json - jq - select objects with given key name

Question

I've got an arbitrary structure with many levels, etc. I need to select all objects that contain a key named updateDate. How do I do that with jq? I came up with one way but it also produces errors on invalid data types when it visits a leaf which I have to grep out:

jq 'recurse(.[]) | has("updateDate")' | grep -Fv error

I don't really understand how to also check for types or leaves and I suspect there is a simpler way to achieve what I want?

Answer 1

在 1.4 中，您可以：

jq '..|.updateDate?'

如果您坚持使用 1.3，您可以使用更长的程序，如下所示：

jq 'recurse(if type == "array" or type = "object" then .[] else empty end) | if type == "object" then .updateDate else empty end'

Answer 2

接受的答案也会null为每个没有密钥的对象生成。

对我有用的是：

jq '..|objects|.updateDate//empty'

该.updateDate//empty部分的意思是：如果.updateDate是null（或false），则完全跳过它。

false如果您希望您的密钥具有or的值，这当然是行不通的null。在这种情况下，使用这个：

jq '..|objects|select(has("updateDate"))|.updateDate'

Answer 3

未测试：怎么样jq 'recurse(.[]?) | objects | has("updateDate")'？