Changing single variable value in AppController - cakephp

Question

I have a Horse object that has a completed variable (text). I want to be able to click set complete in the View and then have that horse's completed variable set to "yes." After this, we would redirect the user to tasks/index. My thinking is to create setcomplete($id) function in Controller, so I could pass /setcomplete/4 and that horse's flag would change.
I have created a basic view for it, but the idea is that I would not need a view, but I do not know how to get around that....I was thinking of using $this->render() or something of this nature.
This is the basic code...pass in the id and then change the variable, then redirect to tasks/index.
I am not getting an error....its just not working, that's all.
public function setcomplete($id = null) {
if (!$this->Task->exists($id)) {
throw new NotFoundException(__('Invalid task'));
}
if ($this->request->is(array('post', 'put'))) {
$this->set('completed', 'yes');
if ($this->Task->save($this->request->data)) {
$this->Session->setFlash(__('The task has been updated.'));
return $this->redirect(array('action' => 'index'));
} else {
$this->Session->setFlash(__('The task could not be saved. Please, try again.'));
}
} else {
}
}

Answer 1

According to my understanding of your problem. you want to set the completed to yes for Task model.
i think you've done in a wrong way here.
what about the $this->request->data here?
Does it contain the data you want to save for the task model like the structure as below
Array(
'Task' => Array(
'id' => 4, // for eg..
'completed' => 'yes'
)
)
if not
you can solve the problem by doing like this. [Assuming you don't have $this->request->data]
public function setcomplete($id = null) {
if (!$this->Task->exists($id)) {
throw new NotFoundException(__('Invalid task'));
}
$this->Task->id = $id;
$this->Task->set('completed', 'yes')
if ($this->Task->save()) {
$this->Session->setFlash(__('The task has been updated.'));
return $this->redirect(array('action' => 'index'));
} else {
$this->Session->setFlash(__('The task could not be saved. Please, try again.'));
}
}