separate each value with comma from multiple select in laravel - laravel

Question

I make task manager there is a form where to assign task I want to do that if user select multiple option then it is seperated by comma
This is my form
<form method="post" action="{{route('assignments.store')}}">
#csrf
<table>
<tr>
<td>Task Title : </td>
<td>
<select name="task_id" id="task_id">
#foreach ($tasks as $task)
<option value="{{ $task->id }}">{{ $task->title }}</option>
#endforeach
</select>
</td>
</tr>
<tr>
<td>Staff Name : </td>
<td>
<select name="staff_id" multiple>
<option value=null>Select One</option>
#foreach ($staffs as $staff)
<option value="{{ $staff->id }}">{{ $staff->name }}</option>
#endforeach
</select>
</td>
</tr>
<tr>
<td>Done At :</td>
<td><input type="time" name="done_at" class="form-control"></td>
</tr>
<td><button class="btn btn-primary" name="submit" type="submit" value="submit">Submit</button></td>
</table>
</form>
And this is my store function from where I storing the data recieved from form
$request->validate([
'staff_id' => 'required',
'task_id' => 'required',
'done_at' => 'sometimes',
]);
$assignment = new Assignment();
$assignment->staff_id = $request->staff_id;
$assignment->task_id = $request->task_id;
$assignment->done_at = $request->done_at;
$assignment->save();
return redirect()->route('assignments.index', compact('assignment'))->withSuccess('Done');

Answer 1

try this,
change the name=staff_id[]
<select id="staff" name="staff_id[]" multiple="multiple">
---
</select>
you can check the by
dd(implode(',', $request->staff_id));
$assignment = new Assignment();
$assignment->staff_id = implode(',', $request->staff_id);
And ya one more thing I forgot to tell you in your database I think staff_id is f.k so it will allow one id at the item to store so what you have to do CHANGE staff_id with type varchar then it will allow to store value with comma separate.
And below is the image form implode we are converting an array to string
Please set select name = staff_id[] then only you will get multiple data