无法在空手道中获取json数组的长度

Question

有人可以帮忙吗？api.store.book [*]。author：未返回任何值。即使长度函数api.length（）无法正常工作。但是，api.store.book [0]：返回了详细信息。下面是参考json

*def api = read('book.json')
    
    {
        "store": {
            "book": [
                {
                    "category": "reference",
                    "author": "Nigel Rees",
                    "title": "Sayings of the Century",
                    "price": 8.95
                },
                {
                    "category": "fiction",
                    "author": "Evelyn Waugh",
                    "title": "Sword of Honour",
                    "price": 12.99
                }]}}


        
   
   

Answer 1

请阅读文档：https://github.com/intuit/karate#get-short-cut

* def authors = $api.store.book[*].author
* print authors