Laravel4: Call to a member function update() on a non-object - php

Question

Following are my codes:
Model:
class Slide extends \Eloquent {
// Add your validation rules here
public static $rules = [
'title' => 'required|between:3,100',
'image' => 'required',
'url' => 'url',
'active' => 'integer'
];
// Don't forget to fill this array
protected $fillable = ['title', 'image', 'url', 'active'];
}
Controller Update Method:
public function update($id)
{
$slide = Slide::find($id);
$validator = Validator::make($data = Input::all(), Slide::$rules);
if ($validator->fails())
{
return Redirect::back()->withErrors($validator)->withInput();
}
$slide->update($data);
return Redirect::route('admin.slides.index')
->with('message', 'Slide has been updated.')
->with('message-type', 'alert-success');
}
Route:
Route::group(array('prefix' => 'admin'), function() {
# Slides Management
Route::resource('slides', 'AdminSlidesController', array('except' => array('show')));
});
Form in View:
{{ Form::model($slide, array('route' => 'admin.slides.update', $slide->id, 'method' => 'put')) }}
#include('admin/slides/partials/form')
{{ Form::close() }}
Partial Form is simple form, not sure if I need to share it here or not. Let me know.
Error:
Edit page loads perfectly and populates data from db, but when I submit the edit form, I get following error:
Call to a member function update() on a non-object
The following line seems to be creating problems:
$slide->update($data);
I have searched over the internet for solution but nothing is working. Have tried composer dump_autoload, even tried doing everything from scratch in a new project, still same issue. :(
Help please!!
---- Edit ----
Just quickly tried following:
public function update($id)
{
$slide = Slide::find($id);
$slide->title = Input::get('title');
$slide->save();
return Redirect::route('admin.slides.index')
->with('message', 'Slide has been updated.')
->with('message-type', 'alert-success');
}
Now the error:
Creating default object from empty value
----- Solution: -----
The problem was with my form as suggested by #lukasgeiter
I changed my form to following at it worked like a charm:
{{ Form::model($slide, array('route' => array('admin.slides.update', $slide->id), 'method' => 'put')) }}

Answer 1

use $slide->save(); instead of $slide->update($data);
to update a model please read the laravel doc here
To update a model, you may retrieve it, change an attribute, and use the save method:
EX :
$user = User::find(1);
$user->email = 'john#foo.com';
$user->save();

Answer 2

The actual problem is not your controller but your form.
It should be this instead:
{{ Form::model($slide, array('route' => array('admin.slides.update', $slide->id), 'method' => 'put')) }}
This mistake causes the controller to receive no id. Then find() yields no result and returns null.
I recommend besides fixing the form you also use findOrFail() which will throw a ModelNotFoundException if no record is found.
$slide = Slide::findOrFail($id);