feat: accept multiple objectIDs

[francoischalifour]

Description

In the context of a shopping cart, getting recommendations based on all items is a common pattern. This updates the API to accept multiple objectIDs as references to get recommendations from.

How it works

• We get recommendations for each object ID passed to objectIDs via searchClient.getObjects, with a hitsPerPage value divided by the number of objectIDs
• We then build an Algolia query for each of these recommendations
• The recommendations can contain duplicate objectIDs, so we remove any duplications.
• We sort the recommendations by their scores to merge the recommendations coming from all the objectIDs in a continuous way

Questions

• We might want to sort before deduping so that the lowest scored version of the item gets removed?

[Shipow]

thanks!!!

[shortcuts]

We might want to sort before deduping so that the lowest scored version of the item gets removed?

If it's possible to have 2 recommend score for the same objectID, yes

[francoischalifour]

@shortcuts I noted it on my board—I'll take care of deduping correctly in another PR along with some tests.