CODEWITHSUNDEEP
kohanakohana-3one-to-manykohana-orm
Plankje
Plankje

Reputation: 298

Kohana 3.1 ORM: Trying to build subsequent one-to-many relationships

I have a MySQL table structure that looks like this:

Countries -> Countries_Regions (FK: country_id) -> Countries_Regions_Cities (FK: region_id)

So, there's a one-to-many relationship between country and region, and there's a one-to-many relationship between region and city

I tried to link them with the following classes:

class Model_Country extends ORM {
    protected $_has_many = array('regions' => array("model" => "Countries_Region"));
}

class Model_Countries_Region extends ORM {
    protected $_has_many = array('cities' => array("model" => "Countries_Regions_City"));
    protected $_belongs_to = array('country' => array("model" => "Country"));
}

class Model_Countries_Regions_City extends ORM {
    protected $_belongs_to = array('region' => array("model" => "Countries_Region"));
}

Everything goes fine if I try to find all the regions with 

$country = ORM::factory("country", 1);
$region = $country->regions->find_all();

But when I try to find all the cities bottom-up, with

$country = ORM::factory("country", 1);
$city = $country->regions->cities->find_all();

It does recognize the city property in region, but it returns an empty row with all the city values set to NULL.

I feel like I'm missing something very obvious, but I can't figure out what it is. Please help me.

Upvotes: 1

Views: 525

Answers (1)

biakaveron
biakaveron

Reputation: 5483

It does recognize the city property in region

Because $country->regions returns an ORM object with prepared WHERE statements, not a list of regions. If you call $country->regions->find_all(), you will get an array of regions, but after that you can access to their cities only through foreach loop.

There is a simple way, I think. Just add a country_id field to a City model and define a Belong_To relationship. So you will be able to use $country->cities or $city->country without loading regions.

Upvotes: 2

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