Spring MongoDB search id by string

Question

I have a simple spring web application which uses mongodb. I have a requirement of searching the collection id by string, where the string should work regex Statement. My criteria creating method looks like this.

public Criteria getSearchCriteriaQuery(String keyword, String colomnArray[]){
    Criteria[] criteriaList = new Criteria[colomnArray.length];
    for (int i=0; i<colomnArray.length; i++) {
        criteriaList[i] = Criteria.where(colomnArray[i]).regex(keyword, "i");
    }
    return this.criteria.orOperator(criteriaList);
}

My domain looks like this

@Document
public class sampleDomain{

@Id
private String id;
....
}

When I use "id" / "_id" as the column name, it does not return anything even if I send a valid string as keyword. example query I tried is given below

id in db - 560299fe627942619bcfdc87
keyword - 560

Is there a solution for this? Thanks in advance

Answer 1

This is not going to work I think. A MongoDb ID is not a String but an ObjectId which can be represented as a String but not handled as one. So doing a regex on an ObjectId would mean mongo would have to unpack every ObjectId to a String and then do the regex on it. That would be crazily inefficient.

Unless Spring-data-mongo has something up his sleeves, you might need to rethink your model and your queries.

Because this is a strange use case for MongoDB to do a regex on an ObjectId. Can you explain why you are doing this and why you are not using another field to do the regex on?

Kind regards Chris