Laravel - 通過 Pivot 表訪問、操作和循環

Question

我有兩個表， users和like_categories具有many-to-many關系。 pivot table稱為like_category_user 。 將兩個用戶數據插入db后，這是我的pivot table ，如下所示： https://i.imgur.com/MeeRbiV.png

我想為每個user計算每個不同的同類category的amount ，並將其存儲在object array中，如下所示：

[
    {
        "User Id": 1,
        "Like Categories": [
            {
                "Category": "Chinese Restaurant"
                "Amount": 1
            },
            {
                "Category": "Korean Restaurant"
                "Amount": 2
            },
            {
                "Category": "Fast Food Restaurant"
                "Amount": 3
            },
            {
                "Category": "Italian Restaurant"
                "Amount": 1
            },
            {
                "Category": "Steakhouse Restaurant"
                "Amount": 3
            }
        ]
    },
    {
        "User Id": 2,
        "Like Categories": [
            {
                "Category": "Thai Restaurant"
                "Amount": 1
            },
            {
                "Category": "Kebab Shop"
                "Amount": 3
            },
            {
                "Category": "Pizza Place"
                "Amount": 2
            },
            {
                "Category": "Steakhouse"
                "Amount": 1
            }
        }
    }
]

我試圖將數據庫中的數據存儲到基於上述格式的 object 數組中。 但是 output 並不是我想要的樣子。 我的代碼：

public function showUserLikesData() {

        $users = User::all();

        $counter = 0;
        $countUser = 0;
        $countThatCategory = 0;
        $categoryName = '';

        foreach($users as $user) {

            $userLikesData[$countUser]['User Id'] = $user->id;

            foreach ($user->likeCategories as $likeCategory) {

                 $categoryName = $likeCategory->pivot->category_name;

                foreach ($user->likeCategories as $likeCategory) {
                    $checkCategoryName = $likeCategory->pivot->category_name;

                    if ($categoryName == $checkCategoryName) {
                           $countThatCategory++;
                    }
                }

                $userLikesData[$countUser]['Like Categories'][$counter]['Category'] = $categoryName;
                $userLikesData[$countUser]['Like Categories'][$counter]['Amount'] = $countThatCategory;

                $countThatCategory = 0;

                $counter++;
            }
            $countUser++;
            $counter=0;
        }

        return $userLikesData;
    }

我得到的object array ：

[
    {
        "User Id": 1,
        "Like Categories": [
            {
                "Category": "Chinese Restaurant",
                "Amount": 1
            },
            {
                "Category": "Korean Restaurant",
                "Amount": 2
            },
            {
                "Category": "Korean Restaurant",
                "Amount": 2
            },
            {
                "Category": "Fast Food Restaurant",
                "Amount": 3
            },
            {
                "Category": "Fast Food Restaurant",
                "Amount": 3
            },
            {
                "Category": "Fast Food Restaurant",
                "Amount": 3
            },
            {
                "Category": "Italian Restaurant",
                "Amount": 1
            },
            {
                "Category": "Steakhouse",
                "Amount": 3
            },
            {
                "Category": "Steakhouse",
                "Amount": 3
            },
            {
                "Category": "Steakhouse",
                "Amount": 3
            }
        ]
    },
    {
        "User Id": 2,
        "Like Categories": [
            {
                "Category": "Thai Restaurant",
                "Amount": 1
            },
            {
                "Category": "Kebab Shop",
                "Amount": 3
            },
            {
                "Category": "Kebab Shop",
                "Amount": 3
            },
            {
                "Category": "Kebab Shop",
                "Amount": 3
            },
            {
                "Category": "Pizza Place",
                "Amount": 2
            },
            {
                "Category": "Pizza Place",
                "Amount": 2
            },
            {
                "Category": "Steakhouse",
                "Amount": 1
            }
        ]
    }
]

Answer 1

如果您需要相同的 output 只需更換這個

$users = User::all();

至

$users = User::all()->toArray();