```

### Template-Kontextwerte

Im HTML, welches enthält:

{% raw %}

```jinja
Item ID: {{ id }}
```

{% endraw %}

... wird die `id` angezeigt, welche dem „Kontext“-`dict` entnommen wird, welches Sie übergeben haben:

```Python
{"id": id}
```

Mit beispielsweise einer ID `42` würde das wie folgt gerendert werden:

```html
Item ID: 42
```

在这里，我们只关注数据库的工具和机制。

///

/// tip

这里不是将每个关键字参数传递给Item并从Pydantic模型中读取每个参数，而是先生成一个字典，其中包含Pydantic模型的数据：

`item.dict()`

然后我们将dict的键值对 作为关键字参数传递给 SQLAlchemy `Item`：

`Item(**item.dict())`

然后我们传递 Pydantic模型未提供的额外关键字参数`owner_id`：

`Item(**item.dict(), owner_id=user_id)`

///

## 主**FastAPI**应用程序

现在在`sql_app/main.py`文件中 让我们集成和使用我们之前创建的所有其他部分。

### 创建数据库表

    } else if (exponent > MAX_EXPONENT) {
      return x.signum() * POSITIVE_INFINITY;
    }

    /*
     * We need the top SIGNIFICAND_BITS + 1 bits, including the "implicit" one bit. To make rounding
     * easier, we pick out the top SIGNIFICAND_BITS + 2 bits, so we have one to help us round up or
     * down. twiceSignifFloor will contain the top SIGNIFICAND_BITS + 2 bits, and signifFloor the
     * top SIGNIFICAND_BITS + 1.
     *

& 👆 💪 ⚙️ 🙆 🏷 ⚖️ 💽 💂‍♂ 📄 (👉 💼, Pydantic 🏷 `User`).

✋️ 👆 🚫 🚫 ⚙️ 🎯 💽 🏷, 🎓 ⚖️ 🆎.

👆 💚 ✔️ `id` & `email` & 🚫 ✔️ 🙆 `username` 👆 🏷 ❓ 💭. 👆 💪 ⚙️ 👉 🎏 🧰.

👆 💚 ✔️ `str`❓ ⚖️ `dict`❓ ⚖️ 💽 🎓 🏷 👐 🔗 ❓ ⚫️ 🌐 👷 🎏 🌌.

👆 🤙 🚫 ✔️ 👩‍💻 👈 🕹 👆 🈸 ✋️ 🤖, 🤖, ⚖️ 🎏 ⚙️, 👈 ✔️ 🔐 🤝 ❓ 🔄, ⚫️ 🌐 👷 🎏.

⚙️ 🙆 😇 🏷, 🙆 😇 🎓, 🙆 😇 💽 👈 👆 💪 👆 🈸. **FastAPI** ✔️ 👆 📔 ⏮️ 🔗 💉 ⚙️.

## 📟 📐

   * cost as fresh ones (1/QPS is the cost for each). We use this trick later.
   *
   * If we pick a function that goes /below/ that horizontal line, it means that we reduce the area
   * of the function, thus time. Thus, the RateLimiter becomes /faster/ after a period of
   * underutilization. If, on the other hand, we pick a function that goes /above/ that horizontal

@DoNotMock("Use ImmutableRangeMap or TreeRangeMap")
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public interface RangeMap<K extends Comparable, V> {
  /*
   * TODO(cpovirk): These docs sometimes say "map" and sometimes say "range map." Pick one, or at
   * least decide on a policy for when to use which.
   */

  /**
   * Returns the value associated with the specified key, or {@code null} if there is no such value.
   *

        String::class.java == returnType && callArgs.size == 1 && callArgs[0] is List<*>
      ) {
        val peerProtocols = callArgs[0] as List<*>
        // Pick the first known protocol the peer advertises.
        for (i in 0..peerProtocols.size) {
          val protocol = peerProtocols[i] as String
          if (protocol in protocols) {
            selected = protocol

    } else if (exponent > MAX_EXPONENT) {
      return x.signum() * POSITIVE_INFINITY;
    }

    /*
     * We need the top SIGNIFICAND_BITS + 1 bits, including the "implicit" one bit. To make rounding
     * easier, we pick out the top SIGNIFICAND_BITS + 2 bits, so we have one to help us round up or
     * down. twiceSignifFloor will contain the top SIGNIFICAND_BITS + 2 bits, and signifFloor the
     * top SIGNIFICAND_BITS + 1.
     *

* 将输出数据转换为其声明的类型。
* 校验数据。
* 在 OpenAPI 的*路径操作*中为响应添加一个 JSON Schema。
* 并在自动生成文档系统中使用。

但最重要的是：

* 会将输出数据限制在该模型定义内。下面我们会看到这一点有多重要。

/// note | "技术细节"

响应模型在参数中被声明，而不是作为函数返回类型的注解，这是因为路径函数可能不会真正返回该响应模型，而是返回一个 `dict`、数据库对象或其他模型，然后再使用 `response_model` 来执行字段约束和序列化。

///

## 返回与输入相同的数据

现在我们声明一个 `UserIn` 模型，它将包含一个明文密码属性。

```Python hl_lines="9  11"
{!../../docs_src/response_model/tutorial002.py!}
```

	if m.handlers.hasSubhandler(subID) && !id.isTestHandler() {
		return fmt.Errorf("handler %v, subroute:%v: %w", id.String(), s, ErrHandlerAlreadyExists)
	}
	m.handlers.subSingle[subID] = h
	// Copy so clients can also pick it up for other subpaths.
	m.handlers.subSingle[makeZeroSubHandlerID(id)] = h
	return nil
}

/*
// RegisterStateless will register a stateless handler that serves
// []byte -> stream of ([]byte, error) requests.