--- schema_version: "1" id: 3404107556669abf05835ecb6866d222b3c25d487a8609c8d0ce9d6060a208fd title: DataWeave を使用したデータのマップ collection: mulesoft version: current locale: ja-jp portal_url: https://docs.salesforce.com/mulesoft/current/ja-jp/dataweave/2.7/dataweave-cookbook-map.md canonical_url: https://docs.mulesoft.com/jp/dataweave/2.7/dataweave-cookbook-map source_site: docs.mulesoft.com content_type: documentation content_hash: 8ca364707bd783eaa5deb57e9c4ae4deae29bc263e956e8fdc12912a13c517bb description: MuleSoft Documentation Site release: "2.7" latest: false --- # DataWeave を使用したデータのマップ この DataWeave の例では、DataWeave ​`map`​ 関数を使用して、本の配列を反復処理し、それぞれで一連のタスクを実行します。 開始する前に、Mule 4 アプリケーションでは DataWeave のバージョン 2.x が使用されることに注意してください。Mule 3 アプリケーションでの DataWeave については、​[DataWeave バージョン 1.2 の例](#1.2@dataweave::dataweave-examples.adoc)​を参照してください。 他の DataWeave バージョンの場合は、DataWeave の目次のバージョンセレクターを使用できます。 この例では、次の DataWeave 関数を使用します。 - `books`​ 配列の各オブジェクトを調べる ​`map`​。 - 価格データを Number (数値) 型に強制変換する ​`as`​。これにより、変換で各要素の正しい型が生成されます。 DataWeave スクリプト: ```dataweave %dw 2.0 output application/json --- items: payload.books map (item, index) -> { book: item mapObject (value, key) -> { (upper(key)): value } } ``` 入力 JSON ペイロード: ```json { "books": [ { "-category": "cooking", "title":"Everyday Italian", "author": "Giada De Laurentiis", "year": "2005", "price": "30.00" }, { "-category": "children", "title": "Harry Potter", "author": "J K. Rowling", "year": "2005", "price": "29.99" }, { "-category": "web", "title": "XQuery Kick Start", "author": [ "James McGovern", "Per Bothner", "Kurt Cagle", "James Linn", "Vaidyanathan Nagarajan" ], "year": "2003", "price": "49.99" }, { "-category": "web", "-cover": "paperback", "title": "Learning XML", "author": "Erik T. Ray", "year": "2003", "price": "39.95" } ] } ``` 出力 JSON: ```json { "items": [ { "book": { "-CATEGORY": "cooking", "TITLE": "Everyday Italian", "AUTHOR": "Giada De Laurentiis", "YEAR": "2005", "PRICE": "30.00" } }, { "book": { "-CATEGORY": "children", "TITLE": "Harry Potter", "AUTHOR": "J K. Rowling", "YEAR": "2005", "PRICE": "29.99" } }, { "book": { "-CATEGORY": "web", "TITLE": "XQuery Kick Start", "AUTHOR": [ "James McGovern", "Per Bothner", "Kurt Cagle", "James Linn", "Vaidyanathan Nagarajan" ], "YEAR": "2003", "PRICE": "49.99" } }, { "book": { "-CATEGORY": "web", "-COVER": "paperback", "TITLE": "Learning XML", "AUTHOR": "Erik T. Ray", "YEAR": "2003", "PRICE": "39.95" } } ] } ```
本に複数の著者がいる場合、​item.author​ は 1 つの名前ではなく著者の配列全体に評価されます。
## [](#デフォルト値の使用)デフォルト値の使用 次の例では、上記と同じ変換を実行しますが、プロパティ「item」および「index」を明示的に定義しません。代わりに、それぞれのデフォルト名 (​`$`​ および ​`$$`​) でコールします。 DataWeave スクリプト: ```dataweave %dw 2.0 output application/json --- items: (payload.books map { category: "book", price: $.price as Number, id: $$, properties: { title: $.title, author: $.author, year: $.year as Number } }) ``` 入力 JSON ペイロード: ```json { "books": [ { "-category": "cooking", "title": { "-lang": "en", "#text": "Everyday Italian" }, "author": "Giada De Laurentiis", "year": "2005", "price": "30.00" }, { "-category": "children", "title": { "-lang": "en", "#text": "Harry Potter" }, "author": "J K. Rowling", "year": "2005", "price": "29.99" }, { "-category": "web", "title": { "-lang": "en", "#text": "XQuery Kick Start" }, "author": [ "James McGovern", "Per Bothner", "Kurt Cagle", "James Linn", "Vaidyanathan Nagarajan" ], "year": "2003", "price": "49.99" }, { "-category": "web", "-cover": "paperback", "title": { "-lang": "en", "#text": "Learning XML" }, "author": "Erik T. Ray", "year": "2003", "price": "39.95" } ] } ``` 出力 JSON: ```json { "items": [ { "category": "book", "price": 30.00, "id": 0, "properties": { "title": { "-lang": "en", "#text": "Everyday Italian" }, "author": "Giada De Laurentiis", "year": 2005 } }, { "category": "book", "price": 29.99, "id": 1, "properties": { "title": { "-lang": "en", "#text": "Harry Potter" }, "author": "J K. Rowling", "year": 2005 } }, { "category": "book", "price": 49.99, "id": 2, "properties": { "title": { "-lang": "en", "#text": "XQuery Kick Start" }, "author": [ "James McGovern", "Per Bothner", "Kurt Cagle", "James Linn", "Vaidyanathan Nagarajan" ], "year": 2003 } }, { "category": "book", "price": 39.95, "id": 3, "properties": { "title": { "-lang": "en", "#text": "Learning XML" }, "author": "Erik T. Ray", "year": 2003 } } ] } ``` ## [](#関連する例)関連する例 - [データの抽出](https://docs.mulesoft.com/jp/dataweave/2.7/dataweave-cookbook-extract-data) - [XML から JSON への変換](https://docs.mulesoft.com/jp/dataweave/2.7/dataweave-cookbook-perform-basic-transformation) - [キーの名前の変更](https://docs.mulesoft.com/jp/dataweave/2.7/dataweave-cookbook-rename-keys) - [オブジェクト要素の配列としてのマップ](https://docs.mulesoft.com/jp/dataweave/2.7/dataweave-cookbook-map-object-elements-as-an-array) - [オブジェクトのマップ](https://docs.mulesoft.com/jp/dataweave/2.7/dataweave-cookbook-map-an-object) ## [](#関連情報)関連情報 - [DataWeave の型](https://docs.mulesoft.com/jp/dataweave/2.7/dataweave-types) - [DataWeave セレクター](https://docs.mulesoft.com/jp/dataweave/2.7/dataweave-selectors) - [DataWeave の解説書](https://docs.mulesoft.com/jp/dataweave/2.7/dataweave-cookbook)