javascript 按属性值查找嵌套数据中的对象（使用 JSONPath）
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Find object in nested data by property value (with JSONPath)
提问by alexandernst
I have this test data:
我有这个测试数据：
[
{
id: 1,
l: 'a',
sub: [
]
},
{
id: 2,
l: 'b',
sub: [
{
id: 4,
l: 'd'
},
{
id: 5,
l: 'e'
},
{
id: 6,
l: 'f',
sub: [
{
id: 7,
l: 'g'
}
]
}
]
},
{
id: 3,
l: 'c',
sub: []
}
];
And I'm trying to get the path of the object with id: 7. I tried quite some JSONPath queries, but I just can't seem to fiind out how to make JSONPath iterate over all subkeys and search in there.
我正在尝试使用id: 7. 我尝试了相当多的 JSONPath 查询，但我似乎无法找出如何让 JSONPath 遍历所有sub键并在其中进行搜索。
How can I match the object with id: 7?
我怎样才能匹配对象id: 7？
Here is my testing plunkr: http://plnkr.co/edit/RoSeRo0L1B2oH3wC5LdU?p=preview
这是我的测试 plunkr：http://plnkr.co/edit/RoSeRo0L1B2oH3wC5LdU?p=preview
回答by Duncan
This query should work for what you are doing:
此查询应该适用于您正在执行的操作：
$..[?(@.id==7)]
You need to remove the id just after the $..as you want to select the whole object, not just the id. You were also missing the square brackets around the query.
您需要在 id 之后删除 id，$..因为您要选择整个对象，而不仅仅是 id。您还缺少查询周围的方括号。
This query brings back the following result set:
此查询带回以下结果集：
[
{
"id": 7,
"l": "g"
}
]
If you just want to retrieve the value of the l property (since you already know the id), you can easily do that as well. Just add .lat the end of the query:
如果您只想检索 l 属性的值（因为您已经知道 id），您也可以轻松地做到这一点。只需.l在查询的末尾添加：
$..[?(@.id==7)].l
This brings back the following result set:
这将带回以下结果集：
[
"g"
]
I tested the first query out here using this online json path tester tool and using your plunker: http://www.jsonquerytool.com/sample/jsonpathfilterallbypropertyvalue
我在这里使用此在线 json 路径测试器工具并使用您的 plunker 测试了第一个查询：http: //www.jsonquerytool.com/sample/jsonpathfilterallbypropertyvalue
