在渴望加载中添加多个关系

Question

My application: In my application users have the possibility to predict the scores of upcoming soccer games. So basically there is a relationship between the user and predictions , but there is also a relationship between the prediction and my Match model . Currently I add the homeTeamName & awayTeamName in my prediction table but this is not really necessary since I store my match_id in my predictions table. I want to load my team names from my match table based on the match_id from my prediction table instead of adding the names in the predictions table.

Here is a look at my relations:

Match model

class Match extends Model
{
    public function Predictions() {

        return $this->hasMany('App\Prediction'); // one match has many predictions
    }
}

Prediction model

class Prediction extends Model
{
   public function User() {

       return $this->belongsTo('App\User'); // prediction belongs to a user
   }

   public function Match() {

       return $this->belongsTo('App\Match', 'match_id', 'match_id'); // prediction belongs to a match
   }
}

User model

class User extends Authenticatable
{
    public function Predictions() {

        return $this->hasMany('App\Prediction'); // a user has many predictions
    }

}

Using lazy eager loading for this query

public function showPredictions() {
    \DB::enableQueryLog();
    $user = Auth::user();

    $user->load('predictions', 'predictions.match'); 

    dd(\DB::getQueryLog());

    return view('predictions', compact('user'));
}

output

array:3 [▼
  0 => array:3 [▼
    "query" => "select * from `users` where `id` = ? limit 1"
    "bindings" => array:1 [▼
      0 => 1
    ]
    "time" => 13.0
  ]
  1 => array:3 [▼
    "query" => "select * from `predictions` where `predictions`.`user_id` in (?)"
    "bindings" => array:1 [▼
      0 => 1
    ]
    "time" => 1.0
  ]
  2 => array:3 [▼
    "query" => "select * from `matches` where `matches`.`id` in (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
    "bindings" => array:10 [▼
      0 => 233133
      1 => 233134
      2 => 233135
      3 => 233136
      4 => 233137
      5 => 233138
      6 => 233139
      7 => 233140
      8 => 233141
      9 => 233142
    ]
    "time" => 1.0
  ]
]

Answer 1

为了渴望加载嵌套关系，可以使用“点”语法

$user->load('predictions', 'predictions.match')->where('status', 'SCHEDULED'); 

Answer 2

Try this

$user->load([
   'predictions.match' => function ($query) {
        $query->where('status', 'SCHEDULED');
    }
]);

Or if you have status column in both tables:

$user->load([
   'predictions.match' => function ($query) {
        $query->where('predictions.status', 'SCHEDULED');
    }
]);