Backbone can't get attribute on model to work with url

I have a collection and a model but hitting issues when trying to save with node.js and mongodb. If I don't set the id attribute in the code, it always does a post. It saves the data but put is never hit. So I decided to try an use the idattribute on the model but then hit the error "error: argument passed in most be a single string etc" now the value of the variable is 100004782669837. If this is too large, do I need to come up with a new kind of index?

This is my model. ActiveId is 100004782669837

   bb.model.ActiveMember = Backbone.Model.extend({   
     idAttribute: "ActiveId",

        defaults: {
        ActiveName: 'Test',
        Handicap: '18',
        Par: '4',
        Putts: '2',
        ActiveId:'1'
    },
    Saved: function(parr,puttt,hand) { 
        var self = this     
        self.save({Par:parr, Putts:puttt,Handicap:hand})
        }

   })

I call this from my collection with the following code

var last_model = self.find(function(item){return item.get("ActiveId") ===  mem;});
last_model.Saved(parr,puttt,hand)

This is where it crashes in the node js line. Its on the mongodb line that the crash happens

util.fixid = function( doc ) {
  console.log('in util fixid')
  if( doc._id ) {
    doc.id = doc._id.toString()  
    delete doc._id
  }
  else if( doc.id ) {
    doc._id = new mongodb.ObjectID(doc.id)
    delete doc.id
  }
  return doc
}

I'm not sure how I can get the id of the model, I have followed some examples but maybe I'm missing something