CODEWITHSUNDEEP
solr
dalore
dalore

Reputation: 5834

Is it possible in solr to specify an ordering of documents

Not a generic sort field, but say a list of document IDs I want returned in that order.

Example: document_ids = [5, 3, 10, 6]

Can I query solr for documents 5, 3, 10, 6 in that order?

Upvotes: 8

Views: 6360

Answers (2)

Ahmad Abdelghany
Ahmad Abdelghany

Reputation: 13198

Instead of boosts, Solr supports ConstantScore with the ^= operator. It basically assigns the specified constant score to any matching documents which is desirable when you only care about matches for a particular clause and don’t want other relevancy factors such as term frequency. So you can simply get your desired order by specifying a descending constant score for the ids in the query.

q=id:(id1^=4 OR id2^=3 OR id3^=2 OR id4^=1)

This will assign a constant score of 4 to a document with id=id1 (so it will come first), a score of 3 to a document with id=id2, etc.

Upvotes: 0

cheffe
cheffe

Reputation: 9500

Using Boost Query

You can use the bq param (Boost Query) for this and then sort by score, which is default.

q=id:5+OR+id:3+OR+id:10+OR+id:6&bq=id:5^4+id:3^3+id:10^2

As you can see within the bq parameter each of the IDs gets a declining boost value, until the last one - in your case 6 - does not receive any boost any more. Since you search by ID, each document would have the same score, so boosting them that way will get you the sort order you want.

Some reference about the parameter

Using Term Boosting

In case you are using the Standard Request Handler or the (e)DisMax this works in any case

q=id:5^4+OR+id:3^3+OR+id:10^2+OR+id:6

This makes use of Term Boosting, which is explained in the reference documentation below the topic Boosting a Term with ^. The logic keeps the same as above.

Upvotes: 10

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