Cannot create index for new Firestore query feature "array-contains"

Question

I am using the new Firestore query feature

firebase.firestore().collection("articles").where("tags", "array-contains", tag)

to query all the article with specific tags.

The query works fine but the result is not sorted.

I understand how database indexes work and use them with other string fields before but not yet with array type.

When I do the query

firebase.firestore().collection("articles").orderBy("publishTime", "desc").where("tags", "array-contains", tag)

It prompts a link to create index. But that link does not work.

Is this because the new feature is still under development or is there any special step for "array-contains" query type?

It is resolved. Now I can use the provided link to create index under type ARRAY. — Chop TRAN
– Chop TRAN, Commented Aug 15, 2018 at 10:21

Chop TRAN · Accepted Answer · 2018-08-15 11:59:34Z

2

This is now resolved by create the index field under ARRAY type

answered Aug 15, 2018 at 11:59

Chop TRAN

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1 Comment

But I still can see the error on my console + it doesn't filter out the documents.