blazor-swm/Features/Organization/EmployeeGroup/Cqrs/CreateEmployeeGroupHandler.cs

using Indotalent.ConfigBackEnd.Exceptions;
using Indotalent.ConfigBackEnd.Extensions;
using Indotalent.Infrastructure.Database;
using MediatR;
using Microsoft.EntityFrameworkCore;

namespace Indotalent.Features.Organization.EmployeeGroup.Cqrs;

public class CreateEmployeeGroupRequest
{
    public string? Name { get; set; }
    public string? Description { get; set; }
}

public class CreateEmployeeGroupResponse
{
    public string? Id { get; set; }
    public string? Name { get; set; }
}

public record CreateEmployeeGroupCommand(CreateEmployeeGroupRequest Data) : IRequest<CreateEmployeeGroupResponse>;

public class CreateEmployeeGroupHandler : IRequestHandler<CreateEmployeeGroupCommand, CreateEmployeeGroupResponse>
{
    private readonly AppDbContext _context;

    public CreateEmployeeGroupHandler(AppDbContext context) => _context = context;

    public async Task<CreateEmployeeGroupResponse> Handle(CreateEmployeeGroupCommand request, CancellationToken cancellationToken)
    {
        var isExists = await _context.EmployeeGroup
            .AnyAsync(x => x.Name == request.Data.Name, cancellationToken);

        if (isExists)
        {
            throw new AlreadyExistsException("Employee Group", request.Data.Name ?? string.Empty);
        }

        var entity = new Data.Entities.EmployeeGroup
        {
            Name = request.Data.Name,
            Description = request.Data.Description
        };

        _context.EmployeeGroup.Add(entity);
        await _context.SaveChangesAsync(cancellationToken);

        return new CreateEmployeeGroupResponse
        {
            Id = entity.Id,
            Name = entity.Name
        };
    }
}