FastAPIでクエリストリングパラメータを効果的に利用する方法

FastAPIとクエリストリングパラメータの基本

FastAPIは、Pythonの非常に高速（高性能）、使いやすい、モダンな、高速（クイック）なWebフレームワークです。それは非常に直感的で、使いやすいですが、それは同時に非常に強力で、大規模なWebアプリケーションを構築するための多くの高度な機能を提供します。

クエリストリングパラメータは、URLの一部であり、特定の情報をWebサーバーに送信するために使用されます。これらのパラメータは、URLの末尾に?記号の後に追加され、&記号で区切られます。

FastAPIでは、関数のパラメータとしてクエリパラメータを宣言することで、これらのクエリストリングパラメータを簡単に扱うことができます。これにより、FastAPIは自動的にリクエストからこれらのパラメータを抽出し、適切な型に変換し、バリデーションを行い、APIドキュメンテーションにこれらのパラメータを追加します。

次のセクションでは、これらのクエリストリングパラメータの宣言と使用方法について詳しく説明します。: https://fastapi.tiangolo.com/; https://fastapi.tiangolo.com/features/; https://developer.mozilla.org/ja/docs/Learn/HTML/Howto/Use_data_attributes; https://developer.mozilla.org/ja/docs/Web/API/URLSearchParams; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/

クエリストリングパラメータの宣言と使用

FastAPIでは、クエリストリングパラメータを関数のパラメータとして宣言することができます。これにより、FastAPIは自動的にリクエストからこれらのパラメータを抽出し、適切な型に変換し、バリデーションを行い、APIドキュメンテーションにこれらのパラメータを追加します。

以下に、クエリストリングパラメータの宣言と使用の例を示します。

from fastapi import FastAPI
from typing import Optional

app = FastAPI()

@app.get("/items/")
async def read_items(q: Optional[str] = None):
    return {"q": q}

上記の例では、qという名前のクエリストリングパラメータを宣言しています。このパラメータはオプショナルで、デフォルト値はNoneです。

この関数を呼び出すときに、URLのクエリストリングにqパラメータを含めることができます。例えば、/items/?q=somequeryのようにします。

FastAPIは、このqパラメータを自動的に抽出し、関数のパラメータとして提供します。また、このパラメータはAPIドキュメンテーションにも自動的に追加されます。

次のセクションでは、型変換とバリデーションについて詳しく説明します。: https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params-and-string-validations/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; 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https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; 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https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https://fastapi.tiangolo.com/tutorial/query-params-list-multiple-values/; https

型変換とバリデーション

FastAPIでは、クエリストリングパラメータの型を指定することができます。これにより、FastAPIは自動的にリクエストからこれらのパラメータを抽出し、指定された型に変換します。また、この型変換はAPIドキュメンテーションにも反映されます。

以下に、型変換の例を示します。

from fastapi import FastAPI
from typing import Optional

app = FastAPI()

@app.get("/items/")
async def read_items(q: Optional[str] = None, price: float = 0.0):
    return {"q": q, "price": price}

上記の例では、priceという名前のクエリストリングパラメータを宣言しています。このパラメータの型はfloatで、デフォルト値は0.0です。

この関数を呼び出すときに、URLのクエリストリングにpriceパラメータを含めることができます。例えば、/items/?price=19.99のようにします。

FastAPIは、このpriceパラメータを自動的に抽出し、float型に変換します。また、このパラメータはAPIドキュメンテーションにも自動的に追加されます。

さらに、FastAPIはバリデーションも自動的に行います。例えば、priceパラメータに文字列を指定すると、FastAPIはエラーレスポンスを返します。

次のセクションでは、オプショナルなクエリパラメータの扱いについて詳しく説明します。: https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; 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オプショナルなクエリパラメータの扱い

FastAPIでは、クエリストリングパラメータをオプショナルにすることができます。これは、パラメータが必須ではなく、リクエストに含まれていない場合にデフォルト値を使用することを意味します。

以下に、オプショナルなクエリストリングパラメータの例を示します。

from fastapi import FastAPI
from typing import Optional

app = FastAPI()

@app.get("/items/")
async def read_items(q: Optional[str] = None):
    return {"q": q}

上記の例では、qという名前のクエリストリングパラメータを宣言しています。このパラメータはオプショナルで、デフォルト値はNoneです。

この関数を呼び出すときに、URLのクエリストリングにqパラメータを含めることができます。例えば、/items/?q=somequeryのようにします。しかし、qパラメータが含まれていない場合でも、この関数はエラーを返さずに動作します。

次のセクションでは、複数のパスパラメータとクエリパラメータの同時利用について詳しく説明します。: https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; 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https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/query-params/

複数のパスパラメータとクエリパラメータの同時利用

FastAPIでは、パスパラメータとクエリパラメータを同時に使用することができます。これにより、APIのエンドポイントが柔軟性と強力な機能を持つことができます。

以下に、パスパラメータとクエリパラメータの同時利用の例を示します。

from fastapi import FastAPI
from typing import Optional

app = FastAPI()

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

上記の例では、item_idという名前のパスパラメータと、qという名前のクエリストリングパラメータを宣言しています。

この関数を呼び出すときに、URLのパスにitem_idパラメータを含め、クエリストリングにqパラメータを含めることができます。例えば、/items/5?q=somequeryのようにします。

FastAPIは、これらのパラメータを自動的に抽出し、関数のパラメータとして提供します。また、これらのパラメータはAPIドキュメンテーションにも自動的に追加されます。

このように、FastAPIではパスパラメータとクエリパラメータを同時に使用することで、APIのエンドポイントが非常に柔軟で強力になります。: https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-params-and-numerical-validations/; 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https://fastapi.tiangolo.com/tutorial/query-params-str-validations/; https://fastapi.tiangolo.com/tutorial/path-params/; https://fastapi.tiangolo.com/tutorial/query-params/; https://fastapi.tiangolo.com/tutorial/path-

FastAPIでクエリストリングパラメータを効果的に利用する方法

投稿者: tanadog 投稿日: 2024年4月17日

FastAPIとクエリストリングパラメータの基本

クエリストリングパラメータの宣言と使用

型変換とバリデーション

オプショナルなクエリパラメータの扱い

複数のパスパラメータとクエリパラメータの同時利用

0件のコメント

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FastAPIでクエリストリングパラメータを効果的に利用する方法

投稿者: tanadog 投稿日: 2024年4月17日

FastAPIとクエリストリングパラメータの基本

クエリストリングパラメータの宣言と使用

型変換とバリデーション

オプショナルなクエリパラメータの扱い

複数のパスパラメータとクエリパラメータの同時利用

0件のコメント

コメントを残す コメントをキャンセル

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