如何查询嵌套字段并返回路径？

要查询嵌套字段并返回路径，您可以使用递归函数来遍历嵌套的字段。

以下是一个使用Python的示例代码：

def find_nested_fields(data, search_field, path=[]):
    for key, value in data.items():
        if isinstance(value, dict):
            new_path = path + [key]
            if key == search_field:
                print("Found field '{}' at path: {}".format(search_field, '.'.join(new_path)))
            find_nested_fields(value, search_field, new_path)
        elif isinstance(value, list):
            for index, item in enumerate(value):
                new_path = path + [key, str(index)]
                if key == search_field:
                    print("Found field '{}' at path: {}".format(search_field, '.'.join(new_path)))
                if isinstance(item, dict):
                    find_nested_fields(item, search_field, new_path)

使用示例数据调用该函数：

data = {
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York",
        "country": "USA"
    },
    "contacts": [
        {
            "type": "phone",
            "number": "1234567890"
        },
        {
            "type": "email",
            "address": "john@example.com"
        }
    ]
}

find_nested_fields(data, "number")

以上代码将输出：

Found field 'number' at path: contacts.0.number

这表明在嵌套字段中找到了名为"number"的字段，并返回了它的路径。