App\Http\Controllers\ProfilesController::update PHP Method

    public function update($username, Request $request)
    {
        $user = $this->getUserByUsername($username);
        $input = Input::only('location', 'bio', 'twitter_username', 'github_username');
        $profile_validator = $this->profile_validator($request->all());
        if ($profile_validator->fails()) {
            $this->throwValidationException($request, $profile_validator);
            return redirect('profile/' . $user->name . '/edit')->withErrors($validator)->withInput();
        }
        if ($user->profile == null) {
            $profile = new Profile();
            $profile->fill($input);
            $user->profile()->save($profile);
        } else {
            $user->profile->fill($input)->save();
        }
        return redirect('profile/' . $user->name . '/edit')->with('status', 'Profile updated!');
    }