Django REST Frameworkは、Djangoを下敷きにしてWeb APIを構築する柔軟なツールキットとして、APIの機能を向上させるために作られました。

Mozilla、Red Hat、Eventbrite など多くの企業で利用されています。

これは**自動的なAPIドキュメント生成**の最初の例であり、これは**FastAPI**に向けた「調査」を触発した最初のアイデアの一つでした。

/// note | "備考"

Django REST Framework は Tom Christie によって作成されました。StarletteとUvicornの生みの親であり、**FastAPI**のベースとなっています。

///

/// check | "**FastAPI**へ与えたインスピレーション"

自動でAPIドキュメントを生成するWebユーザーインターフェースを持っている点。

///

     * an I/O error, or if the target entry is evicted while this editor is active. In either case
     * we delete the editor's created files and prevent new files from being created. Note that once
     * an editor has been detached it is possible for another editor to edit the entry.
     */
    internal fun detach() {
      if (entry.currentEditor == this) {
        if (civilizedFileSystem) {

      }
    } else {
      checkArgument(keyEntry == ABSENT, "Key already present: %s", key);
    }

    // insertion point for new entry is after predecessor
    // note predecessor must still be a valid entry: either we deleted an entry that was *not*
    // predecessor, or we didn't delete anything

    ensureCapacity(size + 1);
    keys[size] = key;
    values[size] = value;

   * concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary,
   * non-deterministic behavior at an undetermined time in the future.
   *
   * <p>Note that the fail-fast behavior of an iterator cannot be guaranteed as it is, generally
   * speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent

这儿有一个**FastAPI**和**PostgreSQL**的官方项目生成器，全部基于**Docker**，包括前端和更多工具：<a href="https://github.com/tiangolo/full-stack-fastapi-postgresql" class="external-link" target="_blank">https://github.com/tiangolo/full-stack-fastapi-postgresql</a>

///

/// note

请注意，大部分代码是`SQLAlchemy`的标准代码，您可以用于任何框架。FastAPI特定的代码和往常一样少。

///

## ORMs（对象关系映射）

**FastAPI**可与任何数据库在任何样式的库中一起与 数据库进行通信。

一种常见的模式是使用“ORM”：对象关系映射。

ORM 具有在代码和数据库表（“*关系型”）中的**对象**之间转换（“*映射*”）的工具。

 * ```
 *
 * Clear the connection pool with [evictAll()][ConnectionPool.evictAll]. Note that the connection
 * pool's daemon thread may not exit immediately.
 *
 * ```java
 * client.connectionPool().evictAll();
 * ```
 *
 * If your client has a cache, call [close()][Cache.close]. Note that it is an error to create calls
 * against a cache that is closed, and doing so will cause the call to crash.
 *

**FastAPI** hoàn toàn được dựa trên những gợi ý kiểu dữ liệu, chúng mang đến nhiều ưu điểm và lợi ích.

Nhưng thậm chí nếu bạn không bao giờ sử dụng **FastAPI**, bạn sẽ được lợi từ việc học một ít về chúng.

/// note

Nếu bạn là một chuyên gia về Python, và bạn đã biết mọi thứ về gợi ý kiểu dữ liệu, bỏ qua và đi tới chương tiếp theo.

///

## Động lực

Hãy bắt đầu với một ví dụ đơn giản:

```Python

@app.get("/")
async def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
async def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

**Note**

Si vous n'êtes pas familier avec cette notion, consultez la section _"Vous êtes pressés ?"_ à propos de <a href="https://fastapi.tiangolo.com/fr/async/#vous-etes-presses" target="_blank">`async` et `await` dans la documentation</a>.

// which in-turn heals the respective meta directory path and any files in int.
func (h *healSequence) healMinioSysMeta(objAPI ObjectLayer, metaPrefix string) func() error {
	return func() error {
		// NOTE: Healing on meta is run regardless
		// of any bucket being selected, this is to ensure that
		// meta are always upto date and correct.

		return defPool, noReadQuorumPools, nil
	}
	return PoolObjInfo{}, noReadQuorumPools, toObjectErr(errFileNotFound, bucket, object)
}

// return all pools with read quorum error or no error for an object with given opts.Note that this array is
// returned in the order of recency of object ModTime.
func (z *erasureServerPools) poolsWithObject(pools []PoolObjInfo, opts ObjectOptions) (errs []poolErrs) {
	for _, pool := range pools {