java - Controller 方法持久化问题

Question

我有以下场景:两个实体 - Transaction和Account交易仅涉及两个账户。

创建交易后，accountSender 的金额减少，而 accountReceiver 的金额增加。

Account实体拥有两个列表 - transactionsMadeList和transactionsReceivedList总的来说，它看起来像这样:

[
    {
        "id": 1,
        "holder": "Pavel S",
        "balance": -950,
        "transactionsMade": [
            {
                "id": 1,
                "amount": 50,
                "created": "2019-09-01T13:37:24.565579Z",
                "senderAccountId": 1,
                "receiverAccountId": 2
            },
            {
                "id": 3,
                "amount": 35,
                "created": "2019-09-01T13:37:24.614450Z",
                "senderAccountId": 1,
                "receiverAccountId": 2
            }
        ],
        "transactionsReceived": [
            {
                "id": 2,
                "amount": 50,
                "created": "2019-09-01T13:37:24.609462Z",
                "senderAccountId": 2,
                "receiverAccountId": 1
            }
        ]
    },
    {
        "id": 2,
        "holder": "Gustaf S",
        "balance": 1070,
        "transactionsMade": [
            {
                "id": 2,
                "amount": 50,
                "created": "2019-09-01T13:37:24.609462Z",
                "senderAccountId": 2,
                "receiverAccountId": 1
            }
        ],
        "transactionsReceived": [
            {
                "id": 1,
                "amount": 50,
                "created": "2019-09-01T13:37:24.565579Z",
                "senderAccountId": 1,
                "receiverAccountId": 2
            },
            {
                "id": 3,
                "amount": 35,
                "created": "2019-09-01T13:37:24.614450Z",
                "senderAccountId": 1,
                "receiverAccountId": 2
            }
        ]
    }
]

我实现了Controller方法[POST]这会创建一个交易。代码如下:

@Transactional
    @PostMapping("/transactions")
    public ResponseEntity<Transaction> createTransaction(@Valid @RequestBody Transaction transaction) {
        final Transaction result = transactionRepository.save(transaction);
        final URI location = ServletUriComponentsBuilder.fromCurrentRequest().
                path("/{id}")
                .buildAndExpand(result.getId()).toUri();
        Account sender = accountRepository.findById(result.getSenderAccountId()).get();
        Account receiver = accountRepository.findById(result.getReceiverAccountId()).get();
        Transaction tr = transactionRepository.findById(result.getId()).get();
        Integer emitterBalance = accountRepository.findById(result.getSenderAccountId()).get().getBalance();
        Integer receptorBalance = accountRepository.findById(result.getReceiverAccountId()).get().getBalance();
        Integer amount = tr.getAmount();
        Integer emitterFinalBalance = emitterBalance - amount;
        Integer receptorFinalBalance = receptorBalance + amount;


        sender.setBalance(emitterFinalBalance);
        accountRepository.save(sender);

        receiver.setBalance(receptorFinalBalance);
        accountRepository.save(receiver);

        transactionRepository.save(result);
        transactionRepository.save(tr);
        return ResponseEntity.created(location).build();
    }

我的问题是:当我将 CommandLineRunner 中的数据持久保存到数据库时间接静态变量 - 交易对象被保存，然后显示在 transactionsMadeList/transactionsReceivedList 中也可以通过 [GET] ~/transactions 找到方法但是当我尝试创建Transaction时通过[POST] ~/transactions方法，Transaction正在创建，但未添加到 transactionsMade/transactionsReceived lists

非常感谢任何帮助，因为我现在有点堆栈了:/看来问题出在 Controller 方法的持久化部分如果您需要实体类，请告诉我，我也会发布它们

Answer 1

您应该将交易添加到帐户中。(删除了映射者)尝试以下操作:

帐户类别更改

@OneToMany(fetch = FetchType.LAZY,cascade = CascadeType.ALL)
private List<Transaction> transactionsMade = new ArrayList<>();

@OneToMany(fetch = FetchType.LAZY,cascade = CascadeType.ALL)
private List<Transaction> transactionsReceived = new ArrayList<>();

Controller :

@Transactional
@PostMapping("/transactions")
public ResponseEntity<Transaction> createTransaction(@Valid @RequestBody Transaction transaction) {
    final Transaction storedTransaction = transactionRepository.save(transaction);
    final URI location = ServletUriComponentsBuilder.fromCurrentRequest().
            path("/{id}")
            .buildAndExpand(storedTransaction.getId()).toUri();
    Account sender = accountRepository.findById(storedTransaction.getSenderAccountId()).get();
    Account receiver = accountRepository.findById(storedTransaction.getReceiverAccountId()).get();
    Integer emitterBalance = accountRepository.findById(storedTransaction.getSenderAccountId()).get().getBalance();
    Integer receptorBalance = accountRepository.findById(storedTransaction.getReceiverAccountId()).get().getBalance();
    Integer amount = storedTransaction.getAmount();
    Integer emitterFinalBalance = emitterBalance - amount;
    Integer receptorFinalBalance = receptorBalance + amount;

    sender.setBalance(emitterFinalBalance);
    sender.getTransactionsMade().add(storedTransaction);
    accountRepository.save(sender);

    receiver.setBalance(receptorFinalBalance);
    receiver.getTransactionsReceived().add(storedTransaction);
    accountRepository.save(receiver);

    return ResponseEntity.created(location).build();
}