Spring data mongo query with regex within an array - regex

Question

I have a collection with structure somewhat like this :
{
"organization" : "Org1",
"active" : true,
"fields" : [
{
"key" : "key1",
"value" : "table"
},
{
"key" : "key2",
"value" : "Harrison"
}
]
}
I need to find all documents with organization : "Org1", active : true, and regex match the 'value' in fields.
In mongo shell, it works perfectly. I tried the query:
db.collection.find({"organization" : "Org1", "active" : true, "fields" : {$elemMatch : {"key" : "key2","value" : {$regex : /iso/i}}}}).pretty()
But when I tried to convert it to a Java code with Spring, it gives wrong results.
1. This one will give documents even if it didn't match the pattern:
#Query("{'organization' : ?0, 'active' : true, 'fields' : {$elemMatch : {'key' : ?1, 'value' : {$regex : ?2}}}}")
List<ObjectCollection> findFieldDataByRegexMatch(String org, String key, String pattern);
This one doesn't give any documents even though it should.
MongoTemplate MONGO_TEMPLATE = null;
try {
MONGO_TEMPLATE = multipleMongoConfig.secondaryMongoTemplate();
} catch (Exception e) {
e.printStackTrace();
}
List<Criteria> criteriaListAnd = new ArrayList<Criteria>();
Criteria criteria = new Criteria();
String pattern = "/iso/i";
criteriaListAnd.add(Criteria.where("organization").is("Org1"));
criteriaListAnd.add(Criteria.where("active").is(true));
criteriaListAnd.add(Criteria.where("fields").elemMatch(Criteria.where("key").is(key).and("value").regex(pattern)));
criteria.andOperator(criteriaListAnd.toArray(new Criteria[criteriaListAnd.size()]));
Query query = new Query();
query.addCriteria(criteria);
List<ObjectCollection> objects = MONGO_TEMPLATE.find(query, ObjectCollection.class);
What am I missing here and how should I form my query?

Answer 1

You are making a very small mistake, in the pattern you are passing / which is the mistake, it took me half an hour to identify it, finally, I got it after enabling the debug log of spring boot.
For the first query, it should be called as below:
springDataRepository.findFieldDataByRegexMatch("Org1", "key2", "iso")
And the query should be modified in the Repository as to hanlde the case sensetivity:
#Query("{'organization' : ?0, 'active' : true, 'fields' : {$elemMatch : {'key' : ?1, 'value' : {$regex : ?2, $options: 'i'}}}}")
List<Springdata> findFieldDataByRegexMatch(String org, String key, String pattern);
The same issue in your second query also, just change String pattern = "/iso/i"; to String pattern = "iso" or String pattern = "iso.*" ;
Both will start working, For details please check the my GitHub repo https://github.com/krishnaiitd/learningJava/blob/master/spring-boot-sample-data-mongodb/src/main/java/sample/data/mongo/main/Application.java#L60
I hope this will resolve your problem.