Update data with Laravel Collective forms - laravel-5

Question

I have an edit form with Laravel Collective but when clicking the button, the data do not update. Below are my codes.
Form:
{!! Form::model($post, ['route' => ['/post/update/', $post->id]]) !!}
{{ method_field('PATCH') }}
<div class="form-group">
<div class="row">
<div class="col-lg-6">
{!! Form::label('title', 'Title') !!}
{!! Form::text('title', null, ['class' => 'form-control']) !!}
</div>
<div class="col-lg-6">
{!! Form::label('category_id', 'Category') !!}
{!! Form::select('category_id', $categories, null, ['class' => 'form-control']) !!}
</div>
</div>
</div>
<div class="form-group">
{!! Form::label('content', 'Content') !!}
{!! Form::textarea('content', null, ['class' => 'form-control', 'rows' => 10]) !!}
</div>
<hr/>
<div class="form-group">
{!! Form::submit('Update', ['class' => 'btn btn-success pull-right']) !!}
</div>
{!! Form::close() !!}
Controller:
public function edit($id)
{
return \View::make('admin/post/edit')->with([
'post' => \DB::table('posts')->find($id),
'categories' => \App\Category::lists('category', 'id')
]);
}
public function update(Request $request, Post $post)
{
$post->update($request->all());
return \Redirect::to('/admin/posts');
}
Routes:
Route::get('/admin/post/edit/{id}', 'Admin\PostController#edit');
Route::patch('/post/update/', [
'as' => '/post/update/',
'uses' => 'Admin\PostController#update'
]);
It's a bit different from the Laracast, and it's confusing me. Framework is new to me and the lack of code to do something is confusing.

Answer 1

I solved it. Mass Assignment. explains what to do if using update or create
So, the update method is:
public function update(Request $request, Post $post)
{
$post->title = $request->title;
$post->category_id = $request->category_id;
$post->content = $request->content;
$post->save();
return \Redirect::to('/admin/posts');
}