'jq error when using if then else with scan

I have json:

{
  "apiVersion": "projectcalico.org/v3",
  "kind": "NetworkPolicy",
  "metadata": {
    "name": "allow-tcp-6379",
    "namespace": "production"
  },
  "spec": {
    "selector": "all()",
...
}

I select the fields I need with the command jq 'if .spec.selector == "all()" then "{}" else (scan("([0-9A-Za-z_]+) == '([0-9A-Za-z_]+)") | {(.[0]): .[1]}) end | {selector: .}'

But if I change the field to .spec.selector: "app =='nginx'" then I get an error - jq: error (at <stdin>:39): object ({"apiVersio...) cannot be matched, as it is not a string exit status 5

How to fix this?

jqplay: https://jqplay.org/s/7zS1CTHM69

jq


Solution 1:[1]

You're applying scan to the wrong thing.

if .spec.selector == "all()" then
   "{}"
else
   .spec.selector | 
   scan("([0-9A-Za-z_]+) == '([0-9A-Za-z_]+)") |
   { (.[0]): .[1] }
end

This simplifies to

.spec.selector |
if . == "all()" then
   "{}"
else
   scan("([0-9A-Za-z_]+) == '([0-9A-Za-z_]+)") |
   { (.[0]): .[1] }
end

It seems weird that you output a string in one path and an object in the other. Is this correct?

In addition to not specifying what you want from the three alternatives (all(), x == 'y', other), you did not specify what output from the overall program, so it's not clear how this should be incorporated into your program.

Sources

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Source: Stack Overflow

Solution Source
Solution 1

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