CakePHP 3: How to automatically get fields from leftJoin? - mysql

Question

I have two tables. Cars and tires. Tires can(!) belong to a car. My tables looks like:
Tires:
id | car_id
-------------
1 | 17
2 | NULL
Cars:
id | name
-------------
17 | BMW
18 | Mercedes
From my understanding, if I want to get all(!) tires (including the car they belong to, if available) I can't create a inner join (so I can't use contain). I need to use a left join. But that way I have no idea how to automatically select all fields on table cars.
Query I do:
$query = $this->Tires->find('all');
$query->leftJoin(
['Cars' => 'cars'],
['Cars.id = Tires.car_id']
);
// brings this SQL query
SELECT Tires.id AS `Tires__id`, Tires.car_id AS `Tires__car_id`
FROM tires Tires
LEFT JOIN cars Cars ON Cars.id = Tires.car_id
But how do I automatically get all fields from cars as well?
UPDATE
burzum actually gave me the solution which I quickly want to detail out since I don't think it is well solved by cake...
In order to achieve what I tried to do, I need to add the following code:
$query
// you need to pass each model you want to get fields for
->select($this->Tires)
->select($this->Tires->Cars);
The car in its tire looks like this:
...
'Cars' => [
'id' => '17',
'name' => 'BMW'
]
...
If I did a contain, it would look like this:
...
'car' => object(App\Model\Entity\Car) {
'id' => (int) 17,
'name' => 'BMW',
'[new]' => false,
'[accessible]' => [
'*' => true
],
'[dirty]' => [],
'[original]' => [],
'[virtual]' => [],
'[errors]' => [],
'[invalid]' => [],
'[repository]' => 'Cars'
}
...
So, I can work with that. Still, I don't understand the different output...

Answer 1

http://book.cakephp.org/3.0/en/orm/query-builder.html#selecting-all-fields-from-a-table
Example taken from the above URL:
// Only all fields from the articles table including
// a calculated slug field.
$query = $articlesTable->find();
$query
->select(['slug' => $query->func()->concat(['title', '-', 'id'])])
->select($articlesTable); // Select all fields from articles
So in your case you need to pass an instance of the cars table to a select() call.