Laravel 5.4 messagebag

I have a form that I validate in a controller.

I use messageBag because there is a complicated validation I need to do.

I need to do some calculations and give a list of errors.

The problem is, I don't get the old('value') of the form fields when I use that method.

My code in the controller:

$errors = new MessageBag();

    $validator = Validator::make(Input::all(), [
        "blended" => "required|numeric|min:0.1",
    ],
    [
        'blended.required' => 'Please enter a valid weight',
        'blended.min' => 'Please enter the weight you blended',
        'blended.numeric' => 'Invalid weight blended',
    ]);

    if( $validator->fails() )
    {
        $errors->add('blended', 'Please enter a valid weight');
        alert()->overlay('Error!', 'Errors: Wrong weight was given', 'error');
        return Redirect::route('roast.index');
    }

    $blend_id = $request->blend_id;        
    $blend_weight = $request->blended * 1000;

    // Blend - Get coffees and their weights for the blend
    $blend_coffees = $this->getBlendCoffeesWeight($blend_id, $blend_weight);

    foreach($blend_coffees as $cof) {
        $have = 'none';
        $coffee_id = $cof['coffee_id'];

        $roasted = $this->getTotalRoasted($coffee_id);
        $packed = $this->getTotalCoffeePacked($coffee_id);
        $blended = $this->getTotalCoffeeBlended($coffee_id);
        $total_weight_packed = 

        $shop_usage = $this->getTotalShopUsage($coffee_id);

        $weight_left = $roasted - $packed['total'] - $blended - $shop_usage;

        //Not enough to pack and not Blend Anyway
        if($weight_left < $cof['weight'] && $request->blend_anyway == 0) {
            $coffee_name = Coffee::find($coffee_id);
            $coffee_name = $coffee_name->name;
            $need = $this->convertWeight($cof['weight']);
            $have = $this->convertWeight($weight_left);
            $errors->add('weight', "You need: $need of $coffee_name but you have: $have");
        } else {
            //Creating an array for the table updates later
            $blends[] = array('coffee_id'=>$coffee_id, 'blended'=>$blend_coffees[$coffee_id]['weight']);
        }
    }

    if($errors->any()) {
        alert()->error('Error!', 'You cannot blend please check the errors');
        return Redirect::route('roast.index')->withErrors($errors);

How can I get the old values for the fields in the form?

via Chebli Mohamed