So if you selected columns without the foreign_key in a closure, the relationship result will be empty: Order::with(['orderItems' => function($query) { // $query->sum('quantity'); $query->select('quantity'); // without `order_id` } ])->get(); #=> result: [{ id: 1,...
具体来说,通过追加模型添加查询结果是通过在模型类中定义访问器(accessor)或关联关系(relationship)来实现的。访问器允许我们在模型中定义一个方法,该方法将返回我们想要追加到查询结果中的数据。关联关系则允许我们在模型之间建立关联,并通过关联关系方法来获取相关模型的数据。 通过追加模型添加查询结果的优势在于可以轻松...
However, use caution when chaining orWhere clauses onto a relationship, as the orWhere clauses will be logically grouped at the same level as the relationship constraint:$user->posts() ->where('active', 1) ->orWhere('votes', '>=', 100) ->get(); // select * from posts // where...
However, use caution when chaining orWhere clauses onto a relationship, as the orWhere clauses will be logically grouped at the same level as the relationship constraint:$user->posts() ->where('active', 1) ->orWhere('votes', '>=', 100) ->get(); // select * from posts // where...
DB::table('categories') ->join('subcategories','categories.id','=','subcategories.category_id') ->where('subcategories.status',true) ->get(); I don't tested. OR Category::select("categories.*, subcategories.*") ->join("subcategories","subcategories.category_id","=","categories.id") ...
$users = User::with('hasOneAccount')->take(10)->get() 这样生成的 SQL 就是这个样子的: select * from account where id in (1, 2, 3, ... ...) 这样1 + 10 条 SQL 就变成了 1 + 1 条,性能大增。 至此,深入理解 Laravel Eloquent 系列文章到此结束。推荐继续了解软删除、转换成数组/JSO...
Laravel Version: 6.6.2 PHP Version: 7.2.19 Laravel-admin: 1.7 Description: In model form for News resource I want to have select field to be able to change category of every news. protected function detail($id) { $show = new Show(News::f...
select * from `users` where `age` > 200 Anonymous Global Scopes Eloquent also allows you to define global scopes using Closures, which is particularly useful for simple scopes that do not warrant a separate class: <?php namespace App; ...
select * from users where id = 1 select * from phones where user_id = 1注意, Eloquent 假设对应的关联模型数据库表里,外键名称是基于模型名称。在这个例子里,默认Phone 模型数据库表会以user_id 作为外键。如果想要更改这个默认,可以传入第二个参数到hasOne 方法里。更进一步,您可以传入第三个参数,指定...
在Eloquent 查询中使用 select 可以设置查询的字段,然后你可以通过 "as" 给字段重命名为你想要的名称: $users=DB::table('users')->select('name','email as user_email')->get(); 查询结果的 Map 处理 由于Eloquent 中,get 方法将返回 Collection 类型的数据,所以在通过 get 方法获取数据之后,你可以直接...