[英]Get the followers on a post efficient way in laravel 5.1
I have build a follower system using Eloquent for API (thanks to John Bupit ) but I am getting very slow query (n+1)
, its taking 5 second for response, here is the way I have done it. 我已经使用Eloquent for API构建了一个跟踪器系统(感谢John Bupit ),但是查询速度非常慢
(n+1)
,它需要5秒钟的响应时间, 这就是我的方法。
I need to know is current user following current post, so I have appended the id
of all users following on every post (which is making a lot of sql queries). 我需要知道当前帖子之后的当前用户,所以我在每个帖子后都附加了所有用户的
id
(这使很多SQL查询成为可能)。
Post Model 邮政模型
/**
* The accessors to append to the model's array form.
*
* @var array
*/
protected $appends = ['followers'];
/**
* Get the list of followers of this post.
*
* @return bool
*/
public function getFollowersAttribute()
{
return $this->followers()->get()->lists('id');
}
As you can see I have added an attribute followers
on model which fetches the lists of ids
user following. 如您所见,我在模型上添加了一个属性
followers
,该属性获取了用户关注的ids
列表。
Is there any other way I can get the following state of post for user, How can I make it faster. 还有什么其他方法可以让用户获得以下发布状态,如何使其更快。
I want to show Following if user is following the post with a count of total followers. 我想显示“关注中”(如果用户正在关注该帖子,并且关注者总数)。
I am returning a paginated list of 20 posts per page from API as json. 我从json返回每页20个帖子的分页列表。
Update 更新
I have tried eager loading and its fast now, but how can I get only the list of user ids, not hole user model. 我尝试过立即加载并快速加载,但是如何只获取用户ID列表,而不获取用户模型。 here is my code
这是我的代码
$post->with([
'followers' => function($q) {
$q->select('user_id'); // select id is giving Column 'id' in field list is ambiguous
},
and its giving me 它给了我
followers: [
{
user_id: 32
},
{
user_id: 3
},
{
user_id: 21
},
{
user_id: 33
},
{
user_id: 46
},
{
user_id: 30
}
]
I want something like 我想要类似的东西
followers : [45,2,45,87,12] //as array of ids
it will cause problem, for example if a post get 1000 follower, I bet it will be slow again, and I cant limit the eager loaded
result 它将导致问题,例如,如果某个帖子获得1000个关注者,我敢打赌它会再次变慢,并且我无法限制
eager loaded
结果
$q->select('user_id')->limit(20); // Limit doesn't work
Other Option 其他选择
One another way will be to cache number of followers on posts table like followers_count
and then some way I can check that logged in user is following the each post using a flag ex. 另一种方式将是跟随者缓存数量上的职位表像
followers_count
,然后一些方法可以检查用户登录这是继使用标志前的每个职位。 is_following
. is_following
。 I dont know I am lost here. 我不知道我在这里迷路了。
Please help guys, how twitter, facebook has done it? 请大家帮忙,twitter,facebook是如何做到的? to get the followers on a post and is current user following given post.
获得关注者的帖子,并且当前用户是给定帖子的当前用户。
You may use something like array_reduce after you get followers
. 获得
followers
后,可以使用array_reduce之类的方法 。
Example: 例:
$followers = array_reduce($post->followers, function ($c, $i) {
$c[] = $i->user_id;
}, []);
Now the $followers
contain all follower id
s. 现在,
$followers
包含所有关注者id
。
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