Creating Functions in MongoDB Console

Question

This query returns a result db.graduates.find({student_id: '2010-01016'}).pretty()

and then I built a function

function findStud(name,value){ return db.graduates.find({name:value}); }

on the mongo shell when I run this findStud("student_id","2010-01016") it does not display the results

Answer 1

You need to compose an query object with the key being the value in the nameparameter and value being the value in the parameter value.

function findStud(name,value){
var query = {};
query[name] = value;
return db.graduates.find(query); 
}

By default when you don't do this, name is considered to be a String literal and the query gets executed as db.graduates.find({"name":value}); which searches for a key named name with the specified value, causing the query to fail.

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