php - Best Practice to update hasMany Relationships with laravel

Hello Actually am trying to create an app in which every project has some users i.e ProjectMembers.

here is project model with TeamMembers function.

class Project extends Model
{
    use HasFactory;

    function TeamMembers(){
        return $this->hasMany(ProjectMember::class);
    }
}

project members table schema.

Schema::create('projects_members', function (Blueprint $table) {
            $table->id();
            $table->unsignedBigInteger('project_id')->nullable();
            $table->unsignedBigInteger('user_id')->nullable();
            $table->foreign('project_id')->references('id')->on('projects');
            $table->foreign('user_id')->references('id')->on('users');
            $table->timestamps();
        });

Now for updating project members i have to first delete relationships from Project members and then saving new one. because i have added multiselect dropdown. $request->team_members have type array.

public function update(Request $request, $id)
    {
        // return $request;
        $project = Project::findorfail($id);
        $project->name = $request->project_name;
        $project->details = $request->details;
        $project->start_date = $request->start_date;
        $project->end_date =  $request->end_date;
      
        $members = $request->team_members;
        ProjectMember::where('project_id', $id)->delete();
        $this->update_project_memebers($members, $project);
       
        return redirect('/projects');
        
    }
public function update_project_memebers($members, $project){
        foreach ($members as $member_id) {
            $project_member = new ProjectMember();
            $project_member->project_id = $project->id;
            $project_member->user_id = $member_id;
            $project_member->save();
        }
    }

here am deleting cuz if someone created project with two members and when the he/she want to update then he/she can remove one member from multiselect then i have to delete relationship cuz he/she selected only one user.

I don't think it's a good practice, so can i achieve this same func. with another way? thankyou.

Solution:

First of all please make a proper naming convention of pivot tabel according to laravel and same for the model name too.

As of now the solution is

define relation as

Project

public function teamMembers()
{
    return $this->belongsToMany(ProjectMember::class, 'projects_members', 'project_id', 'member_id');
}

ProjectMember

public function projects()
{
    return $this->belongsToMany(Project::class, 'projects_members', 'member_id', 'project_id');
}

So now instead of deleting use sync() method. AS

$project->teamMembers()->sync($members);

Important docs,

https://laravel.com/docs/8.x/eloquent-relationships#syncing-associations