fix(core): incorrect error reported when trying to re-create view which had an error during creation (#43005)

Currently if a view throws an error during creation mode, we mark it as `incompleteFirstPass` so that we can try to recover later. The recovery is only possible inside component views.

The problem is that when this was introduced, I forgot to flip the `firstCreatePass` when an error is thrown which meant that calling `renderView` on the same component again is allowed. It will eventually hit an assertion which can be confusing for the end user. This issue only manifests itself when rendering views "manually" through `ViewContainerRef` (e.g. using `NgIf`).

These changes flip the `firstCreatePass` back to false on errors so that trying to re-render the same view will throw an error which is consistent to the one that broke the view during creation.

Fixes #41383.

PR Close #43005
This commit is contained in:
Kristiyan Kostadinov 2021-07-31 12:22:59 +02:00 committed by Andrew Scott
parent f99ec27596
commit 8628826535
3 changed files with 44 additions and 2 deletions

View File

@ -30,7 +30,7 @@
"master": {
"uncompressed": {
"runtime-es2015": 1190,
"main-es2015": 136546,
"main-es2015": 137055,
"polyfills-es2015": 37641
}
}

View File

@ -336,6 +336,7 @@ export function renderView<T>(tView: TView, lView: LView, context: T): void {
// an error, mark the view as corrupted so we can try to recover.
if (tView.firstCreatePass) {
tView.incompleteFirstPass = true;
tView.firstCreatePass = false;
}
throw error;

View File

@ -7,7 +7,7 @@
*/
import {CommonModule} from '@angular/common';
import {ChangeDetectorRef, Component, ComponentFactoryResolver, Directive, EmbeddedViewRef, Injector, Input, NgModule, TemplateRef, ViewChild, ViewContainerRef, ViewRef} from '@angular/core';
import {ChangeDetectorRef, Component, ComponentFactoryResolver, Directive, EmbeddedViewRef, Injectable, Injector, Input, NgModule, TemplateRef, ViewChild, ViewContainerRef, ViewRef} from '@angular/core';
import {TestBed} from '@angular/core/testing';
import {By} from '@angular/platform-browser';
import {onlyInIvy} from '@angular/private/testing';
@ -886,5 +886,46 @@ describe('view insertion', () => {
fixture.detectChanges();
expect(fixture.nativeElement.textContent).toContain('2');
});
it('should consistently report errors raised by createEmbeddedView', () => {
// Intentionally hasn't been added to `providers` so that it throws a DI error.
@Injectable()
class DoesNotExist {
}
@Directive({selector: 'dir'})
class Dir {
constructor(willCauseError: DoesNotExist) {}
}
@Component({
template: `
<ng-template #broken>
<dir></dir>
</ng-template>
`,
})
class App {
@ViewChild('broken') template !: TemplateRef<unknown>;
constructor(private _viewContainerRef: ViewContainerRef) {}
insertTemplate() {
this._viewContainerRef.createEmbeddedView(this.template);
}
}
TestBed.configureTestingModule({declarations: [App, Dir]});
const fixture = TestBed.createComponent(App);
const tryRender = () => {
fixture.componentInstance.insertTemplate();
fixture.detectChanges();
};
fixture.detectChanges();
// We try to render the same template twice to ensure that we get consistent error messages.
expect(tryRender).toThrowError(/No provider for DoesNotExist/);
expect(tryRender).toThrowError(/No provider for DoesNotExist/);
});
});
});