autobus-api_old/AutobusApi.Application/Regions/Commands/DeleteRegion/DeleteRegionCommandHandler.cs

using AutobusApi.Application.Common.Exceptions;
using AutobusApi.Application.Common.Interfaces;
using MediatR;
using Microsoft.EntityFrameworkCore;

namespace AutobusApi.Application.Regions.Commands.DeleteRegion;

public class DeleteRegionCommandHandler : IRequestHandler<DeleteRegionCommand>
{
    private readonly IApplicationDbContext _dbContext;

    public DeleteRegionCommandHandler(IApplicationDbContext dbContext)
    {
        _dbContext = dbContext;
    }

    public async Task Handle(
        DeleteRegionCommand request,
        CancellationToken cancellationToken)
    {
        var region = await _dbContext.Regions
            .SingleOrDefaultAsync(c => c.Id == request.Id, cancellationToken);

        if (region == null)
        {
            throw new NotFoundException();
        }

        _dbContext.Regions.Remove(region);

        await _dbContext.SaveChangesAsync(cancellationToken);
    }
}