Terraform: assigning `data.aws_availability_zones.names` to availability_zones

[cemo]

I could not be sure but I would like to share my situation.

aws_availability_zones.names is a list according to [documentation]. But I can not assign into aws_elb.availability_zones

data "aws_availability_zones" "available" {}

resource "aws_elb" "elb" {
  availability_zones = "${data.aws_availability_zones.available.names}"
  ////
}

Is this a bug?

[cemo]

seems bracket are required but I did not understand why it is required.

availability_zones = ["${data.aws_availability_zones.available.names}"]

[hashibot[bot]]

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