如何将顶层Schedules属性值合并到Servers数组的每个项中？

需求说明 #

现有一份JSON配置，其中顶层的"Schedules"作为"Servers"数组中每个服务器项的默认调度配置，服务器项内的"Schedules"会覆盖默认配置的对应字段。需要将顶层默认配置与每个服务器项的自定义配置合并，用合并后的结果替换项内的"Schedules"。

示例输入JSON #

{
    "Schedules": {
        "Days": [
            "Monday",
            "Tuesday",
            "Wednesday",
            "Thursday",
            "Friday",
            "Saturday",
            "Sunday"
        ],
        "Times": ["8:00 AM", "9:00 AM", "10:00 AM"]
    },
    "Servers": [
        {
            "Name": "Test",
            "Schedules": {
                "Days": [
                    "Monday",
                    "Tuesday",
                    "Wednesday",
                    "Thursday",
                    "Friday"
                ],
                "Times": [
                    "8:30 AM",
                    "1:30 PM",
                    "5:00 PM"
                ]
            }
        },
        {
            "Name": "Staging",
            "Schedules": {
                "Times": [
                    "5:00 PM"
                ]
            }
        }
    ]
}

尝试的无效命令 #

jq '.Servers |= map(. + {"Schedules": .Schedules})'

该命令中引用的.Schedules是服务器项内的字段，而非顶层的默认配置，因此无法实现合并效果。

期望输出结果 #

[
    {
        "Name": "Test",
        "Schedules": {
            "Days": [
                "Monday",
                "Tuesday",
                "Wednesday",
                "Thursday",
                "Friday"
            ],
            "Times": [
                "8:30 AM",
                "1:30 PM",
                "5:00 PM"
            ]
        }
    },
    {
        "Name": "Staging",
        "Schedules": {
            "Days": [
                "Monday",
                "Tuesday",
                "Wednesday",
                "Thursday",
                "Friday",
                "Saturday",
                "Sunday"
            ],
            "Times": [
                "5:00 PM"
            ]
        }
    }
]

正确的JQ命令 #

jq '($default = .Schedules) | .Servers |= map(.Schedules = $default + .Schedules)' input.json

命令解释 #

1. ($default = .Schedules)：先将顶层的默认Schedules配置存入变量$default，方便后续引用。
2. .Servers |= map(...)：对Servers数组进行遍历处理。
3. .Schedules = $default + .Schedules：将当前服务器项的Schedules替换为默认配置与自身配置的合并结果——JQ中对象合并时，后面的对象（项内自定义配置）会覆盖前面对象（默认配置）的同名字段，正好符合需求。

内容的提问来源于stack exchange，提问作者eSPiYa