解决 Laravel 模型中的 increment 和 decrement 方法不触发 observers

你要做的，只是将下面的代码加到模型文件里，比如 account.php 里

<?php
    protected function incrementOrDecrement($column, $amount, $extra, $method)
    {
        $this->{$column} = ($method == 'increment' ? $this->{$column} + $amount : $this->{$column} - $amount);
        $this->fireModelEvent('saving', false);
        $this->{$column} = ($method == 'increment' ? $this->{$column} - $amount : $this->{$column} + $amount);
        $result = parent::incrementOrDecrement($column, $amount, $extra, $method);
        $this->fireModelEvent('saved', false);
        return $result;
    }

当然了，更好的方法是

    public function increment($column, $amount = 1, array $extra = [])
    {
        $this->$column = $this->$column + $amount;

        $this->save();
    }

    public function decrement($column, $amount = 1, array $extra = [])
    {
        $this->$column = $this->$column - $amount;

        $this->save();
    }
}