Laravel Eloquent ORM save: update vs create - laravel

Question

I've got a table and I'm trying to use the save() method to update/create lines. The problem is that it always create new lines. The following code gives me about 12 lines each time I run it. They don't have a unique id before inserting them but the combination of name and DateTimeCode is unique. Is there's a way to use those two in order for laravel to recognize them as exist()? Should I consider using if exist with create and update instead?
foreach ($x as $y) {
$model = new Model;
$model->name = ''.$name[$x];
$model->DateTimeCode = ''.$DateTimeCode[$x];
$model->value = ''.$value[$x];
$model->someothervalue = ''.$someothervalue[$x];
$model->save();
};

Answer 1

I assume this would work in laravel 4.x:
foreach ($x as $y) {
$model = Model::firstOrCreate(array('name' => name[$x], 'DateTimeCode' => DateTimeCode[$x]));
$model->value = ''.$value[$x];
$model->someothervalue = ''.$someothervalue[$x];
$model->save();
};

Answer 2

I think that in this case you will need to search for it before updating or creating:
foreach ($x as $y) {
$model = Model::where('name', name[$x])->where('DateTimeCode', DateTimeCode[$x])->first();
if( ! $model)
{
$model = new Model;
$model->name = ''.name[$x];
$model->DateTimeCode = ''.DateTimeCode[$x];
}
$model->value = ''.$value[$x];
$model->someothervalue = ''.$someothervalue[$x];
$model->save();
};