Query multiple elements in nested JSON Document - json

Question

I have the following sample data in MongoDB:
{
"_id" : ObjectId("54833e93ade1a1521a2a2fe8"),
"fname" : "yumi",
"mname" : "sakura",
"lname" : "kirisaki",
"consultations" : [
{
"medications" : [
"paracetamol",
"ibuprofen",
"carbocisteine"
],
"diagnosis" : [
"sore throat",
"fever",
"cough"
],
"date" : ISODate("2014-12-01T16:00:00Z")
},
{
"medications" : [
"paracetamol",
"carbocisteine",
"afrin"
],
"diagnosis" : [
"cough",
"colds",
"fever"
],
"date" : ISODate("2014-12-11T16:00:00Z")
}
]
}
{
"_id" : ObjectId("54833e93ade1a1521a2a2fe9"),
"fname" : "james",
"mname" : "legaspi",
"lname" : "reyes",
"consultations" : [
{
"medications" : [
"zanamivir",
"ibuprofen",
"paracetamol"
],
"diagnosis" : [
"influenza",
"body aches",
"headache"
],
"date" : ISODate("2014-10-22T16:00:00Z")
},
{
"medications" : [
"carbocisteine",
"albuterol",
"ibuprofen"
],
"diagnosis" : [
"asthma",
"cough",
"headache"
],
"date" : ISODate("2014-11-13T16:00:00Z")
}
]
}
I am trying to query patients with zanamivir AND ibuprofen AND cough:
db.patient.find({
$and:
[
{"consultations.medications":["zanamivir", "ibuprofen"]},
{"consultations.diagnosis":"cough"}
]
}).pretty()
So, in the short sample data, I was hoping james would be returned since he is the only one with zanamivir medication.
Nothing is happening when I enter the above query in cmd. It just goes to the next line (no syntax errors, etc.)
How must I go about the query?

Answer 1

You need the use the $all operator.
db.patient.find({
"consultations.medications": { "$all" : [ "zanamivir", "ibuprofen" ]},
"consultations.diagnosis": "cough"
})

Answer 2

Pretty simple, it's just your first part of the query.
db.patient.find({
$and:[
{"consultations.medications":["zanamivir", "ibuprofen"]},
{"consultations.diagnosis":"cough"}]})
Asking Mongodb to find consultations.medications against ["zanamivir", "ibuprofen"] is asking it to find someone whose medications are equal to ['zanamivir', 'ibuprofen'].
If you want to find people who have had zanamivir and ibuprofen medicated you need to tweak the query to this:
db.patient.find({
$and:[
{"consultations.medications":"zanamivir"},
{"consultations.medications":"ibuprofen"},
{"consultations.diagnosis":"cough"}]})
Enjoy!