CODEWITHSUNDEEP
angularrxjs5
d.zurico
d.zurico

Reputation: 99

angular - rxjs Observable array

I'm trying to have an array of categories that contains item but without no luck. This is the code:

public getItemsAndSubcategoriesFromCatAndCategory(catalogue_key: string, category_key: string): Observable<any> {
        return this.categoriesService.getSubCategories(catalogue_key, category_key)
            .combineAll()
            .switchMap((val) => {
                const obj = {};
                this.getItemsInSubcategory(catalogue_key, val[0].key).map((items) => {
                    obj[val[0].key] = items;
                });
                return obj;
            });
    }

the error is:

Argument of type (val: {}) => {} is not assignable to parameter of type (value: {}, index: number) => ObservableInput<{}>

any Idea?

Upvotes: 0

Views: 496

Answers (1)

krystianpe
krystianpe

Reputation: 136

.switchMap needs Observable to be returned instead of {}.

So use

return Observable.of(obj)

instead of

return obj

EDIT:

You can write in more declarative syntax:

.switchMap(([firstValue]) => Observable.of(
  this.getItemsInSubcategory(catalogue_key, firstValue.key)
    .reduce((obj, items) => Object.assign({}, obj, {
      [firstValue.key]: items
    }, {})
))

Upvotes: 0

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