Save row for every date in date range to DB table from one from

If I understand what you want - you can iterate over Carbon dates quite easily:

/**
 * I have a date and end_date input in a form.
 * If the end date is greater than the date I would like the form to
 * save 1 row for every date in the range between date and end_date.
 */
public function store(Request $request)
{
    $this->validate(request(), [
        'paddock'  => 'required',
        'mob'      => 'required',
        'date'     => 'required|date',
        'end_date' => 'date',
    ]);

    $s = Carbon::parse($request->date);
    $e = Carbon::parse($request->end_date);

    for ($i = $s->copy(); $i < $e; $i->addDay()) {  // If the end_date is greater than the date
        $rotation = \App\Rotation::create([         // save 1 row for every date in the range
            'date'     => $i,
            'paddock'  => request('paddock'),
            'divide'   => request('divide'),
            'grazing'  => request('grazing'),
            'mob'      => request('mob'),
            'end_date' => request('end_date'),
            'team_id'  => $request->user()->currentTeam->id,
        ]);
    }

    return redirect('/rotations/' . $request->get('mob'));
}

@burlresearch thanks! That worked!