Rework payment tables, enable payment editing

app/Models/PaymentItem.php

@@ -8,19 +8,29 @@ use App\Traits\{NextKey,PushNew};
 
 class PaymentItem extends Model
 {
-	use NextKey,PushNew;
+	use PushNew;
 	const RECORD_ID = 'payment_item';
-	public $incrementing = FALSE;
 
 	protected $dateFormat = 'U';
 	const CREATED_AT = 'date_orig';
 	const UPDATED_AT = 'date_last';
 
-	protected $table = 'ab_payment_item';
-
 	/* RELATIONS */
 
 	public function payment() {
 		return $this->belongsTo(Payment::class);
 	}
+
+	/* ATTRIBUTES */
+
+	/**
+	 * If our amount is negative, and invoice_id is null, then this is a reversal.
+	 *
+	 * @param $value
+	 * @return float
+	 */
+	public function getAllocAmtAttribute($value): float
+	{
+		return (is_null($this->invoice_id) && $value < 0) ? -$value : $value;
+	}
 }