将条件参数传递给幼虫的急切加载错误结束 [英] Passing conditional param to Eager Loading in larave ends with error

问题描述

我的代码如下:

   return User::whereHas('roles', function ($role, $query) {
            return $role;
            $query->whereId($role);
        })->get();

我正在尝试将此处的角色ID传递给查询生成器.

what I am trying is to pass role id here to query builder.

它最终出现以下错误:

Symfony\Component\Debug\Exception\FatalThrowableError
Too few arguments to function App\Http\Controllers\UserController::App\Http\Controllers\{closure}(), 1 passed in /Users/x/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php on line 962 and exactly 2 expected 

推荐答案

我认为这是您想要的:

闭包是在其自己的环境中评估的函数，该函数具有一个或多个绑定变量，调用该函数时可以访问它们.

A closure is a function that is evaluated in its own environment, which has one or more bound variables that can be accessed when the function is called.

通过use()关键字，您从函数环境外部的函数内部导入变量.

return User::whereHas('roles', function ($query) use ($role) {
    return $query->whereId($role);
})->get();

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