output map using lists

[Andy]

It seems like I am trying to do something that is not possible but I thought I would ask here since I am new to terraform.

I have this output that I want to consume in a module. If I try to access this in any way with the lookup function I will receive the errors:

lookup: lookup() may only be used with flat maps, this map contains elements of type list

output "test" {
  value = "${
    map(
      "test", ["one","two","three"]
    )
  }"
}

Is this just simply not possible or am I missing the proper way to access a list index with the lookup function?


Thanks
Andy

[David Adams]

lookup() can only return a string. So your map's value will need to be a string rather than a list. You can work around this by using commas (or something else) as a separator, then splitting:

    "${element(split(",",lookup(module.mod.test, "test")),count.index)}"

That may not be exactly right, but hopefully conveys the idea. This is an area that has gotten a lot of work, but is clearly pretty complicated to implement, so often you have to resort to what feel like hacks. But it's way better than it used to be :)

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[Andy]

Ok I get it so one other thing...

Since I have tried to use a variable inside of this every which way and it will not work, can I assume it is also impossible?
${module.namespace.${var.test}}

So for example that is why I wanted to use the map lookup function instead of defining a bunch out individual outputs that return lists like so:

output "test" {
  value = ["one","two","three"]
}

#and can access like this
${module.namespace.test}[0]}

On Tuesday, November 8, 2016 at 12:41:30 PM UTC-5, David Adams wrote:

lookup() can only return a string. So your map's value will need to be a string rather than a list. You can work around this by using commas (or something else) as a separator, then splitting:

    "${element(split(",",lookup(module.mod.test, "test")),count.index)}"

That may not be exactly right, but hopefully conveys the idea. This is an area that has gotten a lot of work, but is clearly pretty complicated to implement, so often you have to resort to what feel like hacks. But it's way better than it used to be :)

On Tue, Nov 8, 2016 at 10:56 AM, Andy <andys...@comcast.net> wrote:

It seems like I am trying to do something that is not possible but I thought I would ask here since I am new to terraform.

I have this output that I want to consume in a module. If I try to access this in any way with the lookup function I will receive the errors:

lookup: lookup() may only be used with flat maps, this map contains elements of type list

output "test" {
  value = "${
    map(
      "test", ["one","two","three"]
    )
  }"
}

Is this just simply not possible or am I missing the proper way to access a list index with the lookup function?


Thanks
Andy

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