Error in writing a function in Cakephp - cakephp

Question

I'm working with cakephp for project development. I wrote a function to get data from the database and do a summation.I have created a table called user with height and weight in it. I want to retrieve that data,add them, and to return that. Here is the function I wrote.
public function calculate()
{
$Height=$this->set('user',$this->User->find('first'));
$Weight=$this->set('user1',$this->User->find('first'));
$sum=($Height+$Weight);
$this->set('SUM',$sum);
}
In the view I wrote the following code.
<div class="page-content">
<?php echo $user['User']['weight']; ?>
<?php echo $user1['User']['height']; ?>
<?php echo $SUM ?>
</div
Height and weight values are getting displayed. But the sum value is displayed as zero. Please help me to fix this.

Answer 1

I found a better way to do the above calculation. I used the following code in the controller.
public function calculate($id=null)
{
if (!$this->User->exists($id)) {
throw new NotFoundException(__('Invalid user'));
}
$this->set('user1',$this->User->find('first', array('fields' => ('height'),'conditions' => array('User.id' =>$id))));
$this->set('user',$this->User->find('first', array('fields' => ('weight'),'conditions' => array('User.id' =>$id))));
}
My view looks similar to the one mentioned above. This works fine with me...

Answer 2

First you need get the field from find. (You can use find condition to filter de user id for example).
$user = $this->User->find('first', array(
'conditions' => array('User.id' => $id),
'fields' => array('User.height', 'User.weight') // fields from your DB
));
So, you can do a pr($user) to see the data and know what use.
After do the sum and set to the view. Cakephp Set