(B) Add user repo

Clinics.Backend/Domain/Errors/IdentityErrors.cs

@@ -5,4 +5,5 @@ namespace Domain.Errors;
 public static class IdentityErrors
 {
     public static Error InvalidRole => new("Identity.InvalidRole", "Role specified for user is invalid");
+    public static Error NotFound => new("Identity.NotFound", "المستخدم غير مسجّل في النظام");
 }

Clinics.Backend/Domain/Repositories/IUserRepository.cs

+using Domain.Entities.Identity.Users;
+using Domain.Repositories.Base;
+using Domain.Shared;
+
+namespace Domain.Repositories;
+
+public interface IUserRepository : IRepository<User>
+{
+    public Task<Result<User>> GetByUserNameFullAsync(string userName);
+}

Clinics.Backend/Persistence/Repositories/Users/FullUserSpecification.cs

+using Domain.Entities.Identity.Users;
+using Persistence.Repositories.Specifications.Base;
+using System.Linq.Expressions;
+
+namespace Persistence.Repositories.Users;
+
+public class FullUserSpecification : Specification<User>
+{
+    public FullUserSpecification(Expression<Func<User, bool>>? criteria) : base(criteria)
+    {
+        AddInclude(user => user.Role);
+    }
+}

Clinics.Backend/Persistence/Repositories/Users/UserRepository.cs

+using Domain.Entities.Identity.Users;
+using Domain.Errors;
+using Domain.Repositories;
+using Domain.Shared;
+using Microsoft.EntityFrameworkCore;
+using Persistence.Context;
+using Persistence.Repositories.Base;
+
+namespace Persistence.Repositories.Users;
+
+public class UserRepository : Repositroy<User>, IUserRepository
+{
+    #region Ctor DI
+    public UserRepository(ClinicsDbContext context) : base(context)
+    {
+    }
+    #endregion
+
+    #region Create method
+    public override Task<Result<User>> CreateAsync(User entity)
+    {
+        _context.Entry(entity.Role).State = EntityState.Unchanged;
+        return base.CreateAsync(entity);
+    }
+    #endregion
+
+    #region Get by username
+    public async Task<Result<User>> GetByUserNameFullAsync(string userName)
+    {
+        var query = ApplySpecification(new FullUserSpecification(user => user.UserName == userName));
+
+        var result = await query.ToListAsync();
+
+        if (result.Count == 0)
+        {
+            return Result.Failure<User>(IdentityErrors.NotFound);
+        }
+        return result.First();
+    }
+    #endregion
+
+}