我有一个包含以下表格和关系的数据库:
I have a database with the following tables and relationships:
广告1-1 汽车m-1 车型m-1 品牌
Advert 1-1 Car m-1 Model m-1 Brand
如果我想检索一个广告,我可以简单地使用:
If I want to retrieve an Advert, I can simply use:
Advert::find(1);
如果我想要汽车的详细信息,我可以使用:
If I want the details of the car, I could use:
Advert::find(1)->with('Car');
但是,如果我还想要模型的细节(遵循与汽车的关系),语法是什么,以下不起作用:
However, if I also want the detail of the Model (following the relationship with Car), what would the syntax be, the following doesn't work:
Advert::find(1)->with('Car')->with('Model');
非常感谢
在官方 文档 下急切加载"
It's in the official documentation under "Eager Loading"
多重关系:
$books = Book::with('author', 'publisher')->get();
嵌套关系:
$books = Book::with('author.contacts')->get();
所以对你来说:
Advert::with('Car.Model')->find(1);
这篇关于在 Laravel 中使用 Eloquent 检索关系的关系的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持html5模板网!
PHP、MySQL PDOException 的死锁异常代码?Deadlock exception code for PHP, MySQL PDOException?(PHP、MySQL PDOException 的死锁异常代码?)
PHP PDO MySQL 可滚动游标不起作用PHP PDO MySQL scrollable cursor doesn#39;t work(PHP PDO MySQL 可滚动游标不起作用)
PHP PDO ODBC 连接PHP PDO ODBC connection(PHP PDO ODBC 连接)
使用 PDO::FETCH_CLASS 和魔术方法Using PDO::FETCH_CLASS with Magic Methods(使用 PDO::FETCH_CLASS 和魔术方法)
php pdo 只从 mysql 获取一个值;等于变量的值php pdo get only one value from mysql; value that equals to variable(php pdo 只从 mysql 获取一个值;等于变量的值)
MSSQL PDO 找不到驱动程序MSSQL PDO could not find driver(MSSQL PDO 找不到驱动程序)