How to delete element from array in firebase starts with string

Question

i have firebase database with something like that

and I want to delete elements starting with "12-07-20210EN5443..." i have no idea how to do that in firebase, and i spend hours on searching. i tried with that

await db.collection('Hotels')
    .doc(hotelName)
    .update({
        [date]: admin.firestore.FieldValue.arrayRemove(fieldName+"%")
    })

Where are you getting fieldName? Is it a string?

Joel Hager
– Joel Hager

2021-07-12 22:47:58 +00:00
Commented Jul 12, 2021 at 22:47 — Joel Hager
– Joel Hager, Commented Jul 12, 2021 at 22:47

Frank van Puffelen · Accepted Answer · 2021-07-13 05:22:26Z

1

There is no single operation that allows you to delete items from an array based on a prefix. The arrayRemove operation looks for an exact, complete match.

So you will need to do this in multiple steps:

Read the matching documents.
Modify their array in your application code.
Write back the modified array.

answered Jul 13, 2021 at 5:22

Frank van Puffelen

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