有没有办法合并laravel中的两个关系?
这就是它现在设置的方式,但是有没有办法让两者合并?
public function CompetitionsHome() {
return $this->HasMany( 'Competition', 'home_team_id' );
}
public function CompetitionsGuest() {
return $this->HasMany( 'Competition', 'guest_team_id' );
}
public function Competitions() {
// return both CompetitionsHome & CompetitionsGuest
}
尝试使用getter方法获取从关系返回的合并集合的属性。
public function getCompetitionsAttribute($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取不同的结果集。
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);
}
如果您更喜欢使用merge()方法来组合两个集合(关系),它将覆盖具有相同索引键的元素,因此您将丢失从一个关系中获得的一些数据。
您应该选择push()方法,通过将一个集合推送到其他集合的末尾来创建新的数组键
这是一个示例:
public function getCompetitionsAttribute($value) {
$competitionsHome = $this->competitionsHome;
$competitionsGuest = $this->competitionsGuest;
// PUSH ONE TO OTHER!
return $competitionsHome->push($competitionsGuest);
}
如果由于谷歌而有人像我一样登陆这里:因为既没有merge()也没有push()允许急切加载(和其他好的关系功能),讨论并没有以这个线程结束,而是在这里继续:Laravel Eloquent Inner Join on Self Referencing Table
我提出了一个解决方案here,任何进一步的想法和对这个问题的贡献欢迎。