mapping search wip (stuck)

app/Models/Event.php

@@ -41,21 +41,21 @@ class Event extends Model
 
     public function group()
     {
-        return $this->hasOne(Group::class, 'id', 'group_id');
+        return $this->belongsTo(Group::class);
     }
 
     public function competition_group()
     {
-        return $this->hasOne(CompetitionGroup::class, 'id', 'competition_group_id');
+        return $this->belongsTo(CompetitionGroup::class);
     }
 
     public function home()
     {
-        return $this->hasOne(Element::class, 'id', 'home_id');
+        return $this->belongsTo(Element::class);
     }
 
     public function away()
     {
-        return $this->hasOne(Element::class, 'id', 'away_id');
+        return $this->belongsTo(Element::class);
     }
 }