如何在 Laravel 中查询具有精确指定关系的数据集？

Question

我有以下情况：

一个表 product_mappings 和一个表 product_mapping_options。我现在想查找所有product_mappings 中的所有条目，其中分配了具有特定ID 的条目product_mapping_options。例如，这可能如下所示：

      "data" => array:4 [
        0 => array:6 [
          "id" => 4
          "product_id" => 1
          "article_number" => null
          "created_at" => "2021-11-26T09:47:25.000000Z"
          "updated_at" => "2021-11-26T09:47:25.000000Z"
          "product_mapping_options" => array:3 [
            0 => array:5 [
              "id" => 4
              "product_mapping_id" => 4
              "product_option_id" => 1
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
            1 => array:5 [
              "id" => 5
              "product_mapping_id" => 4
              "product_option_id" => 3
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
            2 => array:5 [
              "id" => 6
              "product_mapping_id" => 4
              "product_option_id" => 5
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
          ]
        ]
        1 => array:6 [
          "id" => 5
          "product_id" => 1
          "article_number" => null
          "created_at" => "2021-11-26T09:47:25.000000Z"
          "updated_at" => "2021-11-26T09:47:25.000000Z"
          "product_mapping_options" => array:4 [
            0 => array:5 [
              "id" => 7
              "product_mapping_id" => 5
              "product_option_id" => 1
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
            1 => array:5 [
              "id" => 8
              "product_mapping_id" => 5
              "product_option_id" => 3
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
            2 => array:5 [
              "id" => 9
              "product_mapping_id" => 5
              "product_option_id" => 5
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
            3 => array:5 [
              "id" => 10
              "product_mapping_id" => 5
              "product_option_id" => 7
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
          ]
        ]
        2 => array:6 [
          "id" => 6
          "product_id" => 1
          "article_number" => null
          "created_at" => "2021-11-26T09:47:25.000000Z"
          "updated_at" => "2021-11-26T09:47:25.000000Z"
          "product_mapping_options" => array:4 [
            0 => array:5 [
              "id" => 11
              "product_mapping_id" => 6
              "product_option_id" => 1
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
            1 => array:5 [
              "id" => 12
              "product_mapping_id" => 6
              "product_option_id" => 3
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
            2 => array:5 [
              "id" => 13
              "product_mapping_id" => 6
              "product_option_id" => 5
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
            3 => array:5 [
              "id" => 14
              "product_mapping_id" => 6
              "product_option_id" => 8
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
          ]
        ]
        3 => array:6 [
          "id" => 7
          "product_id" => 1
          "article_number" => null
          "created_at" => "2021-11-26T09:47:25.000000Z"
          "updated_at" => "2021-11-26T09:47:25.000000Z"
          "product_mapping_options" => array:4 [
            0 => array:5 [
              "id" => 15
              "product_mapping_id" => 7
              "product_option_id" => 1
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
            1 => array:5 [
              "id" => 16
              "product_mapping_id" => 7
              "product_option_id" => 3
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
            2 => array:5 [
              "id" => 17
              "product_mapping_id" => 7
              "product_option_id" => 5
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
            3 => array:5 [
              "id" => 18
              "product_mapping_id" => 7
              "product_option_id" => 9
              "created_at" => "2021-11-26T09:47:25.000000Z"
              "updated_at" => "2021-11-26T09:47:25.000000Z"
            ]
          ]
        ]
      ]

这里我通过product_mappings搜索，搜索范围如下：

    public function scopeProductOption(Builder $query, ...$productOptionTypeIds): Builder
    {
        foreach($productOptionTypeIds as $productOptionTypeId) {
            $query->whereHas('ProductMappingOptions', function (Builder $query) use ($productOptionTypeId) {
                $query->where('product_option_id', $productOptionTypeId);
            });
        }

        return($query);
    }

在示例中，我指定了值 1,3 和 5（然后将其传递到 $productOptionTypeIds）。

我现在想要什么：我想要 100% 准确地显示 product_mappings 匹配搜索，比如说我想要找到例如只有一个条目恰好映射了 1,3 和 5，而不是 1,3,5 和 7,9 或 11。因此，具有 4 个关系的条目应该消失，因为我不希望条目在某事“结束”了。

你知道我怎样才能“抓住”这个条目吗？所以在上面的例子中，我只想要来自data 的条目0。如果我指定 1、3、5 和 9，我只想要来自 data 的条目 3。

Answer 1

好的，找到了解决方案，真的很简单：

    public function scopeProductOption(Builder $query, ...$productOptionTypeIds): Builder
    {
        $query->has('ProductMappingOptions', '=', count($productOptionTypeIds));
        foreach($productOptionTypeIds as $productOptionTypeId) {
            $query->whereHas('ProductMappingOptions', function (Builder $query) use ($productOptionTypeId) {
                $query->where('product_option_id', $productOptionTypeId);
            });
        }

        return($query);
    }

我添加了关系计数

Answer 2

你可以使用whereIn函数来代替循环语句

public function scopeProductOption(Builder $query, ...$productOptionTypeIds): Builder
    {
        //this will parse the values from spread operator
        if ($productOptionTypeIds !== []) {
            if (count($productOptionTypeIds) !== count($productOptionTypeIds, COUNT_RECURSIVE)) {
                $productOptionTypeIds = iterator_to_array(new \RecursiveIteratorIterator(new \RecursiveArrayIterator($productOptionTypeIds)));
            }

            $query->whereHas('ProductMappingOptions', function (Builder $query) use ($productOptionTypeIds) {
                $query->where('product_option_id', $productOptionTypeIds);
            });
        }
    
        return ($query);
    }