【发布时间】：2020-09-14 06:58:28
【问题描述】：
我有 2 个 JSON 文件，我想根据另一个更新其中一个。 更具体地说，如果一个特定的键：值对在文件之间匹配，我想更新另一个（并且只有一个）键：值对。
a.json 如下所示：
[
{"i":"1234","f":"123","a":"0"},
{"i":"1235","f":"123","a":"0"},
{"i":"1236","f":"123","a":"0"},
{"i":"1237","f":"123","a":"0"},
{"i":"1238","f":"123","a":"0"}
]
b.json 如下：
[
{"i":"1234","f":"555","a":"1"},
{"i":"1235","f":"555","a":"1"},
{"i":"1236","f":"555","a":"1"},
{"i":"1237","f":"555","a":"1"},
{"i":"1238","f":"555","a":"1"}
]
我想更新 b.json，以便如果 b.json 的“i”值与 a.json 的“i”值匹配，则“f”的值将替换为 a.json 的值。 IE。我希望 b.json 看起来像这样：
[
{"i":"1234","f":"123","a":"1"},
{"i":"1235","f":"123","a":"1"},
{"i":"1236","f":"123","a":"1"},
{"i":"1237","f":"123","a":"1"},
{"i":"1238","f":"123","a":"1"}
]
所以要明确一点，只有 f 值必须被替换，而不是 a 的值。
我找到了这个部分解决方案：
1) 创建一个名为 update.jq 的文件，这样：
reduce keys[] as $k (.; if $a|has($k) then .[$k] = $a[$k] else . end)
2) 运行：
jq --argfile a a.json -f a.jq b.json
这为我提供了 f 和 a 都已更新的情况但我只想更新 f。如何确保只有 f 得到更新？
[
{"i":"1234","f":"555","a":"0"},
{"i":"1235","f":"555","a":"0"},
{"i":"1236","f":"555","a":"0"},
{"i":"1237","f":"555","a":"0"},
{"i":"1238","f":"555","a":"0"}
]
【问题讨论】：
-
只是为了确认您只是想使用 jq 获得结果？
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看看 -> stackoverflow.com/questions/60228327/… 。问题陈述与您的相似
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@khari-sing 是的，我是。