IAM User Variable in Terraform

variable_user_iam.tf

variable "iam_user" {
  default     = "candost"
  description = "My AWS IAM user"
}

resource "aws_iam_user" "candost" {
  name = "${var.iam_user}-${terraform.workspace}"
  path = "/"
}

resource "aws_iam_user_policy" "candost_policy" {
  name_prefix = "${var.iam_user}-${terraform.workspace}-"
  user        = "${aws_iam_user.candost.name}"

  policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "dynamodb:*",
      "Resource": [
        "arn:aws:dynamodb:eu-west-1:113608568902:table/MyTable"
      ]
    }
  ]
}
EOF
}