meteor if document exists return true/false

Question

How can I determine if a document exists within a collection in Meteor?

Edited: New code.

the mongodb has a document with the ProductName: Apples the inputproduct is "Apples"

var exists = Products.find({ProductName: inputproduct});
                    if(exists)
                    {
                        alert("it exists");
                    }else{
                        alert('doesnt exist');
                    }

all I get back is : "it exists" regardless of the value of inputproduct. I have output what inputproduct is and it comes back "Apples" no problem. Not sure what is going on here. Tried it several ways using find or findOne and nothing.

Answer 1

You almost had it. However, meteor's collection.findOne will return the first object which matched, or undefined (which is falsy) if no match was found. Try this:

var exists = Products.findOne(selector, projection);
if(exists)
 {
    do something...
 }