Using variable to specify field in find?

Question

I'm wondering if there is a way to specify the field name in a find by passing in a variable. So instead of doing:

db.myCollection.find({fieldName = 123})

doing something like this:

var myVar = "fieldName";
db.myCollection.find({myVar: 123})

I get that this is a weird thing to do, but i'd like to know if this can be done and if so - how?

Answer 1

Sure - just create an object and pass it in:

var myVar = "fieldName";
var params = {};
params[myVar] = 123;
db.myCollection.find(params)