如何从空手道中的对象数组列表中仅获取少数元素

Question

我有以下 json：

{
    "store": { 
        "book": [ { 
            "category": "reference", 
            "author": "Nigel Rees", 
            "title": "Sayings of the Century", 
            "price": 8.95 
        }, { 
            "category": "fiction", 
            "author": "J. R. R. Tolkien", 
            "title": "The Lord of the Rings", 
            "isbn": "0-395-19395-8", 
             "price": 22.99 
        } ], 
        "bicycle": { 
            "color": "red", "price": 19.95 
        } 
    }, 
    "expensive": 10 
}

我想通过以下方式检索所有books'author和category：

[ { 
    "category": "reference", 
    "author": "Nigel Rees" 
}, { 
    "category": "fiction", 
    "author": "J. R. R. Tolkien" 
} ]

Answer 1

请阅读文档：https://github.com/intuit/karate#json-transforms

* def fun = function(x){ return { category: x.category, author: x.author } }
* def books = karate.map(response.store.book, fun)