Show duplicate entry warning in laravel - php

Question

how to display duplicate entry warning error to my view in laravel blade. so when they key in same name the warning will appear when they saved it.
Note: i have already make my Schema $table->string('studentname')->unique();;
Controller
public function store(Request $request)
{
$this->validate($request, [
'studentname'=>'required|max:50',
]);
$students = new Student();
$students->studentname = $request->studentname;
$students->address = $request->address;
$students->religion = $request->religion;
$students->save();
return redirect()->route('students.index')
->with('flash_message', 'Success.');
}
View-Blade
<div class="container">
<h1 class="well">Registration Form</h1>
<div class="col-lg-12 well">
<div class="row">
<form action="{{route('students.store')}}" method="POST">
{{csrf_field()}}
<div class="col-sm-12">
<h3>CHILD'S INFORMATION</h3>
<hr>
<div class="row">
<div class="col-sm-4 form-group">
<label>FULLNAME</label>
<input type="text" name="studentname" value="" placeholder="Enter FULLNAME.." class="form-control" required>
</div>
<div class="col-sm-4 form-group">
<label>RELIGION</label>
<input type="text" name="religion" value="" placeholder="Enter RELIGION.." class="form-control">
</div>
<div class="col-sm-4 form-group">
<label>ADDRESS</label>
<input type="text" name="address" value="" placeholder="Enter ADDRESS.." class="form-control">
</div>
<div>
<button type="submit" class="btn btn-default">SUBMIT</button>
</div>
</div>
</div>
</div>

Answer 1

Add the unique validation which returns a message if it fails.
$this->validate($request, [
'studentname'=>'required|max:50|unique:table_name,studentname',
]);
And then, in your blade template, do this.
<div class="col-sm-4 form-group {{ $errors->get('studentname') ? 'has-error' : '' }}">
<label>FULLNAME</label>
<input type="text" name="studentname" value="" placeholder="Enter FULLNAME.." class="form-control" required>
#foreach($errors->get('studentname') as $error)
<span class="help-block">{{ $error }}</span>
#endforeach
</div>