How to save array of objects in datastore

[apoorvmote]

Which Category is your question related to?
Datastore

What AWS Services are you utilizing?
Cognito, AWS AppSync, Datastore

Provide additional details e.g. code snippets

This is really stupid

const results = await DataStore.save(new User({name: 'John'}))

this returns User[] So you would naturally assume that you can save multiple users at once.

But following creates an error.

const results = await DataStore.save(new User({name: 'John'}), new User({name: 'Jane'}))

or

const results = await DataStore.save([new User({name: 'John'}), new User({name: 'Jane'})])

or

const results = await DataStore.save(new User({name: 'John'}, {name: 'Jane'}))

why bother returning User[] if you are allowing to save only one item at a time?

Also I used wrong example but for real world use case think of array of invoice items to be added to single invoice.

[manueliglesias]

Hi @apoorvmote

Thanks for the feedback,

this returns User[] So you would naturally assume that you can save multiple users at once.

why bother returning User[] if you are allowing to save only one item at a time?

This seems to be an error in the typescript definition. I'll be labeling this issue as a bug.

Now, internally, the storage adapters return that array and we use it for book keeping purposes, it shouldn't be in the public facing API

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Now, regarding your question:

How to save array of objects in datastore

The answer would be with a regular loop, e.g. for, there is no batch-save as of today

[armenr]

Any chance that we CAN do batch saves now? Or still individual saves?

[Gab1988]

Same here , it would be great to do batch saves!

[apoorvmote]

I got tired of waiting around for this feature and actually since launch of HTTP api its cheaper to use the HTTP API + Lambda for batch save. You will lose benefit of graphql mutation triggering subscription notification but batch save is possible with HTTP API.

[Gab1988]

Hi @apoorvmote , IMHO since you save first on local the performance is not too bad (maybe it's because the size of the DB is relatively small)
Anyhow, following your approach, how do you ensure that local and server data are in sync?
Thanks!

[apoorvmote]

I personally use react-query and you can also try swr from vercel. Its not perfect solution but for now it works. In future I would create websocket connection how github does it when you write comment and if I am on same page then the page refreshes with your comment.

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