semesterWork/Presence.Api/Controllers/GroupController.cs

using domain.Service;
using domain.UseCase;
using Microsoft.AspNetCore.Mvc;
using Presence.Api.Response;

namespace Presence.Api.Controllers
{
    [ApiController]
    [Route("[controller]/api")]
    public class GroupController: ControllerBase
    {
        private readonly IGroupUseCase _groupService;

        public GroupController(IGroupUseCase groupService)
        {
            _groupService = groupService;
        }

        [HttpGet("/group")]
        public async Task<ActionResult<GroupResponse>> GetAllGroups()
        {
            var result = _groupService
                .GetGroupsWithStudents();
            var response = result
                .Select(group => new GroupResponse { 
                    Id = group.Id, 
                    Name = group.Name,
                    Users = group.Users.Select(user => new UserResponse {
                        Guid = user.Guid,
                        Name = user.Name
                    }).ToList(),
                }).ToList();
            return Ok(new GroupResponse());
        } 
    }
}