使用ashphy json path evaluator和以下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
},
{ "category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
},
{ "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
}
}
}
我想写一个过滤类别的查询,例如"小说",然后只返回第一个元素。我似乎无法弄明白。
例如,$..book[?(@.category == "fiction")]
将返回3本书的数组,但我只想要第一本书:
{ "category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
}
可以吗?显而易见的事情似乎是添加一个" [0]"到最后,但它不起作用。
答案 0 :(得分:0)
我检查了分析网站(注意:这是来自测试http://ashphy.com/JSONPathOnlineEvaluator/):
放置[0]索引可以正常工作。该站点仅接受jsonPath(jsonObj,查询字符串)参数内部的内容,因此索引引用必须超出此站点不执行的评估范围。
jsonPath(foo, '$..book[?(@.category == "fiction")]')[0]