Flutter Firebase get documents by array of IDs

Question

How would I get a Query of documents from a collection using a list of IDs? Let's says I have the following:

List<String> someList = ['abc123', 'def456', 'hij789']; // Need to query for these documentIDs

I would normally do the following. But this obviously won't work since I need to query the documentIDs.

Query query = Firestore.instance
        .collection(APIPath.products())
        .where('someField', whereIn: someList);

Doug Stevenson · Accepted Answer · 2020-03-24 02:29:16Z

6

Try using FieldPath.documentId().

Query query = Firestore.instance
        .collection(APIPath.products())
        .where(FieldPath.documentId(), whereIn: someList);

Note that you are limited to 10 items in the list, and this might actually be slower than just requesting each document individually with get().

answered Mar 24, 2020 at 2:29

Doug Stevenson

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3 Comments

zee Over a year ago

This is great thanks! Just curious to know how I would use get() with multiple queries and return a stream. The limit 10 is a bit concerning lol.

Doug Stevenson Over a year ago

I don't know - I suggest asking a new question.

jacktim Over a year ago

any solution to requesting them individually? I am currently trying to do exactly that. I have user which contains a list of playlistIds, and trying to load all the users playlists content asynchronously on start

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