Populate data onto select tag(multiple) with data 'selected' - laravel-5.7

Question

I'm making a project management system with Laravel 5.7 where I have my tables User, Project, Project User and Task(not important here). I'm having difficulties
trying to edit my Project data as each Project has many User(collaborator). My Project User table acts as a pivot table to store the many to many relationship. All of the project Edit will be displayed in a bootstrap modal in a single page which i used a foreach loop to display all the data. So my problem now is I'm trying to load my data onto my multiple select tag while selecting the options that found.
Example User table has
James
Dexter
In project "A" the collaborator is
James
When i edit Project "A" the select input tag would set James with the selected attribute while Dexter would be "unselected". I have managed to populate the User name and set the selected attributes but due to some logically error, if I edit Project "A", it would set both James and Dexter as selected.
These are my tables
User
u_id PK
name
Project
p_id PK
p_name
status (Active/Inactive)
type (Team/Personal)
Project User
pu_id PK
p_id FK of Project table
u_id FK of user table
Project Controller(Index)
//Get Team data based on project type and user id
$teamProject = DB::table('projects_users')
->join('projects','projects_users.p_id','=','projects.p_id')
->select('projects_users.*','projects.*')
->where('projects.type','=','Team')
->where('projects.status','=','Active')
->where('u_id','=',Auth::user()->u_id)
->get();
//Get all collaborator
$allProjUser = DB::table('projects_users')
->join('projects','projects_users.p_id','=','projects.p_id')
->select('projects_users.*','projects.*')
->where('projects.type','=','Team')
->where('projects.status','=','Active')
->where('projects_users.role','=','Colab')
->get()->keyBy('u_id');
$allUser = User::where('u_id', '!=', Auth::id())->get();
Blade View
#foreach ($teamProject as $proj)
{!!Form::open(['action' => ['ProjectController#update',$proj->p_id],'method' => 'POST'])!!}
<!--Title-->
<div class="form-group row">
<label for="inputEmail3" class="col-md-3 col-form-label">Project Title</label>
<div class="col-sm-8">
<input type="title" class="form-control" id="p_name" name="p_name" placeholder="Title"
value="{{$proj->p_name}}" required>
</div>
</div>
<!--Colaborator-->
<div class="form-group row">
<label for="inputEmail3" class="col-md-3 col-form-label">Collaborator</label>
<div class="col-sm-6">
<select name="colab[]" id="colabEdit-{{$proj->p_id}}" placeholder="Select Your Member" required multiple>
<option value="" disabled>Select Your Member</option>
#foreach ($allUser as $user)
//Should validate if user exists in the project pivot table here
#if ($allProjUser->has($user->u_id))
<option value="{{ $user->u_id }}" selected>{{ $user->name }}</option>
#else
<option value="{{ $user->u_id }}">{{ $user->name }}</option>
#endif
#endforeach
</select>
</div>
</div>
#endforeach
Any help would be appreciated and sorry if my sentence structure or english is unclear. Thank you

Answer 1

Would it work to pass your "selected" values in via the controller vs. trying to apply the logic in the view?
Making some assumptions about your project.
In your controllers 'edit' method...
$users = User::all();
$project = Project::findOrFail($id);
foreach ($project->user as $projectUser) {
$selectedTags[] = $projectUser->id;
}
return view('edit', compact('project', 'users', 'selectedTags');
Then in your view...
<select multiple name="collaborators[]">
#foreach ($users as $user)
#if (in_array($user->id, $selectedTags))
<option selected value="{{$user->id}}">{{$user->name}}</option>
#else
<option value="{{$user->id}}">{{$user->name}}</option>
#endif
#endforeach
</select>
Then in the 'store' method, delete from project_user where p_id = the ID of the project edited. Add a new record for each of the collaborators[] array.