在用户的编辑个人资料页面上,我想显示当前登录用户详细信息的现有值,如姓名,电子邮件,性别等。我的问题如下
$user = Auth::user();
这样的变量,然后像常规对象一样将它传递给$ user?每次使用时,在给定视图文件上多次使用Auth :: user()会命中我的数据库吗?
提前致谢。
答案 0 :(得分:5)
如果查看SessionGuard.php
中的Illuminate\Auth
文件,您会看到用于检索当前经过身份验证的用户的方法user()
:
/**
* Get the currently authenticated user.
*
* @return \Illuminate\Contracts\Auth\Authenticatable|null
*/
public function user()
{
if ($this->loggedOut) {
return;
}
// If we've already retrieved the user for the current request we can just
// return it back immediately. We do not want to fetch the user data on
// every call to this method because that would be tremendously slow.
if (! is_null($this->user)) {
return $this->user;
}
$id = $this->session->get($this->getName());
// First we will try to load the user using the identifier in the session if
// one exists. Otherwise we will check for a "remember me" cookie in this
// request, and if one exists, attempt to retrieve the user using that.
$user = null;
if (! is_null($id)) {
if ($user = $this->provider->retrieveById($id)) {
$this->fireAuthenticatedEvent($user);
}
}
// If the user is null, but we decrypt a "recaller" cookie we can attempt to
// pull the user data on that cookie which serves as a remember cookie on
// the application. Once we have a user we can return it to the caller.
$recaller = $this->getRecaller();
if (is_null($user) && ! is_null($recaller)) {
$user = $this->getUserByRecaller($recaller);
if ($user) {
$this->updateSession($user->getAuthIdentifier());
$this->fireLoginEvent($user, true);
}
}
return $this->user = $user;
}
//如果我们已经为当前请求检索了用户,我们可以立即将其返回。我们不想在每次调用此方法时获取用户数据,因为这将非常慢。
if (! is_null($this->user)) {
return $this->user;
}
因此,多次调用user()
不会多次调用数据库。
答案 1 :(得分:1)
您只能获得1个数据库请求,因此多次使用Auth :: user()不是问题。
我建议您使用Laravel Debugbar作为应用优化的最舒适方式。