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Laravel 模型使用软删除-左连接查询-表起别名示例

程序员文章站 2022-03-26 09:09:24
事情是这样的,有天写了一个左连接查询,由于表名太长,所以分别给起个别名,代码如下: public function detail() { $result = take...

事情是这样的,有天写了一个左连接查询,由于表名太长,所以分别给起个别名,代码如下:

public function detail()
{
  $result = takeordermodel::query()
    ->from('take_order as order')
    ->leftjoin('take_order_detail as detail', 'order.id', '=', 'detail.take_order_id')
    ->get();
  dd($result);
}

执行后,报错 column not found: 1054 unknown column take_order.delete_time。

查看解决办法的,直接看底部

sql:

select * from take_order as order
left join take_order_detail as detail
on order.take_order_id = detail.take_order_id
where take_order.delete_time is null

显而易见:软删除查询条件的表名是全名,所以报错了。

分析

软删除作用域 softdeletingscope 源码:

/**
 * apply the scope to a given eloquent query builder.
 *
 * @param \illuminate\database\eloquent\builder $builder
 * @param \illuminate\database\eloquent\model $model
 * @return void
 */
public function apply(builder $builder, model $model)
{
  $builder->wherenull($model->getqualifieddeletedatcolumn());
}

查看 getqualifieddeletedatcolumn 源码:

/**
 * get the fully qualified "deleted at" column.
 *
 * @return string
 */
public function getqualifieddeletedatcolumn()
{
  return $this->qualifycolumn($this->getdeletedatcolumn());
}

查看 qualifycolumn 源码:

/**
 * qualify the given column name by the model's table.
 *
 * @param string $column
 * @return string
 */
public function qualifycolumn($column)
{
  return $this->model->qualifycolumn($column);
}

查看 qualifycolumn 源码:

/**
 * qualify the given column name by the model's table.
 *
 * @param string $column
 * @return string
 */
public function qualifycolumn($column)
{
  if (str::contains($column, '.')) {
    return $column;
  }

  return $this->gettable().'.'.$column;
}

以上可知: $this->gettable().'.'.$column 即为软删除条件的字段名。

解决办法

代码改成下面这样,加一行 settable 设置表名,就可以了。

$result = (new takeordermodel())
    ->settable('order')
    ->from('take_order as order')
    ->leftjoin('take_order_detail as detail', 'order.take_order_id', '=', 'detail.take_order_id')
    ->get();

因为写代码时要指定具体的查询 columns ,有时表名真的太长,看着很不舒服,所以有此尝试。嗯,9 点了,下班。

以上这篇laravel 模型使用软删除-左连接查询-表起别名示例就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持。