classlib/ExpenseTracker.Application/Accounts/Queries/Get/GetAccountQueryHandler.cs

using AutoMapper;
using MediatR;
using ExpenseTracker.Application.Common.Interfaces.Repositories;
using ExpenseTracker.Domain.Entities;

namespace ExpenseTracker.Application.Accounts.Queries.Get;

public class GetAccountQueryHandler : IRequestHandler<GetAccountQuery, AccountDto>
{
    private readonly IMapper _mapper;
    private readonly IAccountRepository _accountRepository;
    private readonly ITransactionRepository _transactionRepository;

    public GetAccountQueryHandler(
        IMapper mapper,
        IAccountRepository repository,
        ITransactionRepository transactionRepository)
    {
        _mapper = mapper;
        _accountRepository = repository;
        _transactionRepository = transactionRepository;
    }

    public async Task<AccountDto> Handle(GetAccountQuery request, CancellationToken cancellationToken)
    {
        var entity = _accountRepository.Queryable
            .FirstOrDefault(e => e.Id == request.Id);

        return _mapper.Map<AccountDto>(entity);
    }
}