Laravel validation not working after submit - laravel

Question

This did not show the errors after submit
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Cars;
use App\Images;
use DB;
$this->validate($request,[
'name'=>'required|min:3',
'specifications'=>'required|min:10'
]);
Inserting values into the database.I want to validate on submitting the form
public function store(Request $request)
{
//
$this->validate($request->all(),[
'name'=>'required|min:3',
'specifications'=>'required|min:10'
]);
$cars = New Cars;
$cars->name = $request->name;
$cars->specifications = $request->specifications;
$cars->price = $request->price;
$cars->model_id = $request->model_id;
$cars->year = $request->year;
$cars->milage = $request->milage;
if($cars->save()) {
$id = DB::getPdo()->lastInsertId();
}
return redirect('home');
}
I displayed errors like this, but not working for me
#if(count($errors) > 0)
<div class="alert alert-danger">
#foreach($errors->all() as $error)
<p>{{ $error }}</p>
#endforeach
</div>
#endif

Answer 1

Add this piece of code on your controller method.
return back()->withErrors()->withInput()
you can also access old input value with old(field_name)

Answer 2

Use ->all() here to provide all input value in to validate
$this->validate($request->all(),[
Or you can try like this
public function store(Request $request)
{
$validatedData = $request->validate([
'title' => 'required|unique:posts|max:255',
'body' => 'required',
]);
// The blog post is valid...
}
And display error as
#if ($errors->any())
<div class="alert alert-danger">
<ul>
#foreach ($errors->all() as $error)
<li>{{ $error }}</li>
#endforeach
</ul>
</div>
#endif

Answer 3

first, edit your method like this :
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Cars;
use App\Images;
use DB;
use Validator;
and inside this method please edit your redirect route and make sure your redirect url, redirect you in the page that had the error message:
public function store(Request $request)
{
$validator = Validator::make($request->all(), [
'name'=>'required|min:3',
'specifications'=>'required|min:10'
]);
if ($validator->fails()) {
return redirect(route('make your route here '))
->withErrors($validator)
->withInput();
}
$cars = New Cars;
$cars->name = $request->name;
$cars->specifications = $request->specifications;
$cars->price = $request->price;
$cars->model_id = $request->model_id;
$cars->year = $request->year;
$cars->milage = $request->milage;
if($cars->save()) {
$id = DB::getPdo()->lastInsertId();
}
return redirect('home');
}
and for displaying error messages inside your blade template make this :
#if(!empty($errors))
#if($errors->any())
<div class="alert alert-danger">
<ul>
#foreach($errors->all() as $error)
<li>{!! $error !!}</li>
#endforeach
</ul>
</div>
#endif
#endif