how to write mongodb query for 'counting elements in sub-document' -


i have collection this...

{     {         id: 123,         name: "abc",         data: {             type1: 0.78,             type2: 0.89,             type3: 0.67         }         purpose: "commercial"     }, {         id: 124,         name: "pqrs",         data: {             type1: 0.34,             type2: 0.78,         }         purpose: "open"     }, {         id: 125,         name: "xtec",         data: {             type1: 0.48,             type2: 0.56,             type3: 0.67             type4: 0.56,             type5: 0.67         }         purpose: "some other"     } }

i count number of elements in "data" sub-document. 1 post me mongodb query?

or display documents "data" sub-document length = 3

the below query doesn't work

db.test.find({$where : 'data.length = 3'});

any appreciated. thank you!!

regards, raj

try this, put condition inside count method, can use condition use in find method.

db.test.count({...});

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