Laravel Eloquent - 最后相当于 first() 吗？
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Laravel Eloquent - equivalent to first() for last?
提问by StackOverflowed
I have a few models such as User, Post, Comment, etc.
我有一些模型，例如用户、帖子、评论等。
In the User, I have:
在用户中，我有：
public function posts()
{
return $this->hasMany('Post');
}
I can get the first post via $customer->posts()->first(), but what if I want to get the latest Post? There is no last() as I can see.
我可以通过 获得第一篇文章$customer->posts()->first()，但是如果我想获得最新的文章怎么办？正如我所见，没有 last() 。
This is further compounded by a hasManyThrough relationship (unfortunately we inherited a wacky schema):
hasManyThrough 关系进一步加剧了这种情况（不幸的是，我们继承了一个古怪的模式）：
public function comments()
{
return $this->hasManyThrough('Comment', 'Post');
}
If I try to do an $this->comments()->orderBy('comments.id', 'desc')->first();it returns a User object??
如果我尝试执行$this->comments()->orderBy('comments.id', 'desc')->first();它返回一个用户对象？
回答by Jarek Tkaczyk
No, this
没有这个
// User model
$this->comments()->orderBy('comments.id', 'desc')->first();
won't return Usermodel.
不会返回User模型。
And to get what you asked for, simply do this:
要获得您所要求的，只需执行以下操作：
$customer->posts()->latest()->first();
回答by The Alpha
You said There is no last() as I can see, but actually there is a last()method available as well, so you can use it like:
您说There is no last() as I can see，但实际上也有一种last()方法可用，因此您可以像这样使用它：
$customer->posts->last();
Notice that, it's not $customer->posts()->last()like you've used in your example using first().
请注意，这$customer->posts()->last()与您在示例中使用的first().
