larsjanssen6 / increment-decrement

        $between = [$model->{$this->column}, $middle];

        if ($model->{$this->column} != $middle) {

            if ($model->{$this->column} > $middle) {

                $result = $model::whereBetween($this->column, array_reverse($between))->get();

                $result->each->increment($this->column);

            }

            if ($model->{$this->column} < $middle) {

                $result = $model::whereBetween($this->column, $between)->get();

                $result->each->increment($this->column);

            }

            if ($model->{$this->column} < $middle) {

                $result = $model::whereBetween($this->column, $between)->get();

                $result->each->decrement($this->column);

            }

            $model->{$this->column} = $middle;

            $model->save();