can we add new field as a unique field for existing collections?
Does unique validation work?
Do you want to
add a unique index on an existing field?
or
add a field for which a unique index exists?
It works in both.
If a unique index exist and add a document with a duplicate value or modify a document with a duplicate value the operation will fail. If you try to create a unique index and duplicates exist the index creation will fail.
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It sounds like you have a collection where a certain field does not yet exist. You can add a sparse index that’s unique which will enforce uniqueness across all the documents which have this field but will ignore documents which don’t have this field.
Does this help?
Asya
2 Likes
Yes, thank you; this was helpful.
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