Variable in view not the same in all pages.

[eluser]Atharva[/eluser]

Code:

$results = $this->adModel->get_by_id($ad_id);

This will obviously show error as $ad_id is not defined in constructor.

As i mentioned earlier, you need to call

Code:

$results = $this->adModel->get_by_id($ad_id);

in index function.