Laravel 5 updateOrCreate (or Delete) - laravel

Question

I have a setup where, I have a user_roles table.
Then the administrator, will be able to update these, by adding new role, updating the name of an old role, and lastly delete.
------------------
| id | user_role |
| 1 | admin |
| 2 | role 1 |
| 3 | role 3 |
------------------
I tried to use this block of code to update, add, delete the roles
public function update(Request $request, $id){
$roles = Model::all();
foreach($roles as $role){
$role->delete();
}
foreach($request->role as $role){
$role = new Model;
$role->user_role = $role;
$role->save();
}
}
But in the users table, I have a user_role column that references to the id of the user_roles table, so whenever I use the above code, all rows will be deleted, then a new id will be created for the new rows inserted. So, when I go back to the list of users, their user_role column will return null, because each user has a non-existing user_role id.
Using updateOrCreate kind of solves my problem, when it comes to updating old row/s or creating new row/s but the problem is, deleting rows. It can't delete rows.
I need to delete the rows that are existing in the database, and missing in the request.
What would be the best way to do this ?

Answer 1

I have fixed this case using the id approach proposed by maslauskast # https://laracasts.com/discuss/channels/laravel/updateorcreate-rows-from-a-csv-or-delete-if-not-on-the-csv?page=0
In your case a solution* will be
public function update(Request $request, $id){
$usersRoleToDelete = Model::all()->pluck('id', 'id');
foreach($request->role as $role) {
$createdOrUpdated = Model::createOrUpdate(['user_role' => $role]);
if (!empty($usersRoleToDelete[$createdOrUpdated->id])) {
unset($usersRoleToDelete[$createdOrUpdated->id]);
}
}
if (count($usersRoleToDelete)) {
Model::whereRaw(sprintf('id IN (%s)', implode(',', $usersRoleToDelete)))->delete();
/* Alternatively you could use
* Model::whereIn('id', $usersRoleToDelete)->delete();
* if the amount of ids is smaller than the maximum PDO arguments allowed
*/
}
}
Please note that I have not tested this.

Answer 2

this is my working updateOrCreate method based on Adrian answer in Laravel 5.3
public function update($id, Request $request)
{
$et=Model::find($id);
//update some parent table field's (if you want)
$et['type']=$request['type'];
$et['sum'] =preg_replace('/[^0-9]/s', '', $request['sum']); //for remove thousand separtor
$et->save();
$et_det=$et->et_dets()
->pluck('id','id'); // one-to-many relation
for ($i=0;$i<count($request['det_id']);$i++)
{//some matching condition
$createdOrUpdated = Model_dets::updateOrCreate(
[
'parent_id'=>$id,
'total'=>$request['total'][$i]
],
[
'columnA' => $request['columnA'][$i],
'ColumnB' => $request['ColumnB'][$i])
]);
if (!empty($et_det[$createdOrUpdated->id])) {
unset($et_det[$createdOrUpdated->id]);
}
}
if (count($et_det)) {
Model_det::whereIn('id', $et_det)->delete();
}
return Redirect::to('index')->with('alert-success','Update successfully');
}