[SQL] Relationship with hasOne instead of belongsTo

I have a database something like

factories
id
gallery_id nullable
...

galleries
id
...


I want to use hasOne because every factory has one gallery and not the other way around. Still I found that only belongsTo works in the Factory model:

public function gallery(){
return $this->belongsTo(Gallery::class);
}


Is there a way around this or I have to accept that Eloquent works this way?

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