检查jsonPath中是否有任何值重复

问题描述

我有一个如下的jsonPath

I have a jsonPath as below

{   "book":
        [
            { "category": "reference",
              "author": "Nigel Rees",
              "title": "Sayings of the Century",
              "price": 8.95
            },
            { "category": "fiction",
              "author": "Nigel Rees",
              "title": "Sword of Honour",
              "price": 12.99
            }
]}

还要检查是否重复了任何作者姓名?我尝试过

And Want to check if any author name have got repeated?I tried

$.book[?(@.author=='Nigel Rees')].find(1)

但是，它总是抛出一个什么都找不到的异常，我该如何检查author='Nigel Rees'出现的地方，即author='Nigel Rees'是否有两本书?

But, it always throws an exception that found nothing, how could I check that the author='Nigel Rees' occurrences i.e author='Nigel Rees' have a two books?

推荐答案

如果存在作者姓名，则取决于您计划执行的操作.如果只希望作者为Nigel Reese的对象，则可以使用过滤器.

Depends what you are planning on doing if the authors names exists.If you only want the objects with author of Nigel Reese you could use a filter.

    var booksByNigelReese = book.filter( function(book, index) {
        return book.author === 'Nigel Reese'
    })

.filter()带有一个接受书和索引的函数，根据该函数的结果是true还是false

.filter() takes a function that takes the book and index, chooes to accept or rejcet the book into a new array depending if the result of the function is true or false

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