如何从具有来自三个表的ID的数据透视表中获取数据

Question

我有三个表呼叫用户，服务，类别和数据透视表呼叫专业人员。 还有所有表的四个模型。

User: Id, name
Services: id, service_name
Categories: id, service_id, category_name
Professionals: id, user_id, service_id, category_id

Relationships
User has many Categories
Service has many categories
category can have one service
category belongs to many users

$result = Professional::where('user_id’,’=‘,54)->get();

以上命令给出如下数据：

{
    "id": 1,
    "user_id": 54,
    "service_id": 8,
    "category_id": 20
},
{
    "id": 2,
    "user_id": 54,
    "service_id": 10,
    "category_id": 23
},
{
    "id": 3,
    "user_id": 54,
    "service_id": 9,
    "category_id": 21
},
{
    "id": 4,
    "user_id": 54,
    "service_id": 10,
    "category_id": 22
}

请帮助我从“专家”表中获取与用户相关的类别和服务详细信息的数据，指导我如何在模型上建立关系