JSON 验证某个节点是否有值答案

【问题标题】：JSON verify that some node ha a valueJSON 验证某个节点是否有值
【发布时间】：2015-06-18 13:16:40
【问题描述】：

我有这个 JSON 响应：

{"modelpageStartData":{"WERKS":"2371","NAME1":"GAYLORD STORE","MATNR":"5405873","BISMT":"","EAN11":"","MAKTX":"LØPESKO ADIDAS","MEINS":"","BSTME":""},"modeltabReturnData":[],"modeltabArticleData":[{"DETAIL_TYPE":"MATNR","DETAIL_LABEL":"Varenummer i SAP","DETAIL_VALUE":"5405873","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"EAN","DETAIL_LABEL":"GTIN","DETAIL_VALUE":"4051936459253","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"SUPPLIER","DETAIL_LABEL":"Leverandør","DETAIL_VALUE":"G63942","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"SORTIMENT","DETAIL_LABEL":"Sortiment","DETAIL_VALUE":"P","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"ORIGINAL_PRICE","DETAIL_LABEL":"Ordinær pris","DETAIL_VALUE":"799.00 NOK","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"BSTME","DETAIL_LABEL":"Bestillingsenhet","DETAIL_VALUE":"","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"UNITS","DETAIL_LABEL":"","DETAIL_VALUE":"","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"MATNR","DETAIL_LABEL":"Varenummer i SAP","DETAIL_VALUE":"5405873","DETAIL_FILTER":"2"},{"DETAIL_TYPE":"LAST_ORDER","DETAIL_LABEL":"Siste bestilling","DETAIL_VALUE":"00.00.0000","DETAIL_FILTER":"2"},{"DETAIL_TYPE":"MENGE","DETAIL_LABEL":"Antall på vei inn","DETAIL_VALUE":"0.000 ","DETAIL_FILTER":"2"},{"DETAIL_TYPE":"LAST_COUNT","DETAIL_LABEL":"Siste lagertelling","DETAIL_VALUE":"00.00.0000","DETAIL_FILTER":"2"}]}

我想确保 DETAIL_TYPE":"ORIGINAL_PRICE -> DETAIL_VALUE 实际上有一个值（现在是 799.00 NOK）。但是我是否编写了一个 JSON 表达式来验证此节点在此表单上是否具有实际内容？

【问题讨论】：

标签： json extract jsonpath

【解决方案1】：

没有 JSON 表达式这样的东西。它是一种数据格式，而不是一种编程语言。如果你想测试任何关于它的东西，你必须从选择一种编程语言开始。

任何语言的基本步骤都是一样的：

解析 JSON
找到具有您想要的 DETAIL_TYPE 的对象
检查您关心的属性是否已在其上定义

这是你在 Perl 中的做法。

#!/usr/bin/env perl
use v5.16;
use strict;
use warnings;
use JSON;

my $json = q!{"modelpageStartData":{"WERKS":"2371","NAME1":"GAYLORD STORE","MATNR":"5405873","BISMT":"","EAN11":"","MAKTX":"LØPESKO ADIDAS","MEINS":"","BSTME":""},"modeltabReturnData":[],"modeltabArticleData":[{"DETAIL_TYPE":"MATNR","DETAIL_LABEL":"Varenummer i SAP","DETAIL_VALUE":"5405873","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"EAN","DETAIL_LABEL":"GTIN","DETAIL_VALUE":"4051936459253","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"SUPPLIER","DETAIL_LABEL":"Leverandør","DETAIL_VALUE":"G63942","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"SORTIMENT","DETAIL_LABEL":"Sortiment","DETAIL_VALUE":"P","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"ORIGINAL_PRICE","DETAIL_LABEL":"Ordinær pris","DETAIL_VALUE":"799.00 NOK","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"BSTME","DETAIL_LABEL":"Bestillingsenhet","DETAIL_VALUE":"","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"UNITS","DETAIL_LABEL":"","DETAIL_VALUE":"","DETAIL_FILTER":"1"},{"DETAIL_TYPE":"MATNR","DETAIL_LABEL":"Varenummer i SAP","DETAIL_VALUE":"5405873","DETAIL_FILTER":"2"},{"DETAIL_TYPE":"LAST_ORDER","DETAIL_LABEL":"Siste bestilling","DETAIL_VALUE":"00.00.0000","DETAIL_FILTER":"2"},{"DETAIL_TYPE":"MENGE","DETAIL_LABEL":"Antall på vei inn","DETAIL_VALUE":"0.000 ","DETAIL_FILTER":"2"},{"DETAIL_TYPE":"LAST_COUNT","DETAIL_LABEL":"Siste lagertelling","DETAIL_VALUE":"00.00.0000","DETAIL_FILTER":"2"}]}!;



# 1. Parse the JSON
my $data = JSON::from_json($json);

# 2. Find the object with the DETAIL_TYPE you want
my ($original_price) = grep { $_->{DETAIL_TYPE} eq "ORIGINAL_PRICE" } @{$data->{modeltabArticleData}};

# 3. Check that the property you care about is defined on it
if (defined $original_price->{DETAIL_VALUE}) {
    say "Defined";
} else {
    say "Not defined";
}

这假定每个 DETAIL_TYPE 都是唯一的，并且 ORIGINAL_PRICE 会有一个。如果其中任何一个假设不成立，您就需要进行额外的测试。

【讨论】：