A guide on how to follow a specific item in an Angular 2 store

I have integrated ngrx store into my Angular2 application.

The store reducer contains two objects as shown below:

export function loadSuccessNamesAction(state: StoreData, action: loadSuccessNamesAction): StoreData {
    const namesDataState = Object.assign({}, state);
   namesDataState.isSpinner = false;
   namesDataState.names = action.payload.names;
   return namesDataState;
}

export function loadSuccessSubjectAction(state: StoreData, action: loadSuccessSubjectAction): StoreData {
    const subjectDataState = Object.assign({}, state);
   subjectDataState.isSpinner = false;
   subjectDataState.subject = action.payload.subject;
   return namesDataState;
}

In my component, I need to access the namesDataState object only. How can I subscribe to only one specific object in the store?

Currently, I am subscribing to the entire store, but I would like to subscribe to just the first object.

If you have any solutions, they would be greatly appreciated. Thank you.

Answer №1

Check out the distinctUntilKeyChanged method here

this.store.select('namesDataState')
  //Only emit when any name has changed
  .distinctUntilKeyChanged(
    //Filter by this key
    'name',
    //Optional custom comparison function for keys 
    (x, y) => x.name === y.name)
  .pluck('name')
  .subscribe((name: any) => {});

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