IM_NEW/GroupService.Infrastructure/Reposities/GroupReposity.cs

using GroupService.Domain.Entities;
using GroupService.Domain.IReposities;
using Microsoft.EntityFrameworkCore;

namespace GroupService.Infrastructure.Reposities
{
    public class GroupReposity : IGroupReposity
    {
        private readonly GroupDbContext db;

        public GroupReposity(GroupDbContext db)
        {
            this.db = db;
        }

        public Group Create(Group group)
        {
            db.Groups.Add(group);
            return group;
        }

        public async Task<Group?> FindByIdAsync(Guid id)
        {
            return await db.Groups.FirstOrDefaultAsync(x => x.Id == id);
        }

        public async Task<IEnumerable<Group>> FindByMasterIdAsync(Guid userId)
        {
            return await db.Groups.Where(x => x.GroupMaster == userId).ToListAsync();
        }

        public async Task<IEnumerable<Group>> FindByMemberIdAsync(Guid userId)
        {
            var groupIds = db.GroupMembers
                .Where(member => member.UserId == userId)
                .Select(member => member.GroupId);

            return await db.Groups
                .Where(group => groupIds.Contains(group.Id))
                .OrderByDescending(group => group.ModificationTime ?? group.CreationTime)
                .ToListAsync();
        }

        public async Task<IEnumerable<Group>> FindByNameAsync(string name)
        {
            return await db.Groups.Where(x => x.Name == name).ToListAsync();
        }
    }
}