Php Laravel有许多关系自定义选择结果为空

我有表格、用户、个人资料和联系人。1个用户有1个配置文件，1个配置文件有多个联系人，我想获取带有筛选联系人和选定列的配置文件（我不想获取所有列）。我在下面成功地编写了代码

UserController.php

$profile = $user->with(['profile.emails', 'profile.phones'])->first();

public function profile()
{
    return $this->hasOne(Profile::class);
}

public function emails()
{
    return $this->hasMany(Contact::class)
        ->where('type', 'email');
}

public function phones()
{
    return $this->hasMany(Contact::class)
        ->where('type', 'phone');
}

User.php

$profile = $user->with(['profile.emails', 'profile.phones'])->first();

public function profile()
{
    return $this->hasOne(Profile::class);
}

public function emails()
{
    return $this->hasMany(Contact::class)
        ->where('type', 'email');
}

public function phones()
{
    return $this->hasMany(Contact::class)
        ->where('type', 'phone');
}

Profile.php

$profile = $user->with(['profile.emails', 'profile.phones'])->first();

public function profile()
{
    return $this->hasOne(Profile::class);
}

public function emails()
{
    return $this->hasMany(Contact::class)
        ->where('type', 'email');
}

public function phones()
{
    return $this->hasMany(Contact::class)
        ->where('type', 'phone');
}

像这样的结果数据

{
    "username": "user",
    "email": "user@mail.com",
    "profile": {
        "first_name": "Alex",
        "last_name": "Ariana",
        "emails": [
            {
                "id": 1,
                "profile_id": 1,
                "type": "email",
                "prefix": "Personal",
                "value": "alex@mail.com",
                "is_primary": 0,
            },
            {
                "id": 2,
                "profile_id": 1,
                "type": "email",
                "prefix": "Business",
                "value": "business@mail.com",
                "is_primary": 1,
            }
        ],
        "phones": [
            {
                "id": 3,
                "profile_id": 1,
                "type": "phone",
                "prefix": "45",
                "value": "564637345345",
                "is_primary": 1,
            }
        ]
    }
}

    public function emails()
    {
        return $this->hasMany(Contact::class)
            ->select([DB::raw('IFNULL(prefix, "Email") AS type'), 'value AS url', 'is_primary'])
            ->where('type', 'email');
    }

    public function phones()
    {
        return $this->hasMany(Contact::class)
            ->select(['prefix', 'value AS number', 'is_primary'])
            ->where('type', 'phone');
    }

然后我在关系上加上select，如下所示

{
    "username": "user",
    "email": "user@mail.com",
    "profile": {
        "first_name": "Alex",
        "last_name": "Ariana",
        "emails": [
            {
                "id": 1,
                "profile_id": 1,
                "type": "email",
                "prefix": "Personal",
                "value": "alex@mail.com",
                "is_primary": 0,
            },
            {
                "id": 2,
                "profile_id": 1,
                "type": "email",
                "prefix": "Business",
                "value": "business@mail.com",
                "is_primary": 1,
            }
        ],
        "phones": [
            {
                "id": 3,
                "profile_id": 1,
                "type": "phone",
                "prefix": "45",
                "value": "564637345345",
                "is_primary": 1,
            }
        ]
    }
}

    public function emails()
    {
        return $this->hasMany(Contact::class)
            ->select([DB::raw('IFNULL(prefix, "Email") AS type'), 'value AS url', 'is_primary'])
            ->where('type', 'email');
    }

    public function phones()
    {
        return $this->hasMany(Contact::class)
            ->select(['prefix', 'value AS number', 'is_primary'])
            ->where('type', 'phone');
    }

然后我得到了像这样的空联系人数据 {

}

---

为什么会发生这种情况？如果我通过

hasManyThrough

从用户处访问，它会工作，但当我使用

hasMany

时，结果是空的。

您必须选择关系所需的任何外键，否则它无法将子项与父项匹配，根据关系，您可能需要“id”字段才能匹配记录upok，但为什么在

hasManyThrough

中没有显示问题，不同的只是关系方法外键，您需要将它们链接到其父项的外键在用户的

profile（）

关系中是否有自定义选择？如果是，您应该将

id

列添加到selects。我添加了profile\u id，它可以工作，谢谢，但是当我通过用户模型使用hasManyThrough访问时，我只能选择我想要的列（没有profile\u id或id），为什么？