Reference several aws_iam_policy_document data sources created with for

I want to create multiple aws_iam_policy_document resources with for_each, to be later assumed by several roles, as follows:

# Policy to allow services to assume the role
data "aws_iam_policy_document" "this" {
  for_each           = var.lambda_configuration
  statement {
    actions = ["sts:AssumeRole"]

    principals {
      type = "Service"

      identifiers = [
        "lambda.amazonaws.com",
        "apigateway.amazonaws.com",
      ]
    }
  }
}

# IAM role for executing the Lambda function
resource "aws_iam_role" "this" {
  for_each           = var.lambda_configuration
  name               = "my_lambda_${each.key}_Executor_Role"
  description        = "Role for executing my_lambda-${each.key} function"
  assume_role_policy = data.aws_iam_policy_document.assume_role_policy_[each.key].json
}

How should I interpolate this

assume_role_policy = data.aws_iam_policy_document.assume_role_policy_[each.key].json

to make the correct matching with the roles?

CodePudding user response：

The correct syntax:

data.aws_iam_policy_document.this[each.key].json

Note that this is not interpolation, as you mentioned in your question. It is just a value lookup. And I have no idea where you got assume_role_policy_ from, but that is not valid HCL syntax.