MongoDB text search does not return anything - mongodb

Question

One of my collection no longer returns anything on some search values. Here is a console dump to illustrate the probleme :
meteor:PRIMARY> db['test'].insert({ sku: 'Barrière' });
WriteResult({ "nInserted" : 1 })
meteor:PRIMARY> db['test'].insert({ sku: 'Bannière' });
WriteResult({ "nInserted" : 1 })
meteor:PRIMARY> db['test'].createIndex({ sku: 'text' });
{
"createdCollectionAutomatically" : false,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}
meteor:PRIMARY> db['test'].find({ sku: /ba/i });
{ "_id" : ObjectId("57bbb447fc77800b1e63ba64"), "sku" : "Barrière" }
{ "_id" : ObjectId("57bbb455fc77800b1e63ba65"), "sku" : "Bannière" }
meteor:PRIMARY> db['test'].find({ $text: { $search: 'ba' } });
meteor:PRIMARY> db['test'].find({ $text: { $search: 'Ba' } });
meteor:PRIMARY>
The search returned nothing, even though I clearly added two documents that should match. What's going on? What option/config am I missing?
** Edit **
I tried this query
meteor:PRIMARY> db['test'].find({ $or: [ { $text: { $search: 'ba' } }, { sku: { $regex: 'ba', $options: 'i' } } ] });
Error: error: {
"waitedMS" : NumberLong(0),
"ok" : 0,
"errmsg" : "error processing query: ns=meteor.testTree: $or\n sku regex /ba/\n TEXT : query=ba, language=english, caseSensitive=0, diacriticSensitive=0, tag=NULL\nSort:
{}\nProj: {}\n planner returned error: Failed to produce a solution for TEXT under OR - other non-TEXT clauses under OR have to be indexed as well.",
"code" : 2
}
But I'm not sure how I can make an index to search partial values (i.e. using $regex or other operator). Using a third party indexer seems overkill to me... Surely there is a way to perform a full-text search, as well as a pattern match at once?
Is my only solution to perform two queries and merge the results manually?

Answer 1

Try this:
db['test'].insert({ sku: 'ba ba' });
db['test'].find({ $text: { $search: 'ba' } });
Also refer to mongodb document:
If the search string is a space-delimited string, $text operator performs a logical OR search on each term and returns documents that contains any of the terms.
I think mongodb $text $search just split the string by space and match the whole word. If you need to search part of the word, you may need to use some other framework for help. Maybe you can also use $regex to do this.
If the only requirement is to query the word by prefix, you can use $regex, it can use index if you are only querying by the prefix. Otherwise if will scan the whole collection.