另一种为不同类型的动作获取条件总和的方法，你可以在你的 中定义一个 hasOne() 关系InstagramAccount 模型如

Another approach to get conditional sum for your different types of action, you can define a hasOne() relation in your InstagramAccount model like

public function history_sum()
{
    return $this->hasOne(InstagramActionsHistory::class, 'account_id')
        ->select('account_id',
            DB::raw('sum(case when action_type = 1 then 0 END) as `like`'),
            DB::raw('sum(case when action_type = 2 then 0 END) as `follow`'),
            DB::raw('sum(case when action_type = 3 then 0 END) as `followBack`')
        )->groupBy('account_id');
}

然后您可以将相关数据预先加载为

Then you can eager load the related data as

$userAddedPagesList = auth()->user()->instagramPages()->with('history_sum')->get();

采用这种方法将仅执行一个额外的查询，以根据您的条件获得 3 个不同的总和结果

Going through with this approach will execute only one extra query to get 3 different sum results based on your criteria

select `account_id`,
sum(case when action_type = 1 then action_type else 0 END) as `like`, 
sum(case when action_type = 2 then action_type else 0 END) as `follow`, 
sum(case when action_type = 3 then action_type else 0 END) as `followBack` 
from `instagram_actions_histories` 
where `instagram_actions_histories`.`account_id` in (?, ?, ?) 
group by `account_id`

虽然与使用 withCount 的其他方法(这也是一个有效的答案)相比，将为每个操作类型添加 3 个相关的相关子查询，这可能会导致性能开销，生成的查询将看起来有些东西如下图

While as compare to other approach (which is a valid answer also) using withCount will add 3 dependent correlated sub queries for each action type which may result as a performance overhead, generated query will look something like below

select `instagram_account`.*, 
(select sum(action_type) from `instagram_actions_histories` where `instagram_account`.`id` = `instagram_actions_histories`.`account_id` and `action_type` = ?) as `like`, 
(select sum(action_type) from `instagram_actions_histories` where `instagram_account`.`id` = `instagram_actions_histories`.`account_id` and `action_type` = ?) as `follow`,
(select sum(action_type) from `instagram_actions_histories` where `instagram_account`.`id` = `instagram_actions_histories`.`account_id` and `action_type` = ?) as `followBack`
from `instagram_account` 
where `instagram_account`.`user_id` = ? 
and `instagram_account`.`user_id` is not null

要检查生成的查询，请参阅Laravel 5.3 - 如何记录页面上的所有查询?

To check the generated queries refer to Laravel 5.3 - How to log all queries on a page?