Making http call and fetching data using selectors in ngrx
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I am a newbie in ngrx and was trying to implement store in my application. I came across one scenario like on the load of my page, I am making an http request and trying to fetch the data from selector. Since http is async and since I am immediately calling the selector method which is throwing an error.
PFB Component code which is triggering a load dispatcher and I was expecting the results in this.products$
ngOnInit() {
this.store.dispatch(new productActions.Load());
this.products$ = this.store.pipe(select(fromProducts.getProducts));
that.initForms();
}
My effects
@Effect()
loadProducts$: Observable<Action> = this.actions$.pipe(
ofType(productActions.productActionTypes.Load),
mergeMap(action =>
this.productService.getProductData().pipe(
map(products=> (new productActions.LoadSuccess(products))),
catchError(err => of(new productActions.LoadFail(err)))
)
)
);
Selector
export const getProducts = createSelector(
getProductFeatureState,
state => state.products
);
The error I am getting is triggering from the above selector method
ERROR TypeError: Cannot read property 'products' of undefined
Is there a way to handle this ? Please share your thoughts on this
Tia
angular6 ngrx ngrx-store
asked Oct 24 '18 at 3:55
PratsPrats
78131728
add a comment |
I am a newbie in ngrx and was trying to implement store in my application. I came across one scenario like on the load of my page, I am making an http request and trying to fetch the data from selector. Since http is async and since I am immediately calling the selector method which is throwing an error.
PFB Component code which is triggering a load dispatcher and I was expecting the results in this.products$
ngOnInit() {
this.store.dispatch(new productActions.Load());
this.products$ = this.store.pipe(select(fromProducts.getProducts));
that.initForms();
}
My effects
@Effect()
loadProducts$: Observable<Action> = this.actions$.pipe(
ofType(productActions.productActionTypes.Load),
mergeMap(action =>
this.productService.getProductData().pipe(
map(products=> (new productActions.LoadSuccess(products))),
catchError(err => of(new productActions.LoadFail(err)))
)
)
);
Selector
export const getProducts = createSelector(
getProductFeatureState,
state => state.products
);
The error I am getting is triggering from the above selector method
ERROR TypeError: Cannot read property 'products' of undefined
Is there a way to handle this ? Please share your thoughts on this
Tia
angular6 ngrx ngrx-store
asked Oct 24 '18 at 3:55
PratsPrats
78131728
The selector is probably "wired" the wrong way; take a look at the example app github.com/ngrx/platform/tree/master/projects/example-app/src/… for an example.
– timdeschryver
Oct 24 '18 at 6:01
add a comment |
I am a newbie in ngrx and was trying to implement store in my application. I came across one scenario like on the load of my page, I am making an http request and trying to fetch the data from selector. Since http is async and since I am immediately calling the selector method which is throwing an error.
PFB Component code which is triggering a load dispatcher and I was expecting the results in this.products$
ngOnInit() {
this.store.dispatch(new productActions.Load());
this.products$ = this.store.pipe(select(fromProducts.getProducts));
that.initForms();
}
My effects
@Effect()
loadProducts$: Observable<Action> = this.actions$.pipe(
ofType(productActions.productActionTypes.Load),
mergeMap(action =>
this.productService.getProductData().pipe(
map(products=> (new productActions.LoadSuccess(products))),
catchError(err => of(new productActions.LoadFail(err)))
)
)
);
Selector
export const getProducts = createSelector(
getProductFeatureState,
state => state.products
);
The error I am getting is triggering from the above selector method
ERROR TypeError: Cannot read property 'products' of undefined
Is there a way to handle this ? Please share your thoughts on this
Tia
angular6 ngrx ngrx-store
asked Oct 24 '18 at 3:55
PratsPrats
78131728
I am a newbie in ngrx and was trying to implement store in my application. I came across one scenario like on the load of my page, I am making an http request and trying to fetch the data from selector. Since http is async and since I am immediately calling the selector method which is throwing an error.
PFB Component code which is triggering a load dispatcher and I was expecting the results in this.products$
ngOnInit() {
this.store.dispatch(new productActions.Load());
this.products$ = this.store.pipe(select(fromProducts.getProducts));
that.initForms();
}
My effects
@Effect()
loadProducts$: Observable<Action> = this.actions$.pipe(
ofType(productActions.productActionTypes.Load),
mergeMap(action =>
this.productService.getProductData().pipe(
map(products=> (new productActions.LoadSuccess(products))),
catchError(err => of(new productActions.LoadFail(err)))
)
)
);
Selector
export const getProducts = createSelector(
getProductFeatureState,
state => state.products
);
The error I am getting is triggering from the above selector method
ERROR TypeError: Cannot read property 'products' of undefined
Is there a way to handle this ? Please share your thoughts on this
Tia
angular6 ngrx ngrx-store
angular6 ngrx ngrx-store
asked Oct 24 '18 at 3:55
PratsPrats
78131728
asked Oct 24 '18 at 3:55
PratsPrats
78131728
asked Oct 24 '18 at 3:55
PratsPrats
78131728
asked Oct 24 '18 at 3:55
PratsPrats
78131728
asked Oct 24 '18 at 3:55
PratsPrats
78131728
78131728
The selector is probably "wired" the wrong way; take a look at the example app github.com/ngrx/platform/tree/master/projects/example-app/src/… for an example.
– timdeschryver
Oct 24 '18 at 6:01
add a comment |
The selector is probably "wired" the wrong way; take a look at the example app github.com/ngrx/platform/tree/master/projects/example-app/src/… for an example.
– timdeschryver
Oct 24 '18 at 6:01
The selector is probably "wired" the wrong way; take a look at the example app github.com/ngrx/platform/tree/master/projects/example-app/src/… for an example.
– timdeschryver
Oct 24 '18 at 6:01
The selector is probably "wired" the wrong way; take a look at the example app github.com/ngrx/platform/tree/master/projects/example-app/src/… for an example.
– timdeschryver
Oct 24 '18 at 6:01
add a comment |
1 Answer
1
active
oldest
votes
Setting an empty initial state fixed the issue
answered Nov 17 '18 at 4:38
PratsPrats
78131728
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Setting an empty initial state fixed the issue
answered Nov 17 '18 at 4:38
PratsPrats
78131728
add a comment |
Setting an empty initial state fixed the issue
answered Nov 17 '18 at 4:38
PratsPrats
78131728
add a comment |
Setting an empty initial state fixed the issue
answered Nov 17 '18 at 4:38
PratsPrats
78131728
Setting an empty initial state fixed the issue
answered Nov 17 '18 at 4:38
PratsPrats
78131728
answered Nov 17 '18 at 4:38
PratsPrats
78131728
answered Nov 17 '18 at 4:38
PratsPrats
78131728
answered Nov 17 '18 at 4:38
PratsPrats
78131728
78131728
add a comment |
add a comment |
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The selector is probably "wired" the wrong way; take a look at the example app github.com/ngrx/platform/tree/master/projects/example-app/src/… for an example.
– timdeschryver
Oct 24 '18 at 6:01