Laravel 8 多对多更改自定义属性的 id

Question

我在Faculties 和Departments 之间创建了关系many-to-many（我正在处理原型时间表问题）。对于请愿，这些表格需要验证码vcode。问题出在这个关系上，我不知道为什么这个关系只识别 id's 表的雄辩查询而不是 vcode。

附上我的迁移和模型关系。

移民系表

public function up()
{
    Schema::create('faculties', function (Blueprint $table) {
        $table->id();
        $table->unsignedBigInteger('vcode')->index()->unique();
        $table->string('code');
        $table->string('name');
        $table->string('website');
        $table->string('email');
        $table->string('phone');
        $table->timestamps();
    });
}

教师模型的关系店

public function departments()
{
    return $this->belongsToMany(Department::class, 'faculty_departments','faculty_vcode','department_vcode');
} 

移民部门表

public function up()
{
    Schema::create('departments', function (Blueprint $table) {
        $table->id();
        $table->unsignedBigInteger('vcode')->index()->unique();
        $table->string('code');
        $table->string('name');
        $table->string('phone');
        $table->string('email');
        $table->string('website');
        $table->timestamps();
    });
}

部门模型的关系商店

public function faculties()
{
    return $this->belongsToMany(Faculty::class, 'faculty_departments', 'department_vcode','faculty_vcode',);
}

Migration FacultyDepartments（关系）

public function up()
{
    Schema::create('faculty_departments', function (Blueprint $table) {
        $table->id();
        $table->unsignedBigInteger('faculty_vcode')->nullable()->index();
        $table->foreign('faculty_vcode')
              ->references('vcode')
              ->on('faculties')
              ->cascadeOnUpdate()
              ->nullOnDelete();
        $table->unsignedBigInteger('department_vcode')->nullable()->index();
        $table->foreign('department_vcode')
              ->references('vcode')
              ->on('departments')
              ->cascadeOnUpdate()
              ->nullOnDelete();
        $table->timestamps();
    });
}

我在获取查询时引发错误并测试了错误（获取 id´s 表）。

faculty::with('departments')->get() 给我：

select `departments`.*, `faculty_departments`.`faculty_vcode` as `pivot_faculty_vcode`, `faculty_departments`.`department_vcode` as `pivot_department_vcode` 
from `departments` 
inner join `faculty_departments` on `departments`.`id` = `faculty_departments`.`department_vcode` 
 
where `faculty_departments`.`faculty_vcode` in (1, 2, 3, 4, 5, 6, 7)

Answer 1

由于您没有为 faculties 表或 departments 表提供字段名称，Laravel 将假定它是这些表的主键 (id)。

您需要将 belongsToMany 方法更新为：

public function departments()
{
    return $this->belongsToMany(
        Department::class,      // The related model
        'faculty_departments',  // The intermediate (pivot) table name
        'faculty_vcode',        // The pivot field relating to faculties
        'department_vcode',     // The pivot field relating to departments
        'vcode',                // The field on the faculties table
        'vcode',                // The field on the departments table
    );
}