mongodb - Mongo returning an array element -


i have following json document in mongodb added mingoimport.

i trying return single element questions array thequestion equals "q1".

     {    "questions": [      {        "questionentry": {          "id": 1,          "info": {            "seasonnumber": 1,            "episodenumber": 1,            "episodename": "days gone bye"          },          "questionitem": {            "thequestion": "q1",            "attachedelement": {              "type": 1,              "value": ""            }          },          "options": [            {              "type": 1,              "value": "o1"            },            {              "type": 1,              "value": "o1"            }          ],          "answer": {            "questionid": 1,            "answer": 1          },          "metatags": [            "season 1",            "episode 1",            "rick grimmes"          ]        }      },      {        "questionentry": {          "id": 1,          "info": {            "seasonnumber": 1,            "episodenumber": 1,            "episodename": "days gone bye"          },          "questionitem": {            "thequestion": "q2",            "attachedelement": {              "type": 1,              "value": ""            }          },          "options": [            {              "type": 1,              "value": "o2"            },            {              "type": 1,              "value": "o2"            }          ],          "answer": {            "questionid": 1,            "answer": 1          },          "metatags": [            "season 1",            "episode 1",            "rick grimmes",            "glenn rhee"          ]        }      }    ]  }

i ran query db.questions.find({"questions.questionentry.questionitem.thequestion" : "q1"}) retruned whole document (both questionentry's in question array!

i have tried db.questions.find({"questions.questionentry.questionitem.thequestion" : "q1"}, _id:0," questions.questionitem": {$elemmatch : {thequestion: "q1"}}})

but following error: error: error: { "$err" : "can't canonicalize query: badvalue cannot use $elemmatch projection on nested field.", "code" : 17287

is there way limit result array element contains it?

thanks

db.questions.find({},{"questions.questionentry.questionitem.thequestion" : "q1"});

or

db.questions.find({"questions.questionentry.questionitem.thequestion" : "q1"},{'questions.$':1});

please try these.


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