for loop over function that yields JSON object containing multiple fields?

[Preston Podaril]

The subject might not be the best, I am not exactly sure the best description for what I need and am having problems with.

I am struggling to figure out what I need to do to work out an issue I am having. What I currently have is a function that returns a JSON object containing multiple fields.

For example:

  foo(x):: {

    [x + i]: {

        .....

    } for i in ["1", "2"]

  },

I then want to for loop over that and really just concatenate all of the output of that into one object.

  local items = ["a", "b", "c"],

  foo(item) for item in items,

But trying to execute this simply throws the error: "STATIC ERROR: ......: Object comprehension can only have one field."

The results I am expecting would be the equivalent of:

  foo("a") + foo("b") + foo("c")

However, I need a way to do this programmatically. Hopefully I am just missing something subtle (or obvious) that helps me accomplish what I am needing.

Thanks,

Preston

[Dave Cunningham]

Sounds like you want std.join({}, [foo(x) for x in ['a', 'b', 'c']]) except currently that's not allowed as join is restricted to arrays and strings.  Here's a cut down version of std.join() you can put in your jsonnet file or in a util library or whatever:

local join_objects(objs) = 

    local aux(arr, i, running) =

        if i >= std.length(arr) then

            running

        else

            aux(arr, i + 1, running + arr[i]) tailstrict;

    aux(objs, 0, {});

{

  foo(x):: {

    [x + i]: {

        data: "x = %s and i = %s" % [x, i],

    } for i in ["1", "2"]

  },

    

  local items = ["a", "b", "c"],

  joined: join_objects([self.foo(item) for item in items]),

} 

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[Dave Cunningham]

Taking a step back, you can also just do this :)

{

  local items = ["a", "b", "c"],

  joined: {

    [x + i]: {

      data: "x = %s and i = %s" % [x, i],

    } for i in ["1", "2"] for x in items

  }

}

[Preston Podaril]

Thanks, the first option you gave me is exactly what I was looking for.

The latter one I had already done actually, several times to create a bunch of different functions for creating these objects using different forms of iterations. However the functions are much more complex than the example, with 20+ available function parameters possible, and since I already had one that provided all of the functionality I needed, I was hoping to be able to reuse it, so it would be easier to maintain the code base later.

I had thought of creating an array of these objects, but I was getting stuck in trying to figure out how to convert that into a plain object (I was hoping the join function might do that also, but I looked at it and saw it was only useful for arrays and strings). The key I was missing was making use of a recursive function call to iterate through all of the items in the array.

Thanks for you quick help!!

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