# モデル - より詳しく

先ほどの例に続き、複数の関連モデルを持つことが一般的です。

これはユーザーモデルの場合は特にそうです。なぜなら:

* **入力モデル** にはパスワードが必要です。
* **出力モデル**はパスワードをもつべきではありません。
* **データベースモデル**はおそらくハッシュ化されたパスワードが必要になるでしょう。

/// danger | "危険"

ユーザーの平文のパスワードは絶対に保存しないでください。常に認証に利用可能な「安全なハッシュ」を保存してください。

知らない方は、[セキュリティの章](security/simple-oauth2.md#password-hashing){.internal-link target=_blank}で「パスワードハッシュ」とは何かを学ぶことができます。

///

## 複数のモデル

      to the Licensor or its representatives, including but not limited to
      communication on electronic mailing lists, source code control systems,
      and issue tracking systems that are managed by, or on behalf of, the
      Licensor for the purpose of discussing and improving the Work, but
      excluding communication that is conspicuously marked or otherwise

      to the Licensor or its representatives, including but not limited to
      communication on electronic mailing lists, source code control systems,
      and issue tracking systems that are managed by, or on behalf of, the
      Licensor for the purpose of discussing and improving the Work, but
      excluding communication that is conspicuously marked or otherwise

In this case, it might not be a problem, because it's the same user sending the password.

But if we use the same model for another *path operation*, we could be sending our user's passwords to every client.

/// danger

Never store the plain password of a user or send it in a response like this, unless you know all the caveats and you know what you are doing.

///

## Add an output model

	// - the CmdAdd comes back thru here with a new IP
	// - we will never clean up that old IP that we "lost"
	// To fix this we probably need to impl CmdDel + manage our own podUID/IP mapping.
	if retErr == nil {
		// Handle node healthcheck probe rewrites
		_, err = s.addPodToHostNSIpset(pod, podIPs)
		if err != nil {

      RunnableExecutorPair(Runnable runnable, Executor executor) {
        this.runnable = runnable;
        this.executor = executor;
      }
    }
  }

  // A version of the list that uses compare and swap to manage the stack without locks.
  @SuppressWarnings({"SunApi", "removal"}) // b/345822163
  private static final class ExecutionListCAS {
    static final Logger log = Logger.getLogger(ExecutionListCAS.class.getName());

Se você está apenas iniciando com o **FastAPI** você pode querer pular isso por enquanto.

///

Em python, você pode criar Gerenciadores de Contexto ao <a href="https://docs.python.org/3/reference/datamodel.html#context-managers" class="external-link" target="_blank"> criar uma classe com dois métodos: `__enter__()` e `__exit__()`</a>.

     * call, so we can't assume that writes to the Entry have been safely published by some other
     * synchronization actions.)
     *
     * All that said: I haven't actually managed to make this particular test produce a TSAN error
     * for the field accesses in MapIteratorCache. This test *has* found other TSAN errors,

## 🥙 🤝 ⏮️ ↔

🔜, 🔀 🤝 *➡ 🛠️* 📨 ↔ 📨.

👥 ⚙️ 🎏 `OAuth2PasswordRequestForm`. ⚫️ 🔌 🏠 `scopes` ⏮️ `list` `str`, ⏮️ 🔠 ↔ ⚫️ 📨 📨.

& 👥 📨 ↔ 🍕 🥙 🤝.

/// danger

🦁, 📥 👥 ❎ ↔ 📨 🔗 🤝.

✋️ 👆 🈸, 💂‍♂, 👆 🔜 ⚒ 💭 👆 🕴 🚮 ↔ 👈 👩‍💻 🤙 💪 ✔️, ⚖️ 🕐 👆 ✔️ 🔁.

///

```Python hl_lines="155"
{!../../docs_src/security/tutorial005.py!}
```

                     Tape* tape, const GradientRegistry& registry) {
  TF_RETURN_IF_ERROR(op_->Execute(retvals, num_retvals));
  for (int i = 0; i < *num_retvals; i++) {
    // TODO(srbs): Manage refcount of ForwardOperation's inputs/outputs.
    forward_op_->outputs.push_back(retvals[i]);
  }
  // TODO(b/166669239): This is needed to support AttrBuilder::Get for string