针对hasMany关系的Slim php / Eloquent自定义查询 [英] Slim php / Eloquent custom query for hasMany-relation

问题描述

我正在使用Slim php-framework和eloquent-database：
https://www.slimframework.com/docs/cookbook/database-eloquent.html

I'm currently working with Slim php-framework and eloquent-database: https://www.slimframework.com/docs/cookbook/database-eloquent.html

我想做的是使用一个自定义SQL查询来设置两个模型的hasMany关系。

What I want to do is to use a custom SQL-query to set up a hasMany-relation of two models.

我有两个模型User和Entry。

Let's say, I have two models "User" and "Entry".

我的User.php看起来像这样

My User.php looks like this

class User extends \Illuminate\Database\Eloquent\Model {
    protected $table = 'users';

    public function entries() {
        return $this->hasMany('foo\bar\Entry');
    }

}

要获取条目，我使用以下代码，其工作原理如下：

To fetch the entries I use the following code which works as expected.

$userentries = User::find(1)->entries

但是，我希望使用自定义SQL查询来获取条目，如

But, I'd like the entries to be fetched with a custom SQL-query like

SELECT e.user_id, e.colB, SUM(e.colC - e.colD) as foobar from entries as e where e.user_id = 1 group by e.colB order by foobar DESC;

而不是默认的 SELECT * from entry where user_id = 1; code>但仍保留与用户的条目属性相关联的条目模型。

instead of the default SELECT * from entries where user_id = 1; but still keep the Entry-model associated to the User's entries property. Is that possible?

推荐答案

嗯，找到一个干净的解决方案，它是selectRaw（）和雄辩的本地范围的组合： https://laravel.com/docs/5.4/eloquent#local-scopes

Well, found a clean solution which is a combination of selectRaw() and eloquent local scopes: https://laravel.com/docs/5.4/eloquent#local-scopes

我使用query（） - 查找功能，可能发生了什么使用这个

I played around with the query()-functions to find out, what's possible and came up with this one

Entry::query()->selectRaw("SUM(colC - colD) as foobar, colB")->where('user_id', 1)->groupBy('colB')->orderBy('foobar', 'DESC')->get();

使用这个关系：

Entry.php 模型看起来像这样：

to use this in a relation:

the Entry.php model looks like this:

class Entry extends \Illuminate\Database\Eloquent\Model {

    public function scopeCustom($query) {
        return $query->selectRaw("SUM(colC - colD) as foobar, colB")->groupBy('colB')->orderBy('foobar', 'DESC')->get();
    }
}

最后...

我可以通过以下方式调用它：

and finally...

I can call it with:

User::find(1)->entries()->custom();

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