Enhancing State Management with Multiple @Select Decorators in NGXS

Question

Enhancing State Management with Multiple @Select Decorators in NGXS

I have a variety of @Selects within a component structured like this:

@Select(ItemState.getMode) mode: Observable<Item>;
@Select(QuestionState.SingleQuestion) question: Observable<Question>;
@Select(ItemState.getItemNames) itemNames: Observable<any>;
@Select(ItemState.getItemStepDetails) itemStepDetails: Observable<any>;

Currently, I am looking to retrieve the values in my ngOnInit() method for each one and store them in variables that can be utilized in my template. My intention is to avoid direct usage with async so I can perform manipulation on them.

What would be the most effective approach to achieve this?

angular rxjs observable ngxs

Answer 1

Answer №1

If you're in search of the perfect operator, look no further than combineLatest, as pointed out by other users.

To simplify your template, consider combining your source selector Observables into a single stream using map instead of multiple component variables. For example:

this.combinedStream$ = combinelatest(mode$, question$, itemName$, itemDetails$)
.pipe(
  map(([m, q, name, detail]) => {
    // Transform the 4 results as needed
    return { .. };
});

By doing this, you can utilize combinedStream$ | async in your template to access the modified data effortlessly with help from the async pipe handling subscriptions automatically.

For those utilizing NGXS and seeking reusable combinations of selectors across different components, explore NGXS's Joining Selectors or Meta Selectors for seamless integration directly within templates.

Answer 2

If you're in search of the perfect operator, look no further than combineLatest, as pointed out by other users.

To simplify your template, consider combining your source selector Observables into a single stream using map instead of multiple component variables. For example:

this.combinedStream$ = combinelatest(mode$, question$, itemName$, itemDetails$)
.pipe(
  map(([m, q, name, detail]) => {
    // Transform the 4 results as needed
    return { .. };
});

By doing this, you can utilize combinedStream$ | async in your template to access the modified data effortlessly with help from the async pipe handling subscriptions automatically.

For those utilizing NGXS and seeking reusable combinations of selectors across different components, explore NGXS's Joining Selectors or Meta Selectors for seamless integration directly within templates.

Enhancing State Management with Multiple @Select Decorators in NGXS

Answer №1

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