php - Laravel 合并关系

Question

有没有办法在 Laravel 中合并 2 个关系？

这是现在的设置方式，但有没有办法可以合并返回？

  public function CompetitionsHome() {
    return $this->HasMany( 'Competition', 'home_team_id' );
  }
  public function CompetitionsGuest() {
    return $this->HasMany( 'Competition', 'guest_team_id' );
  }
  public function Competitions() {
    // return both CompetitionsHome & CompetitionsGuest
  }

Answer 1

为返回从关系返回的合并集合的属性尝试 getter 方法。

public function getCompetitionsAttribute($value)
{
    // There two calls return collections
    // as defined in relations.
    $competitionsHome = $this->competitionsHome;
    $competitionsGuest = $this->competitionsGuest;

    // Merge collections and return single collection.
    return $competitionsHome->merge($competitionsGuest);
}

或者您可以在返回集合之前调用其他方法以获得不同的结果集。

public function getCompetitionsAttribute($value)
{
    // There two calls return collections
    // as defined in relations.
    // `latest()` method is shorthand for `orderBy('created_at', 'desc')`
    // method call.
    $competitionsHome = $this->competitionsHome()->latest()->get();
    $competitionsGuest = $this->competitionsGuest()->latest()->get();

    // Merge collections and return single collection.
    return $competitionsHome->merge($competitionsGuest);
}