Trouble referencing variable in Collections.where method within render function

Question

I have run into some trouble with a piece of backbone code. The code below relates to a render function. I can retrieve all the models. My trouble arises when I try to use t

Answer 1

Although it isn't explicitly documented, Collection#where uses strict equality (===) when searching. From the fine source code:

where: function(attrs, first) {
  if (_.isEmpty(attrs)) return first ? void 0 : [];
  return this[first ? 'find' : 'filter'](function(model) {
    for (var key in attrs) {
      if (attrs[key] !== model.get(key)) return false;
    }
    return true;
  });
},

note the attrs[key] !== model.get(key) inside the callback function, that won't consider 10 (a probable id value) and '10' (a probable search value extracted from an <input>) to be a match. That means that:

customers.where({musketeerId: 10});

might find something whereas:

customers.where({musketeerId: '10'});

won't.

You can get around this sort of thing with parseInt:

// Way off where you extract values from the `<input>`...
options.id = parseInt($input.val(), 10);