类型转换JSON和Bigint

Question

我正在尝试使用laravel查询生成器求和JSON值+整数值，但无法进行类型转换错误，或者写查询时我做错了事。

Data saved in DB
comments: 100
fb_reactions: {"love":0,"like":8,"wow":0,"haha":0,"sad":0,"total":8,"angry":0} 

$content = Content::select('id','social_id','comments','fb_reactions',DB::raw('SUM(fb_reactions->total+comments) as appreciation'))->groupBy('id');

应该给予赞赏= 108

Answer 1

SUM是一个数据库函数，通常可处理多个行数据，而不是同一行中的数据。最好不要在模型实例上进行简单添加，而要在数据库中进行简单添加。

向模型添加accessor：

// Content.php

protected $appends = ['appreciation'];           // auto append to the model
protected $casts = ['fb_reactions' => 'array'];  // auto cast json column to array

public function getAppreciationAttribute() {
    return $this->comments + $this->fb_reactions['total'];
}