调用模型 [App\Models\Municipal_district] 上的未定义关系 [城市]

Question

City.php

public function municipal_districts()
{
    return $this->hasMany('App\Models\Municipal_district');
}

Municipal_district.php

public function province()
{
    return $this->belongsTo('App\Models\City', 'city_id');
}

哪里会出错？

Answer 1

城市模式

public function municipal_districts()
{
    return $this->hasMany('App\Models\Municipal_district');
}

Municipal_district型号

public function city()
{
    return $this->belongsTo('App\Models\City', 'city_id');
}

而且我不知道这里的 cities() 关系！

市有多个区，区属于一个市。那么，这里的 cities() 是什么？

Call to undefined relationship [cities] on model [App\Models\Municipal_district]