MongoDB query produces OR response instead of AND -


i'm using mongodb version 2.6.5 , have collection looks this:

{   "_id": objectid("555a3398f4c572a44f877dcd"),   "created": isodate("2015-05-18t17:02:14.951z"),   "values": [     {       "value": "4",       "label": "apple"     },     {       "value": "5",       "label": "peach"     },     {       "value": "5",       "label": "banana"     },     {       "value": "4",       "label": "orange"     }   ],   "__v": 0 } {   "_id": objectid("555a74dbdfe135105faccdf7"),   "created": isodate("2015-05-18t21:27:37.064z"),   "values": [     {       "value": "2",       "label": "apple"     },     {       "value": "3",       "label": "peach"     },     {       "value": "4",       "label": "banana"     },     {       "value": "5",       "label": "orange"     }   ],   "__v": 0 } {   "_id": objectid("555a74f9dfe135105faccdfa"),   "created": isodate("2015-05-18t21:27:37.064z"),   "values": [     {       "value": "1",       "label": "apple"     },     {       "value": "1",       "label": "peach"     },     {       "value": "1",       "label": "banana"     },     {       "value": "1",       "label": "orange"     }   ],   "__v": 0 }

when try document has values.label of "orange" , values.value of "5" should 1 document i'm getting two:

> db.answers.count({ 'values.label':'orange', 'values.value':'5' }) > 2

this selecting 2 documents ids: 555a3398f4c572a44f877dcd (presumably because banana has value of 5 ) , 555a74dbdfe135105faccdf7 (which correct one). can think of why happening?

you're using dot notation (used reach objects) on array. while works in way described, imply or-logic because entire array interpreted object, speak.

you're looking match multiple criteria on documents in array, $elemmatch operator for, i.e.

db.answers.count({ 'values' : { '$elemmatch' : { 'label':'orange', 'value':'5' } } })

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