Laravel：使用口才加入查詢

Question

我有五個表，我需要從這些表中獲取數據。 post,product,categories,attributes,post_attribute

我的模型中有一個查詢，該查詢收集一個產品的所有帖子，並且包含類別和屬性詳細信息。 查詢：

 Post::with(['product.categories.attributes'])->whereStatus("Active")->get();

響應：

 "PostDetails": [
    {
        "id": 153,
        "user_id": 3,
        "product_id": 1,
        "demand_or_supply": "Demand",
        "description": "This is a post description three",
        "image_one": null,
        "image_two": null,
        "image_three": null,
        "image_four": null,
        "status": "Active",
        "created_at": "2018-05-07 09:51:08",
        "updated_at": "2018-05-07 09:51:08",
        "product": {
            "id": 1,
            "title": "Diamond",
            "icon": null,
            "status": "Active",
            "created_at": "2018-04-27 18:46:28",
            "updated_at": "2018-04-27 18:46:28",
            "categories": [
                {
                    "id": 1,
                    "product_id": 1,
                    "title": "Shape",
                    "status": "Active",
                    "sort_order": 1,
                    "created_at": "2018-04-27 18:46:28",
                    "updated_at": "2018-04-27 18:46:28",
                    "attributes": [
                        {
                            "id": 1,
                            "product_id": 1,
                            "category_id": 1,
                            "parent_id": null,
                            "title": "Round",
                            "status": "Active",
                            "sort_order": 2,
                            "created_at": "2018-04-27 18:46:29",
                            "updated_at": "2018-04-27 18:46:29"
                        },
                        {
                            "id": 2,
                            "product_id": 1,
                            "category_id": 1,
                            "parent_id": null,
                            "title": "Princess",
                            "status": "Active",
                            "sort_order": 1,
                            "created_at": "2018-04-27 18:46:29",
                            "updated_at": "2018-04-27 18:46:29"
                        },
                        {
                            "id": 3,
                            "product_id": 1,
                            "category_id": 1,
                            "parent_id": null,
                            "title": "Oval",
                            "status": "Active",
                            "sort_order": 3,
                            "created_at": "2018-04-27 18:46:29",
                            "updated_at": "2018-04-27 18:46:29"
                        },
                        {
                            "id": 4,
                            "product_id": 1,
                            "category_id": 1,
                            "parent_id": null,
                            "title": "Kite",
                            "status": "Active",
                            "sort_order": 8,
                            "created_at": "2018-04-27 18:46:29",
                            "updated_at": "2018-04-27 18:46:29"
                        },
                        {
                            "id": 5,
                            "product_id": 1,
                            "category_id": 1,
                            "parent_id": null,
                            "title": "1-5",
                            "status": "Active",
                            "sort_order": 4,
                            "created_at": "2018-04-27 18:46:29",
                            "updated_at": "2018-04-27 18:46:29"
                        },
                        {
                            "id": 6,
                            "product_id": 1,
                            "category_id": 1,
                            "parent_id": null,
                            "title": "6-10",
                            "status": "Active",
                            "sort_order": 9,
                            "created_at": "2018-04-27 18:46:29",
                            "updated_at": "2018-04-27 18:46:29"
                        },
                        {
                            "id": 8,
                            "product_id": 1,
                            "category_id": 1,
                            "parent_id": null,
                            "title": "-2",
                            "status": "Active",
                            "sort_order": 10,
                            "created_at": "2018-04-27 18:46:29",
                            "updated_at": "2018-04-27 18:46:29"
                        },
                        {
                            "id": 9,
                            "product_id": 1,
                            "category_id": 1,
                            "parent_id": null,
                            "title": "+2 -4",
                            "status": "Active",
                            "sort_order": 7,
                            "created_at": "2018-04-27 18:46:29",
                            "updated_at": "2018-04-27 18:46:29"
                        },
                        {
                            "id": 10,
                            "product_id": 1,
                            "category_id": 1,
                            "parent_id": null,
                            "title": "+4 -6 1/2",
                            "status": "Active",
                            "sort_order": 6,
                            "created_at": "2018-04-27 18:46:29",
                            "updated_at": "2018-04-27 18:46:29"
                        }
                    ]
                },

在該表中還有另一個名為post_attributes的表，我存儲了屬於attribute和product表的attribute_id和product_id 。

我想過濾僅在post_attributes表中可用的attributes數據，以及僅對在post_attributes中具有product_id和attribute_id可用的'product'的attribute_id 。 我怎樣才能做到這一點 ？

Answer 1

要約束緊急加載關系，您可以將閉包傳遞給whereHas加載查詢，並且可以使用whereHas函數來查詢關系，因此它看起來像這樣：

Post::with(['product.categories.attributes' => function($query) {
    // Eager load constraint
    $query->whereHas('post_attribute', function ($query) {
        $query->where('product_id', 1); // Filter by the joined data
    });
}])->whereStatus("Active")->get();

希望這對您有所幫助。