RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 79     RenderSliverPadding.performLayout (package:flutter/src/rendering/sliver_padding.dart:182:11)
flutter: # 80     RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 81     RenderViewportBase.layoutChildSequence (package:flutter/src/rendering/viewport.dart:405:13)
flutter: # 82     RenderViewport._attemptLayout (package:flutter/src/rendering/viewport.dart:1316:12)
flutter: # 83     RenderViewport.performLayout (package:flutter/src/rendering/viewport.dart:1234:20)
flutter: # 84     RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 85     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 86     RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 87     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 88     RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 89     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 90     RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 91     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 92     RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 93     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 94     RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 95     MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:142:11)
flutter: # 96     _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:339:7)
flutter: # 97     MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:212:7)
flutter: # 98     RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:356:14)
flutter: # 99     RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 100    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 101    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 102    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 103    _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1188:11)
flutter: # 104    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 105    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 106    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 107    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 108    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 109    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 110    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 111    RenderStack.performLayout (package:flutter/src/rendering/stack.dart:510:15)
flutter: # 112    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 113    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 114    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 115    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 116    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 117    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 118    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 119    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 120    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 121    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 122    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 123    RenderOffstage.performLayout (package:flutter/src/rendering/proxy_box.dart:2879:14)
flutter: # 124    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 125    RenderStack.performLayout (package:flutter/src/rendering/stack.dart:510:15)
flutter: # 126    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 127    __RenderTheatre&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: post http://api.idoubi.top:18010/api-business/user/profile {code: 0, message: success, data: {id: 4, nickname: 哦~, avatarUrl: /images/usericon/4.png, wechatNumber: yay, credit: 100, signature: 这个人很懒，什么都没写。, country: 中国, province: 上海市, city: 上海市, gender: 2, remainder: 74013265, prize: 100, fanNumber: 1, friendNumber: 7, followNumber: 1, jgname: ocZI-2yXKmj3mPq2FC5FyNpMOL51}, time: 2019-01-17 12:14:59}
flutter: # 128    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 129    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 130    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 131    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 132    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 133    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 134    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 135    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 136    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 137    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
flutter: # 138    RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
flutter: # 139    RenderStack.performLayout (package:flutter/src/rendering/stack.dart:510:15)
flutter: # 140    RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1509:7)
flutter: # 141    PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:768:18)
flutter: # 142    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:281:19)
flutter: # 143    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:677:13)
flutter: # 144    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:219:5)
flutter: # 145    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:990:15)
flutter: # 146    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:930:9)
flutter: # 147    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:842:5)
flutter: # 148    _invoke (dart:ui/hooks.dart:154:13)
flutter: # 149    _drawFrame (dart:ui/hooks.dart:143:3)

Edit by @katis : quoted the stacktrace as it was accidentally referencing every issue we have
@copydog copydog changed the title Observer throw exception using Computed Observer throw exception using Computed value Jan 17, 2019
@pavanpodila
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@copydog Its awesome that you are already trying out on a real project 👍

I suggest you create the computed-value outside of the build method. Ideally put the state in a separate class and use that class in the StatefulWidget. I should have an example soon.

@copydog
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copydog commented Jan 18, 2019 •
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I did put computed-value outside the build method. It initialized Computed.value in the initState() of the State that using Observer. I will double check this exception and send a small example if located the problem (if there is any).

@copydog copydog closed this as completed Jan 18, 2019
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