控制器方法持久性问题

Question

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

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，所以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]，它创建了一个事务。 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：当我将数据从 CommandLineRunner 间接静态变量保存到数据库时 - 事务对象被保存，然后显示在 transactionsMadeList/transactionsReceivedList 中，也可以通过以下方式找到[GET] ~/transactions方法 但是当我尝试通过[POST] ~/transactions 方法创建Transaction 时，Transaction 正在创建但没有被添加到transactionsMade/transactionsReceived lists

感谢任何帮助，因为我现在对此有点支持：/ 似乎问题出在 Controller 方法中的持久部分 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。 （删除映射） 请尝试以下操作：

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<>();

控制器：

@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();
}