Laravel Eloquent Query Builder 链接会影响原始基本查询 [重复]

Question

我怎样才能让这个查询工作？

$basic_query = Invoices::between_days(15, 7); // This is a collection of invoices from 15 days ago, to seven days in the future. Notice I am not getting this query, it´s still just a builder instance. If you do dd($basic_query->get()) you get 100 invoices, 60 of them paid, 40 of them outstanding.

$paid_invoices = $basic_query->paid()->get(); // This returns the collection of 60 paid invoices without problems. BUT MODIFIES $basic query, if you dd($basic query->get()) at this point, you only get the 60 paid invoices, not the full 100 invoices collection. ¿?!!!

$outstanding_invoices = $basic_query->paid(false)->get(); // This query will always be empty, even though there are many outstanding invoices. If you dd($basic_query->get()) at this point, you get an empty collection. The 100 invoices are lost.

那么，我怎样才能有一个基本集合作为起点，不会被后续的 get() 操作修改。

谢谢！

Answer 1

如果您有一个构建器并且您想要一个构建器的新副本以便您可以继续从中构建查询，您可以“克隆”该构建器：

$cloned = clone $query;

现在$cloned 是它自己的对象，您可以按照自己的方式构建查询，而不会影响原始构建器$query。

如果您真的想要构建器上的 clone 方法并且它不存在，您可以对其进行宏处理：

Illuminate\Database\Query\Builder::macro('clone', function () {
    return clone $this;
});

您可以将其放入服务提供者的 boot 方法中。

Answer 2

构建器上有一个可用的克隆方法（Illuminate\Database\Query\Builder） 哪个可以用

$basic_query = Invoices::between_days(15, 7);

$paid_invoices = $basic_query->clone()->paid()->get();

$outstanding_invoices = $basic_query->clone()->paid(false)->get();

更新

对于低于 8.x 的 Laravel 版本，可以在 AppServiceProvider 或新的 MacroServiceProvider 中定义宏 - 启动方法。

使用 MacroServiceProvider - 不要忘记将其添加到 config/app.php 中的 providers 数组中

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Illuminate\Database\Query\Builder;

class MacroServiceProvider extends ServiceProvider
{
    public function boot()
    {
        Builder::macro('clone', function() {
            return clone $this;
        });
    }

    public function register()
    {
        //
    }
}