JQ 按键分组，合并值，然后展平对象

Question

使用以下输入：

# file1.json
{
  "uid": "1",
  "name": "jack"
}
{
  "uid": "2",
  "name": "jill"
}

# file2.json
{
  "fid": "a",
  "file": "sample1.txt",
  "uid": "1"
}
{
  "fid": "b",
  "file": "sample2.txt",
  "uid": "1"
}
{
  "fid": "c",
  "file": "sample3.txt",
  "uid": "2"
}

如何将name 键值对插入file2.json 中的对象。我试图得到的输出如下：

{
  "fid": "a",
  "file": "sample1.txt",
  "uid": "1",
  "name": "jack"
}
{
  "fid": "b",
  "file": "sample2.txt",
  "uid": "1",
  "name": "jack"
}
{
  "fid": "c",
  "file": "sample3.txt",
  "uid": "2",
  "name": "jill"
}

merge json objects with jq 和 join two json files based on common key with jq utility or alternative way from command line 上发布的解决方案似乎都只返回最后一个匹配对。见下文。

{"uid":"1","name":"jack","fid":"b","file":"sample2.txt"}
{"uid":"2","name":"jill","fid":"c","file":"sample3.txt"}

Answer 1

您将需要“啜饮”file1.json，例如通过调用 jq 如下：

jq -n -f merge.jq --slurpfile file1 file1.json file2.json

merge.jq 包含的地方：

INDEX($file1[]; .uid) as $dict
| inputs
| . + $dict[.uid]

定义索引

如果你的 jq 没有 INDEX/2，那么只需添加它的 def:

def INDEX(stream; idx_expr):
  reduce stream as $row ({}; .[$row|idx_expr|tostring] = $row);