[Dbix-class] Prefetch Problem: Related data can't be fetched

[sindharta_tanuwijaya at yahoo.co.jp]

Hi,

I am having a problem, in which I couldn't get the relationship column data by using prefetch.
My relationship is declared like this, suppose we have two tables: railway and railway_station, which relationship is 1 to many.

#in railway schema
__PACKAGE__->has_many(
    "railway_station",
    "Schema::RailwayStation",
    { "foreign.railway_station_railway_id" => "self.railway_id" },
);

#in railway_station schema
__PACKAGE__->belongs_to(
  "railway",
  "Schema::Railway",
  { "foreign.railway_id" => "self.railway_station_railway_id" },
);

My prefetch command is as follows:

   my $railways = $schema->resultset('Railway')->search(
        {
           'me.railway_id' => { 'IN' => $selected_railway_ids },
        },
        { 
            join => 'railway_station',
            prefetch => 'railway_station',
        }
    );
    
I could get the values of the columns of the railways correctly, but not the columns of railway_stations.
If I use 'join' only though, I could get all the data for railways which only have 1 row of railway_station, but not for
railways which have more than 1 rows of railway_station.
Any ideas why this happened ? 
I have a hunch that maybe it's the ID of the railway_station that is causing this problem. In our current database, the primary key of
railway_station works as a dummy field, in which there are a lot of null values (although they are primary keys). 
Of course, I have my own objections to this current implementation, but I am wondering if that is indeed the problem, since the primary key of railway_station isn't supposed to be used in any query generated above ?
Or maybe I am missing something else here.

Regards,

Sindharta




 

 
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