/**
  * For mass transaction updating
  * (adding the same budgets to many transactions)
  * Called from TransactionsController update method
  * @param Request $request
  * @param Transaction $transaction
  * @return Transaction
  */
 public function addBudgets(Request $request, Transaction $transaction)
 {
     $budgetIds = $request->get('budget_ids');
     //Prepare the data for the pivot table
     $pivotData = array_fill(0, count($budgetIds), ['allocated_percent' => 100, 'calculated_allocation' => $transaction->total]);
     $syncData = array_combine($budgetIds, $pivotData);
     $transaction->budgets()->sync($syncData, false);
     return $transaction;
 }