I am trying to write a rule but am running into an issue. I managed to extract the following from as my input:

myData:= [{"Key": "use", "Value": "1"}, {"Key": "use", "Value": "2"}, {"Key": "att1", "Value": "3"}]

I am trying to count the amount of times a key with the value use appears. However when I do:

p := {keep| keep:= myData[_]; myData.Key == "use"}

I assumed this would create a listing of all I would like to keep but the playground errors with:

1 error occurred: policy.rego:24: rego_type_error: undefined ref: data.play.myData.Key
    data.play.myData.Key

I hoped I could list them in p and then do count(p) > 1 to check if more that one is listed.

CodePudding user response：

In your set comprehension for p, you're iterating over the objects in myData, assigning each element to keep. Then, you assert something on myData.Key. I think what you're looking for is

p := {keep| keep := myData[_]; keep.Key == "use"}

Be aware that it's a set comprehension, so p would be the same for these two inputs:

myData:= [{"Key": "use", "Value": "1"}]
myData:= [{"Key": "use", "Value": "1"}, {"Key": "use", "Value": "1"}]

You could use an array comprehension (p := [ keep | keep := ... ]) if that's not what you want.