[英]Laravel Eloquent get specific relationship
I'm trying to get the books where the authors are from a specific country, for now my query looks like this : 我正在尝试从特定国家/地区获取作者所在的图书,目前,我的查询如下所示:
$books->with('author')->where('country', '=', 'FR');
but the where is applied to books and not to authors 但在哪里适用于书籍而不是作者
any help ? 有什么帮助吗?
You need to use whereHas() for that. 您需要为此使用whereHas() 。 The following code should do the trick:
以下代码可以解决问题:
$country = 'FR';
$books = Book::with('author')->whereHas('author', function($query) use ($country) {
$query->where('country', '=', $country);
})->get();
This will give you all books that have a related author, that has country column set to FR . 这将为您提供所有具有相关作者的书,并且“ 国家/地区”列设置为FR 。
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