public async Task <ActionResult <Borrower> > GetById(string id)
        {
            var borrower = await _borrowerService.GetByIdAsync(id);

            if (borrower == null)
            {
                return(NotFound());
            }

            var loans = await _loanService.GetByBorrowerIdAsync(id);

            if (loans.Any())
            {
                borrower.Loans = new List <Loan>();
                foreach (var loan in loans)
                {
                    var collections = await _collectionService.GetByLoanIdAsync(loan.Id);

                    if (collections.Any())
                    {
                        loan.LoanCollections = new List <LoanCollection>();
                        foreach (var collection in collections)
                        {
                            loan.LoanCollections.Add(collection);
                        }
                    }
                    borrower.Loans.Add(loan);
                }
            }

            return(Ok(borrower));
        }