laravel retrive old() wherein query values - mysql

Question

I have 2 multiple value select lists that I pass users between them using jquery.
<select multiple="multiple" id="ListAllUsers" class="form-control">
#foreach ($users as $user)
<option class="content" value="{{ $user->id }}">{{ $user->name }}</option>
#endforeach
</select>
<select name="user_id[]" required multiple="multiple" id="SelectedUsers" class="form-control">
#if (!empty(old('user_id')) && $create_form)
#foreach ($old_value_users as $old_user)
<option class="content" value="{{ $old_user->id }}">{{ $old_user->name }}</option>
#endforeach
#endif
</select>
Now, my issue is that when I go and pass the old('user_id') value in the whereIn query, I only get the first result of the array instead of all of the results that are passed in.
$old_users_id = [old('user_id')];
$old_value_users = User::whereIn('id', $old_users_id)->get();
If I replace $old_users_id = [old('user_id')] with $old_users_id = [1,2,3], it works like a charm. I have dd(old('user_id')) and it is indeed an array, so I do not understand what is the hick-up!

Answer 1

Since old('user_id') is an array, you should not put it in an array. Try this;
You shold provide an empty array if old('user_id') is null.
$old_users_id = old('user_id')?old('user_id'):[];
$old_value_users = User::whereIn('id', $old_users_id)->get();
+ point
Instead of whereIn try with whereIntegerInRaw if you are adding a large array of integer bindings to your query.For more check documentation

Answer 2

Something like this one
<select class="custom-select chosen-select {{ $errors -> has('add_project_owner') ? 'is-invalid' : '' }}" name="add_project_owner[]" id="add_project_owner" multiple>
<option value="">choose</option>
#foreach ($owners as $owner)
<option value="{{ $owner -> emp_name }}" {{ (collect(old('add_project_owner'))->contains($owner -> emp_name)) ? 'selected' : '' }}>{{ $owner -> emp_name }}</option>
#endforeach
</select>