autobus-api_old/AutobusApi.Application/Routes/Queries/GetRoute/GetRouteQueryHandler.cs

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

namespace AutobusApi.Application.Routes.Queries.GetRoute;

public class GetRouteQueryHandler : IRequestHandler<GetRouteQuery, RouteDto>
{
    private readonly IApplicationDbContext _dbContext;
    private readonly IMapper _mapper;

    public GetRouteQueryHandler(
        IApplicationDbContext dbContext,
        IMapper mapper)
    {
        _dbContext = dbContext;
        _mapper = mapper;
    }

    public async Task<RouteDto> Handle(
        GetRouteQuery request,
        CancellationToken cancellationToken)
    {
        var route = await _dbContext.Routes
            .ProjectTo<RouteDto>(_mapper.ConfigurationProvider)
            .SingleOrDefaultAsync(c => c.Id == request.Id);

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

        return route;
    }
}