Cannot assign to read only property '0' of object '[object Array] primeng

I want to sort the data table column but, it doesn't work. below is the code and error I get.when I give a server call to backend from typescript it works. When I use state Management the sorting doesn't work.



<th *ngFor="let col of columns" [pSortableColumn]="col.field" [ngSwitch]="col.field">
{{col.header}}
<p-sortIcon [field]="col.field" ariaLabel="Activate to sort"
ariaLabelDesc="Activate to sort in descending order" ariaLabelAsc="Activate to sort in ascending order"></p-sortIcon>
</th>




device.action

export class LoadDeviceFail implements Action {
readonly type = DeviceMgtActionTypes.LOAD_DEVICE_FAIL;
constructor(public payload: string) { }
}
export class LoadDevices implements Action {
readonly type = DeviceMgtActionTypes.LOAD_DEVICES;
constructor() { }
}
export class LoadDevicesSuccess implements Action {
readonly type = DeviceMgtActionTypes.LOAD_DEVICES_SUCCESS;
constructor(public payload: DeviceModel[]) { }
}


device.effect

@Effect()
loadDevices$ = this.action$.pipe(
ofType(
deviceMgtActions.DeviceMgtActionTypes.LOAD_DEVICES
),
switchMap((action: deviceMgtActions.LoadDevices) => this.restApiService.getAll('/iot/Devices/AllDevices').pipe(

mergeMap((devices: DeviceModel[]) => [
new deviceMgtActions.LoadDevicesSuccess(devices),
new deviceMgtActions.ShowLoader(false),
]),
catchError((error) =>
of(
new deviceMgtActions.LoadDevicesFail(error),
new deviceMgtActions.ShowLoader(false)
)
)
)
)
);


device.reducer

switch (action.type) {
case DeviceMgtActionTypes.LOAD_DEVICES_SUCCESS:
return {
...state,
devices: action.payload,
error: '',
};
case DeviceMgtActionTypes.LOAD_DEVICES_FAIL:
return {
...state,
devices: [],
error: action.payload,
};


devices.ts

getDevices(): void {
this.store.dispatch(new deviceMgtActions.ShowLoader(true));
this.store.dispatch(new deviceMgtActions.LoadDevices());
}


constructor

constructor(private store: Store<fromDeviceMgt.State>)
this.store.pipe(select(fromDeviceMgt.getDevices),
takeWhile(() => this.componentActive))
.subscribe((devices: DeviceModel[]) => {
this.devices = devices;});
}

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