translate raw MySQL into Doctrine 1.2 - doctrine

Question

I'm having a heck of a time translating the following raw MySQL query, which has been tested and works very well, into doctrine 1.2:
SELECT
r.name AS regionname,
s.name AS statename
FROM
job j
LEFT JOIN
community c ON c.id = j.community_id
LEFT JOIN
state s ON s.id = c.state_id
LEFT JOIN
region r ON r.id = s.region_id
WHERE
r.id = 1
This does not work:
$q = Doctrine_Query::create()
->select('r.name AS regionname', 's.name AS statename')
->from('job j')
->leftJoin('community c ON c.id = j.community_id')
->leftJoin('state s ON s.id = c.state_id')
->leftJoin('region r ON r.id = s.region_id')
->where('r.id = 1')
->execute();
Here's my db structure, if it is useful:
job:
columns:
id
community_id
relations:
community: local_key: community_id, foreign_key: id, foreignAlias: Communitys
community:
columns:
id
state_id
relations:
state: local_key: state_id, foreign_key: id, foreignAlias: States
state:
columns:
id
name
region_id
relations:
region: local_key: region_id, foreign_key: id, foreignAlias: Regions
region:
columns:
id
name

Answer 1

I have noticed the same thing as well. Doing joins in Doctrine 1.2 is a little bit different from mysql. To do a join, you have to take advantage of the relationships that Doctrine creates in each component in your case the job class.
You can check the job's base class for these relationships I am talking about. In the setup method, they look like this for example for a community foreign key id in the job table:
$this->hasOne('community as Communitys', array(
'local' => 'community_id',
'foreign' => 'id'));
Back to your question, to do a join you have to reference the alias of the table where the foreign key belongs to. For example if you want to join on the community table with the alias Community:
->leftJoin('j.Community')
instead of
community c ON c.id = j.community_id
Notice that I didn't say join on id because in Doctrine 1.2 that is implied already. You can however choose to join on something else.
Likewise if tables you have previously joined to need to be joined to other tables they have foreign keys to you have to
1.use their alias in the current queryand
2.reference the component as stated in THEIR base class as well.
So you said that you want to join community to states in the current query the way you should do it is
// join job and community first
->from('job j')
->leftJoin('j.Community c')
// join community to state since they are the ones that are related
->leftjoin('c.States s')
From here I hope you can see the pattern. At the end of the day if you look at it the idea of joining is still the same with raw sql, the only difference is the syntax:
SQL syntax:
LEFT JOIN
community c ON c.id = j.community_id
DQL syntax:
->leftJoin('j.Community c')
Anyway to answer your question, here is how the join should somewhat be done:
$q = Doctrine_Query::create()
->select('*')
->from('job j')
->leftJoin('j.Community c')
->leftJoin('c.State s')
->leftJoin('s.Region r')
->where('r.id = 1')
->execute();