Laravel Eloquent Eager Loading 是一种优化数据库查询的方法,可以避免在一个循环中多次查询数据库而导致的性能问题。 当需要获取一个模型及其关联模型的数据时,如果使用常规的查询方法,每个关联模型都会独立执行一条数据库查询,从而导致数据库查询次数的增加和潜在的性能问题。而使用 Eager Loading,则可以预先加载关联数据...
我们的编辑评论的最简单的功能做完了,下面我们看下如何为评论添加用户,我们先创建一个users的migration文件,默认安装laravel的时候都是有这个文件的,我们最初把它删除了,现在再来创建一下: php artisan make:migration create_users_table --create=users 编辑下这个文件的up()函数: public function up() { Schema...
标签: eager-loading Laravel 嵌套预加载并选择 当我尝试像这样嵌套的预加载时 $journal = Journal::with(['pages','pages.articles'])->select('id','titre','date')->findOrFail($id); Run Code Online (Sandbox Code Playgroud) 这是有效的,但是当我尝试为嵌套关系添加选择以仅获取如下所示的特定列时...
我是laravel的新手,并创建一个基本的应用程序来控制关系.我实现了一对一的关系,并希望从基表和相关表中获取特定的列.我有两个表,即users和identity_cards.Relationship定义如下 class User extends Eloquent implements UserInterface, RemindableInterface { use UserTrait, RemindableTrait; /** * The database tab...
This is typically done in the controller or repository layer. Since you're using API Platform, you might need to customize the query logic. Modify the API Resource Configuration: The extraProperties parameter is not natively supported by Laravel's Eloquent for eager loading. Instead, you should ...
Dealing with relations is very easy in Laravel, even when “eager loading” them. This is done using thewith()method, and every Laravel developers already know that. Nothing new again. The tip here is to reuse the samefunctionthat you used with thewhereHas()method with thewith()one. So ...
从本文的这一点开始,我将使用更多 Laravel 风格的术语,但仍然尽可能保持这个想法的一般性,所以我们开始吧!帖子 $table->increments('id'); $table->integer('comment_id')->unsigned(); $table->foreign('comment_id')->references('id')->on('comments'); 2. 评论 ...
[Laravel] Eager Loading + LIMIT を UNION ALL で実現する - Qiita <?php declare(strict_types=1); namespace App\Providers; use Illuminate\Database\Eloquent\Collection; use Illuminate\Database\Eloquent\Model; use Illuminate\Database\Eloquent\Relations\Relation; use Illuminate\Support\ServiceProvider;...
问如果后面跟着嵌套的'with‘，Laravel Eager加载内部约束是不受限制的EN最近有人问一个问题，就是它有...
Is there a way to provide that with laravel or do I have to create a completely own query? Thanks in advance Matthias Level 1 abergs Posted 8 years ago Is lazy loading a requirement? There might be other ways to access or refine the query if you load from the model directly. ...