How to join two tables in SilverStripe - silverstripe

Question

I've been searching all over the place and couldn't find a solution. I want to join two tables in SilverStripe. It's very simple:
class Module extends DataObject {
...
static $has_one = array(
'Website' => 'Website'
);
...
}
class Website extends DataObject {
...
static $has_many = array(
'Modules' => 'Module'
);
...
}
I want to join these two, and get all the attributes in one DataList. The leftJoin() function won't do anything, and it's mentioned in their website that
Passing a $join statement to will filter results further by the JOINs performed against the foreign table. It will not return the additionally joined data.
I tried to use raw query
DB::query('SELECT * FROM "Module" LEFT JOIN "Website" ON "Website"."ID" = "Module"."WebsiteID"');
but all I got was this
MySQLQuery Object ( [handle:protected] => mysqli_result Object ( [current_field] => 0 [field_count] => 19 [lengths] => [num_rows] => 5 [type] => 0 ) [currentRecord:protected] => [rowNum:protected] => -1 [queryHasBegun:protected] => )
Anyone has any idea how to do that? Thanks!

Answer 1

I found a way around. It's not the perfect solution for joining two tables, especially when there are a lot of attributes, but it does give me what I want for now.
$modules = Module::get();
$list = new ArrayList();
foreach($modules as $module) {
$website = Website::get()->filter(array(
'ID' => $module->WebsiteID
))->first();
$array = array("mName" => $module->Name,
"mDes" => $module->Description,
"wName" => $website->Name);
$list->push($array);
}

Answer 2

You indeed cannot get the joined data through the default ORM. If you, however, choose to decide to use the DB::Query(), you can easily fetch them as an array.
An example:
$items = DB::Query("
SELECT
Module.Title,
Website.URL
FROM Module
LEFT JOIN Website ON Website.ID = Module.WebsiteID
");
if($items) {
$i = 0;
foreach($items as $item) {
$moduleTitle = $item['Title'];
$websiteURL = $item['URL'];
}
}
This option is faster than the workaround you suggested. If you need an ArrayList because you want to use the data in a template, build the ArrayList yourself, or use a snippet like this.