Laravel destroy and update methods not working - php

Question

Trying to delete entries using the destroy method in Laravel controller.
public function destroy($id)
{
$university = University::find($id);
$university->delete();
return redirect('/universities');
}
And this is what i'm using in the view
{!!Form::open(['action' => ['UniversityController#destroy', $university->Id], 'method' => 'POST'])!!}
{{Form::hidden('_method', 'DELETE')}}
{{Form::submit('Delete', ['class' => 'btn btn-danger'])}}
{!!Form::close()!!}
Getting no errors and browser redirects after the button is activated as instructed, but the entry still remains in the veiw list and in the DB. Using MySQL.
Posting to the DB also works fine, but having same problems with update method. No errors and get redirected as I should but no update has happened.
public function update(Request $request, $id)
{
$this->validate($request, [
'Name' => 'required',
'Country' => 'required'
]);
$university = University::find($id);
$university->Name = $request->input('Name');
$university->Country = $request->input('Country');
$university->save();
return redirect('/universities');
}
And in view:
{!! Form::open(['action' => ['UniversityController#update', $university->Id], 'method' => 'POST']) !!}
<div class="form-group">
{{Form::label('Name', 'Name')}}
{{Form::text('Name', $university->Name, ['class' => 'form-control', 'placeholder' => 'Name'])}}
</div>
<div class="form-group">
{{Form::label('Country', 'Country')}}
{{Form::text('Country', $university->Country, ['class' => 'form-control', 'placeholder' => 'Country'])}}
</div>
{{Form::hidden('_method', 'PUT')}}
{{Form::submit('Submit', ['class' =>'btn btn-primary'])}}
{!! Form::close() !!}
Also tried running without the hidden form methods, but same result.
My routes:
Route::get('/universities', 'UniversityController#index');
Route::get('/universities/create', 'UniversityController#create');
Route::get('/universities/{id}/edit', 'UniversityController#edit');
Route::put('/universities/{id}', 'UniversityController#update');
Route::post('/universities/create', 'UniversityController#store');
Route::delete('/universities/{id}', 'UniversityController#destroy');

Answer 1

Solved by setting public $primaryKey = 'Id'; in the model.