terraform - 修复 Terraform 中的 "Interpolation-only expressions are deprecated"警告

Question

我升级到 Terraform v0.12.16，现在我收到了很多如下所示的消息:

Warning: Interpolation-only expressions are deprecated

  on ../modules/test-notifier/test_notifier.tf line 27, in resource "aws_sns_topic_policy" "default":
  27:   arn    = "${aws_sns_topic.default.arn}"

Terraform 0.11 and earlier required all non-constant expressions to be
provided via interpolation syntax, but this pattern is now deprecated. To
silence this warning, remove the "${ sequence from the start and the }"
sequence from the end of this expression, leaving just the inner expression.

Template interpolation syntax is still used to construct strings from
expressions when the template includes multiple interpolation sequences or a
mixture of literal strings and interpolations. This deprecation applies only
to templates that consist entirely of a single interpolation sequence.

有数百条这样的消息。有没有一种自动化的方法来修复它们？

Answer 1

更新插值如下:

subscription_id = "${var.subscription_id}"

到

subscription_id = var.subscription_id