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# Which Problems Are Solved - #9382 "When I log in and get to my user profile page, I get an empty error message at the top:" # How the Problems Are Solved load metadata using user service # Additional Changes - The roles observable returns an empty array instead of never emiting - Small refactorings in app.component.ts because at first I thought the errors stems from there. - Added withLatestFromSynchronousFix RXJS operator because withLatestFrom has confusing behavior when used in synchronous contexts. Why this operator is needed is described here: https://github.com/ReactiveX/rxjs/issues/7068 # Additional Context - Closes #9382
20 lines
914 B
TypeScript
20 lines
914 B
TypeScript
import { combineLatestWith, distinctUntilChanged, Observable, ObservableInput, ObservableInputTuple } from 'rxjs';
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import { map } from 'rxjs/operators';
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// withLatestFrom does not work in this case, so we use
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// combineLatestWith + distinctUntilChanged
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// here the problem is described in more detail
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// https://github.com/ReactiveX/rxjs/issues/7068
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export const withLatestFromSynchronousFix =
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<T, A extends readonly unknown[]>(...secondaries$: [...ObservableInputTuple<A>]) =>
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(primary$: Observable<T>) =>
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primary$.pipe(
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// we add the index, so we can distinguish
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// primary submissions from each other,
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// and then we can only emit when primary changes
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map((primary, i) => <const>[primary, i]),
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combineLatestWith(...secondaries$),
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distinctUntilChanged(undefined!, ([[_, i]]) => i),
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map(([[primary], ...secondaries]) => <const>[primary, ...secondaries]),
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);
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