How to avoid api call if argument is null in forKJoin in angular 5?

Question

this.hobbies :any[]=[];
this.worklist : any[]=[];
forkJoin(this.personService.addHobbies(this.hobbies),this.professionService.updateWorks(this.worklist))
        .subscribe(res => {});

here i'm calling 2 apis this.personService.addHobbies(this.hobbies) and this.professionService.updateWorks(this.worklist) with forkJoin, but i want to avoid api call this.personService.addHobbies() if this.hobbies is empty list.. only this.professionService.updateWorks(this.worklist) should call if this.worklist is not empty list. Is there any solution to avoid that particular api call if list is null or empty.. Please help

MaisOuEtDoncOrNiCar · Accepted Answer · 2022-04-13 13:52:53Z

1

You can use an array in which you add your API calls :

this.hobbies: any[] = [];
this.worklist: any[] = [];
        
const requests = [];
if (this.hobbies.length > 0){
  requests.push(this.personService.addHobbies(this.hobbies));
}
if (this.worklist.length > 0) {
  requests.push(this.professionService.updateWorks(this.worklist));
}

forkJoin(requests).subscribe(res => {});

answered Apr 13, 2022 at 13:52

MaisOuEtDoncOrNiCar

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