Laravel Eloquent ORM"whereHas"通过表

Question

嘿,我和Laravel有问题.我尝试通过联系表选择有我选择的城市的地方.

我的模型类:Places类:

class Places extends Eloquent {
    public function contacts()
    {
        return $this->hasOne('Contacts');
    }
     public function clubs()
     {
        return $this->hasOne('Clubs');
     }    
}

联系人类:

 class Contacts extends Eloquent {
     public function cities()
     {
         return $this->hasOne('Cities');
     }
   }

城市类:

 class Cities extends Eloquent {

 }

我的查询:

$view->clubs = Places::whereHas('contacts',function ($q) use($city_id){
           $q->where('contacts', function ($q) use($city_id){
               $q->where('id', $city_id);
            });
        })->get();

错误消息:

MySQL服务器版本使用附近的正确的语法'其中id=))> = 1？'在1号线(SQL:SELECT*FROM places其中(SELECT COUNT(*)从contacts哪里contacts.places_id= places.id和contacts=(选择*其中id= 2223) )> = 1)

我知道它缺少"来自",citites但我不知道如何实现它.

Answer 1

您有3个使用关系的选项:

1最直接的解决方案:

Places::whereHas('contacts',function ($q) use ($city_id){
       $q->whereHas('cities', function ($q) use ($city_id){
           $q->where('id', $city_id);
        });
    })->get();

2与上述相同,但使用此PR:https://github.com/laravel/framework/pull/4954

Places::whereHas('contacts.cities', function ($q) use ($city_id){
        $q->where('id', $city_id);   
    })->get();

3使用hasManyThrough关系:

// Place model
public function cities()
{
  return $this->hasManyThrough('City', 'Contact');
}

// then
Places::whereHas('cities',function ($q) use ($city_id){
   $q->where('cities.id', $city_id);
})->get();

编辑

拥有您的架构显然没有任何建议或您的原始设置可以工作.

这是一个多对多关系,在Eloquent中是belongsToMany:

// Places model
public function cities()
{
  return $this->belongsToMany('Cities', 'contacts', 'places_id', 'cities_id')
    ->withPivot( .. contacts table fields that you need go here.. );
}

// Cities model
public function places()
{
  return $this->belongsToMany('Places', 'contacts', 'cities_id', 'places_id')
    ->withPivot( .. contacts table fields that you need go here.. );
}

然后你可以调用这样的关系:

$city = Cities::first();
$city->places; // collection of Places models

// contacts data for a single city-place pair
$city->places->first()->pivot->open_hours; // or whatever you include in withPivot above

现在,还有另一种设置方法,以防您需要Contacts自己建模:

// Places model
public function contact()
{
  return $this->hasOne('Contacts', 'places_id');
}

// Contacts model
public function city()
{
  return $this->belongsTo('Cities', 'cities_id');
}

public function place()
{
  return $this->belongsTo('Places', 'places_id');
}

// Cities model
public function contact()
{
  return $this->hasOne('Contacts', 'cities_id');
}

然后:

$city = Cities::first();
$city->contact; // Contacts model
$city->contact->place; // Places model

hasManyThrough 根本不会在这里工作