Break up Angular http post into multiple calls

Question

Our service times out if we post too many items at the same time, what I am looking for is the RxJs operator that will allow me to serialise the post into multiple posts, something like

merge( chunk(items, 50).map( chunkItems => this.http.post('endPoint', chunkItems) ) ).pipe( scan((errors, current) => [...errors, ...current], []); )

But I don't want them to run in parallel like merge will, I want it to be like a switchMap that serialises the calls.

chunk is a function that breaks an array up into smaller chunks

export const chunk = (arr, len) => { let chunks = [], i = 0, n = arr && arr.length; while (i < n) { chunks.push(arr.slice(i, (i += len))); } return chunks; };

have you tried this answer - stackoverflow.com/questions/57784571/… — Ismail
– Ismail, Commented Nov 28, 2019 at 5:03

Ashutosh Kushawaha · Accepted Answer · 2019-11-28 05:19:20Z

Suppose you have dataList type of array with agreement count of 3, Try this.

dataList=[data1,data2,data3] const agreement =3 from(dataList).pipe(mergeMap(request=>this.http .post(this.url + this.saveRequestUrl, request, this.options),null,agreement )

Adrian Brand · Accepted Answer · 2019-11-28 06:04:34Z

What I have done is

from(chunk(items, 50)).pipe( concatMap(chunkItems => this.http.post('endPoint', chunkItems)), scan((errors, current) => [...errors, ...current], []) );

Collectives™ on Stack Overflow

Break up Angular http post into multiple calls

2 Answers 2

1 Comment

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Linked

Related