How to see the "queryDebugString" on MongoDB's Text Search? - mongodb

Question

I'm trying the Text Search functionality from MongoDB, and out there on the internet I can see lots of information where people do this:
db.posts.runCommand("text", {search: '"robots are crazy"'})
And get this:
{
"queryDebugString" : "robot||||robots are||",
"language" : "english",
"results" : [
{
"score" : 0.6666666666666666,
"obj" : {
"_id" : ObjectId("50ebc482214a1e88aaa4ad9e"),
"txt" : "Robots are superior to humans"
}
}
],
"stats" : {
"nscanned" : 2,
"nscannedObjects" : 0,
"n" : 1,
"timeMicros" : 185
},
"ok" : 1
}
I know runCommand("text", ... is deprecated, but I've tried the db.posts.find({ $text: { $search: '"robots are crazy"' } }) approach as well, and nothing there.
How can I see this "queryDebugString" attribute? I've looked for some kind of debug flags to use when starting up mongod, but couldn't find anything.

Answer 1

For more recent versions of Mongo (2.6 at least), use .explain(true) for the verbose output, which will contain a parsedTextQuery field with more, and more readable, information than queryDebugString:
> db.test.find({ "$text" : { "$search" : "cows are lovely" } }).explain(true)
{
"cursor" : "TextCursor",
...
"stats" : {
"type" : "TEXT",
...
"parsedTextQuery" : {
"terms" : ["cow", "love"],
"negatedTerms" : [],
"phrases" : [],
"negatedPhrases" : []
]
}
...
}

Answer 2

Just try this:
db.posts.find({ "text" : '"robots are crazy"' })
Now in Mongo, operations became (in basic state) something like:
db.collection.action({query}}
I think it's enough to start, but try to go to the MongoDB documentation:
http://docs.mongodb.org/manual/