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php - 如何使用 Eloquent ORM 进行多重连接查询

问题描述

长话短说，如何使用 Eloquent ORM 方法执行下一个 MySql 查询？

Ps：我想使用多重连接选项而不是我知道Eloquent ORM在幕后执行的多重选择或子查询，我不知道是否有可能，以提高数据库性能

select t.*,
       d.name,
       tt.name
from template t
         inner join template_type tt on t.id_template_type = tt.id_template_type
         inner join department d on t.id_department = d.id_department
         inner join user_department ud on d.id_department = ud.id_department
         inner join `user` u on ud.id_user = u.id_user
where u.id_user = 1;

模板表

| id_template | name    | id_department | id_template_type | content       |
|-------------|---------|---------------|------------------|---------------|
| 1           | temp 14 | 1             | 1                | some content  |
| 2           | temp 25 | 2             | 3                | other content |

模板类型表

| id_template_type | name       | active |
|------------------|------------|--------|
| 1                | my type    | 1      |
| 2                | elses type | 1      |

部门表

| id_department | name         | active |
|---------------|--------------|--------|
| 1             | my dept      | 1      |
| 2             | another dept | 1      |

数据透视表部门用户

| id_user_department | id_user | id_department |
|--------------------|---------|---------------|
| 1                  | 2       | 1             |
| 2                  | 6       | 2             |
| 3                  | 6       | 3             |

用户表

| id_user | name         |
|---------|--------------|
| 1       | My User      |
| 2       | Another User |

模板类

class Template extends Model
{
    protected $primaryKey = 'id_template';

    protected $table = 'template';

    public function departments()
    {
        return $this->belongsTo(Department::class);
    }

    public function types()
    {
        return $this->belongsTo(TemplateType::class);
    }
}

模板类型类

class TemplateType extends Model
{
    protected $primaryKey = 'id_template_type';

    protected $table = 'template_type';

    public function templates()
    {
        $this->hasMany(Template::class, 'id_template_type', 'id_template_type');
    }
}

部门班

class Department extends Model
{
    protected $table = 'department';

    protected $primaryKey = 'id_department';

    public function users()
    {
        return $this->belongsToMany(Users::class, 'user_department', 'id_department', 'id_user');
    }
}

用户类

class User extends Model
{
    protected $table = 'user';

    protected $primaryKey = 'id_user';

    public function departments()
    {
        return $this->belongsToMany(Department::class, 'user_department', 'id_user', 'id_department');
    }
}

标签： phpmysqleloquentormeloquent-relationship

解决方案

如果你正确地建立了你们的关系。你可以这样做：

$templates = Template::with('type', 'department')
                     ->whereHas('department', function($query) use ($user_id) {
                         return $query->whereHas('users', function($user_query) use ($user_id) {
                             return $user_query->where('id', $id')
                         });
                     })

从部门到用户，这里应该是多对多

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