Model::find只适用于单列键。你可以给它传递一个数组，但这只会让它查找多行。
您需要将两个where链接在一起来进行查询：

$report = Report::where('id', '=', $reportElement['id'])
                ->where('group_id', '=', $group->id)
                ->first();

你可以创建一个Trait MutiPrimaryKey，然后扩展getKey和find方法：1）在App\Classes\Database中创建以下文件MultiPrimaryKey.php

<?php

namespace App\Classes\Database;

use Illuminate\Database\Eloquent\Builder;

trait MultiPrimaryKey {

    protected function setKeysForSaveQuery(Builder $query)
    {
        $keys = $this->getKeyName();
        if(!is_array($keys)){
            return parent::setKeysForSaveQuery($query);
        }

        foreach($keys as $keyName){
            $query->where($keyName, '=', $this->getKeyForSaveQuery($keyName));
        }

        return $query;
    }

    protected function getKeyForSaveQuery($keyName = null)
    {
        if(is_null($keyName)){
            $keyName = $this->getKeyName();
        }

        if (isset($this->original[$keyName])) {
            return $this->original[$keyName];
        }

        return $this->getAttribute($keyName);
    }

    public function getKey()
    {
        $keys = $this->getKeyName();
        if(!is_array($keys)){
            return parent::getKey();
        }

        $pk = [];

        foreach($keys as $keyName){
            $pk[$keyName] = $this->getAttribute($keyName);
        }

        return $pk;
    }

    public function find($id, $columns = ['*'])
    {
        if (is_array($id) || $id instanceof Arrayable) {
            $out = null;
            foreach ($id as $key => $value) {
                //echo "{$key} => {$value} ";
                if ($out == null)
                {
                    $out = $this->where($key, $value);
                }
                else
                {
                    $out = $out->where($key, $value);
                }
            }

            return $out->first($columns);
        }

        return $this->whereKey($id)->first($columns);
    }

}

然后你必须为自定义关系分类：2）在App\Classes\Database中创建以下文件HasMultiPKpage.php

<?php

namespace App\Classes\Database;

use App\Classes\Database\Eloquent\Relations\BelongsToMultiPK;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

trait HasMultiPKRelationships {

    public function belongsTo($related, $foreignKey = null, $ownerKey = null, $relation = null)
    {
        if ($relation === null) {
            $relation = $this->guessBelongsToRelation();
        }

        $instance = $this->newRelatedInstance($related);

        if ($foreignKey === null) {
            $foreignKey = Str::snake($relation) . '_' . $instance->getKeyName();
        }

        $ownerKey = $ownerKey ?: $instance->getKeyName();

        if ( is_array($ownerKey))
        {
            return new BelongsToMultiPK($instance->newQuery(), $this, $foreignKey, $ownerKey, $relation);
        }
        else
        {
            return new BelongsTo($instance->newQuery(), $this, $foreignKey, $ownerKey, $relation);
        }
    }
}

然后你需要自定义的BelongsTo 3）在App\Classes\Database\Eloquent\Relations中创建以下文件BelongsToMultiPK.php

<?php

namespace App\Classes\Database\Eloquent\Relations;

use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Database\Eloquent\Relations\Concerns\SupportsDefaultModels;

class BelongsToMultiPK extends BelongsTo
{

    public function __construct(Builder $query, Model $child, $foreignKey, $ownerKey, $relation)
    {
        parent::__construct($query, $child, $foreignKey, $ownerKey, $relation);
    }

    public function addConstraints()
    {
        if (static::$constraints) {
            // For belongs to relationships, which are essentially the inverse of has one
            // or has many relationships, we need to actually query on the primary key
            // of the related models matching on the foreign key that's on a parent.
            $table = $this->related->getTable();

            if (! is_array($this->ownerKey) )
            {
                $this->query->where($table.'.'.$this->ownerKey, '=', $this->child->{$this->foreignKey});
            }
            else
            {
                foreach ($this->ownerKey as $key)
                {
                    $this->query->where($table.'.'.$key, '=', $this->child->{$this->foreignKey}[$key]);
                }
            }                   
        }
    }
}

我知道这是一个老职位，但这里是我如何处理它使用本地范围查询
1-在Model中：

use Illuminate\Database\Eloquent\Builder;

  public function scopeComposited(Builder $q, $id, $group_id)
  {
    $q->where(["id" => $id, "group_id" => $groupo_id]);
  }

2-要检索模型，请执行以下操作：

Report::composited(1,2)->first();