monorepo/LCU.API.Collections.RepoApi-old/LCU.Shared.Collections.RepoApiLib/Repositories/ExternalUserRepository.cs

using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using LCU.Shared.Collections.RepoApiLib.Models;
using LCU.Shared.Collections.RepoApiLib.Persistence;
using Microsoft.EntityFrameworkCore;

namespace LCU.Shared.Collections.RepoApiLib.Repositories
{
    public class ExternalUserRepository : BaseRepository, IExternalUserRepository
    {
        public ExternalUserRepository(AppDbContext context) : base(context) { }

        public async Task<IReadOnlyCollection<ExternalUser>> ListAsync()
        {
            return await _context.ExternalUsers.AsNoTracking().ToListAsync();
        }

        public async Task<ExternalUser> FindByReferenceIdAsync(int referenceId)
        {
            return await _context.ExternalUsers.AsNoTracking().Where(user => user.ReferenceId == referenceId).FirstOrDefaultAsync();
        }

        public async Task SynchronizeSet(IReadOnlyCollection<ExternalUser> externalUsers)
        {
            foreach (var user in externalUsers)
            {
                var existing = await FindByReferenceIdAsync(user.ReferenceId);
                if ( existing != null)
                {
                    user.Id = existing.Id;
                    _context.Entry(user).State = EntityState.Modified;
                    _context.ExternalUsers.Update(user);
                }
                else
                {
                    await _context.ExternalUsers.AddAsync(user);
                }
            }
        }

    }
}