initial commit

Features/Utilities/BookingGroup/Cqrs/CreateBookingGroupHandler.cs

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+using Indotalent.ConfigBackEnd.Exceptions;
+using Indotalent.Infrastructure.Database;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Indotalent.Features.Utilities.BookingGroup.Cqrs;
+
+public class CreateBookingGroupRequest
+{
+    public string? Name { get; set; }
+    public string? Description { get; set; }
+}
+
+public class CreateBookingGroupResponse
+{
+    public string? Id { get; set; }
+    public string? Name { get; set; }
+}
+
+public record CreateBookingGroupCommand(CreateBookingGroupRequest Data) : IRequest<CreateBookingGroupResponse>;
+
+public class CreateBookingGroupHandler : IRequestHandler<CreateBookingGroupCommand, CreateBookingGroupResponse>
+{
+    private readonly AppDbContext _context;
+
+    public CreateBookingGroupHandler(AppDbContext context) => _context = context;
+
+    public async Task<CreateBookingGroupResponse> Handle(CreateBookingGroupCommand request, CancellationToken cancellationToken)
+    {
+        var isExists = await _context.BookingGroup
+            .AnyAsync(x => x.Name == request.Data.Name, cancellationToken);
+
+        if (isExists)
+        {
+            throw new AlreadyExistsException("Booking Group", request.Data.Name ?? string.Empty);
+        }
+
+        var entity = new Data.Entities.BookingGroup
+        {
+            Name = request.Data.Name,
+            Description = request.Data.Description
+        };
+
+        _context.BookingGroup.Add(entity);
+        await _context.SaveChangesAsync(cancellationToken);
+
+        return new CreateBookingGroupResponse
+        {
+            Id = entity.Id,
+            Name = entity.Name
+        };
+    }
+}