Laravel array validation old values

Using Laravel 5.4 I have a form with array inputs called: coffee_kg_bags

In my form:

<input type="text" name="kg_bags[]" value="">

In my controller I do all kinds of validations and I get an error, but I don't get the old value in the form.

I entered 2 values on fields: $cof->id = 1 and $cof->id = 2

I get an error on the field with $cof->id = 1 but I don't get the old values.

In the update method in the controller:

dd(Input::get('kg_bags.2'));

Gives the value I entered

But: dd(Input::old('kg_bags.2'));

Gives null.

dd(Input::old());

Gives an empty array

Why is that?

via Chebli Mohamed