Laravel Eloquent: multiple foreign keys for relationship

I had to deal with a similar problem. The solution provided by @fab won’t work with eager loading because $this->source_file would be null at the time the relationship is processed. I came up with this solution

After installing Compoships and configuring it in your models, you can define your relationships matching multiple columns.

The owning side:

use Illuminate\Database\Eloquent\Model;
use Awobaz\Compoships\Compoships;

class Route extends Model
{
    use Compoships;

    public function trips()
    {
        return $this->hasMany('Trip', ['id', 'route_name', 'source_file'], ['route_id', 'route_name', 'source_file']);
    }
}

The inverse side:

use Illuminate\Database\Eloquent\Model;
use Awobaz\Compoships\Compoships;

class Trip extends Model
{
    use Compoships;

    public function route()
    {
        return $this->belongsTo('Route', ['route_id', 'route_name', 'source_file'], ['id', 'route_name', 'source_file']);
    }
}

Compoships supports eager loading.