Loop over object

[Trevor Hartman]

I looked in the docs, mailing list and GitHub issues, but couldn't find anything on looping over objects. Here's a made-up example of what I'm after:

local items = {a: 1, b: 2};

{

  [key + "-node"]: { name: value } 

  for [key,value] in items

}

I also tried:

{

  [item + "-node"]: {

    name: items[item]

  } for item in items

}

Possible? Thanks.

[Trevor Hartman]

Of course I find an example right after I post!

Noticed std.objectFields from https://github.com/google/jsonnet/blob/master/case_studies/fractal/service.jsonnet#L330

So my example would look like:

local items = {a: 1, b: 2};

{

  [item + "-node"]: {

    name: items[item]

  } for item in std.objectFields(items)

}

Hopefully that helps someone in the future.

🤘

[Dave Cunningham]

Thanks for posting the solution, this should be better documented!

Perhaps iterating over objects should be supported, as in Python.  On the other hand, what you're doing is really reflection so there's an argument it should be quite visible in the code that this is happening.

At any rate, I noticed that the current behavior is a weird error message so filed https://github.com/google/jsonnet/issues/121

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[Trevor Hartman]

Also noticed this issue: https://github.com/google/jsonnet/issues/119

Possibly related to be able to destructure objects as arrays of tuples (similar to how it works in Scala or Clojure), like my first attempt. That way you're not relying on reflection. It's also very concise:

{

  [key + "-node"]: { name: value } for [key,value] in items

}