on update method getting error - php

Question

I am trying to perform UPDATE operation but getting error Symfony \ Component \ HttpKernel \ Exception \ MethodNotAllowedHttpException. Getting this error when I press the UPDATE button for data update. I can not understand the error reason. Please help!!!
controller block update method
public function update(Request $request, $id)
{
$book = Book::find($id);
$book -> BookName = $request->get('NBookName');
$book -> BookID = $request->get('NBookId');
$book -> BookUnitPrice = $request->get('NBookUnitPrice');
if($book->save())
{
return view('pages.book', $this->fetchData())->with('alert-success', 'books updated successfully.');
}
else
{
return redirect()->back()->with('alert-success',$error->getMessage());
}
}
update page
<form class="form-horizontal" method="POST" action="{{action('BookController#update', $id)}}" enctype="multipart/form-data">
{{ csrf_field() }}
<input type="hidden" name="_method" value="PATCH"/>
<div class="row" style="padding-left: 1%;">
<div class="col-md-4">
<div class="form-group">
<label>Book Name</label><span class="required">*</span>
<input type="text" value="{{$book->BookName}}" maxlength="100" minlength="3" autofocus="autofocus" autocomplete="off" required="required" name="NBookName" class="form-control"/>
</div>
</div>
<div class="col-md-4">
<div class="form-group" style="padding-left: 5%;">
<label>Book ID</label><span class="required">*</span>
<input type="text" value="{{$book->BookID}}" maxlength="10" minlength="1" autocomplete="off" required="required" name="NBookId" class="form-control"/>
</div>
</div>
<div class="col-md-4">
<div class="form-group" style="padding-left: 5%;">
<label>Unit Price</label><span class="required">*</span>
<input type="text" value="{{$book->BookUnitPrice}}" maxlength="5" required="required" autocomplete="off" runat="server" name="NBookUnitPrice" class="form-control" onkeypress="return decimalOnly(event)"/>
</div>
<div class="form-group" style="padding-left: 5%;">
<button type="submit" class="btn btn-primary">Update</button>
</div>
</div>
</div>
</form>
Route list
// for books
Route::get('/book','BookController#create');
Route::post('/book','BookController#store');
Route::get('/book/{id}','BookController#edit');
Route::patch('/book/{id}', 'BookController#update');
I updated the route method from PUT to PATCH, it worked. Now the data is updating. But the success message in UPDATE is not printing. Please help!!!
Please see the image attached for the error page.

Answer 1

You either have to change
<input type="hidden" name="_method" value="PATCH"/>
to
<input type="hidden" name="_method" value="PUT"/>
or change
Route::put('/book/{id}', 'BookController#update');
to
Route::patch('/book/{id}', 'BookController#update');