What is the process for subscribing to meta selectors in ngxs and how can state selectors be combined?

Question

What is the process for subscribing to meta selectors in ngxs and how can state selectors be combined?

After browsing through the NGXS official documentation, I came across a solution for retrieving the state of multiple states. According to their recommendations, I need to use the following approach:


export class CityService {
  @Selector([Zoo, ThemePark]) 
  static zooThemeParks(zoos, themeParks) {
    return [
      ...zoos,
      ...themeParks
    ];
  }
}

Can someone please guide me on how to correctly consume this Selector? How can I trigger it within a component using Observables and subscribe to it?

I am currently working with the latest version of NGXS.

angular typescript rxjs observable ngxs

Answer 1

Answer №1

The issue stemmed from the lack of clarification in the documentation regarding zoos and themeParks being arrays, while I mistakenly treated them as objects {} resulting in undefined values.

Although this problem arises in ES6, it would be beneficial to have an additional note addressing such cases in the documentation.

Instead of

return [
          ...zoos,
          ...themeParks
       ];

I had to resort to

return {
           ...zoos,
           ...themeParks
       };

Answer 2

The issue stemmed from the lack of clarification in the documentation regarding zoos and themeParks being arrays, while I mistakenly treated them as objects {} resulting in undefined values.

Although this problem arises in ES6, it would be beneficial to have an additional note addressing such cases in the documentation.

Instead of

return [
          ...zoos,
          ...themeParks
       ];

I had to resort to

return {
           ...zoos,
           ...themeParks
       };

What is the process for subscribing to meta selectors in ngxs and how can state selectors be combined?

Answer №1

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