group after order - cakephp

Question

In cakephp 2 I want to group table after descending order
always returned the first record of table
but I want returned last record by ordering
my data, code and result in here:
My data in table:
Code in controller:
$books = $this->Book->find('all', array(
'order' => array('age' => 'DESC'),
'group' => 'name'
));
print_r($books);
Result after the code above:
Array
(
[0] => Array
(
[Book] => Array
(
[id] => 1
[name] => ramin
[family] => zardoshti
[age] => 32
[city] => semnan
)
)
[1] => Array
(
[Book] => Array
(
[id] => 2
[name] => esmaeil
[family] => seydi
[age] => 30
[city] => semnan
)
)
)
But I want this result:
Array
(
[0] => Array
(
[Book] => Array
(
[id] => 1
[name] => ramin
[family] => zardoshti
[age] => 42
[city] => tehran
)
)
[1] => Array
(
[Book] => Array
(
[id] => 2
[name] => esmaeil
[family] => seydi
[age] => 30
[city] => semnan
)
)
)

Answer 1

Add a virtual field on the fly to your Book model
$this->Book->virtualFields = array(
'max_age' => sprintf('max(%s.age)', $this->Book->alias)
);
$books = $this->Book->find('all', array(
'order' => array('age' => 'DESC'),
'group' => 'name'
));
print_r($books);
The virtual field will help to get the rows with the maximum age value.
Your SQL query will look like :
SELECT
`Book`.`id`, `Book`.`name`, `Book`.`family`, `Book`.`age`,
`Book`.`city`, (max(`Book`.`age`)) AS `Book__max_age`
FROM
`test`.`books` AS `Book`
WHERE
1 = 1
GROUP BY
name
ORDER BY
`age` DESC