"Ambiguous attribute key" error after updating to terraform version 0.12.26

user_6553195 0
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After terraform version update from 0.11 to 0.12.26, I'm seeing error with lookup and list of values inside map.

variable "foo" {
  type = map
}


foo = {
  x.y = "bar"
}

I have a map "foo" as variable type (map) and then i have key-value pair in map with x.y = "bar". In lookup, I'm trying to read value of x.y as,

lookup(var.foo, x.y)

with this, I'm getting error,

Error: Ambiguous attribute key

  on line 13:
  13:   x.y = "bar"

If this expression is intended to be a reference, wrap it in parentheses. If
it's instead intended as a literal name containing periods, wrap it in quotes
to create a string literal.

can someone help?

terraform0.12+ terraform-provider-aws terraform
1 Answers

If you want to have a map key that contains a dot character . then you must write the key in quotes, so Terraform can see that you intend to produce a string containing a dot rather than to use the value of the y attribute of variable x:

foo = {
  "x.y" = "bar"
}

Likewise, to access that element you'll need to quote the key in the index expression, like foo["x.y"]. You could also potentially use lookup(foo, "x.y") -- still with the quotes -- but that approach is deprecated in Terraform 0.12 because foo["x.y"] has replaced it as the main way to access an element from a map value.

user_2818480
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