Terraform 转换为列表：“对资源类型的引用必须后跟至少一个属性访问，指定资源名称”

Question

我的 terraform 代码中有一个属性“my_code”。目前，用户提供这样的输入

my_code = "15"

但我们希望将其从数字更改为列表，以便用户可以像上面一样提供他们现在正在执行的数字（以便保持向后兼容），或者他们可以提供如下所示的数字列表

my_code = ["15", "20"]

目前我的 terraform 代码如下所示

my_code = lookup(all_operations, "my_code", null)

我正在考虑做类似下面的事情，以便它同时采用这两个值。如果它是一个数字，它会将其转换为一个列表，如果它已经是一个列表，它会保持原样。

my_code = can(list, lookup(all_operations, "my_code", null)) ? [lookup(all_operations, "my_code", null)] : lookup(all_operations, "my_code", null)

但是由于这个错误，我遇到了以下错误

my_code = can(list, lookup(all_operations, "my_code", null)) ? [lookup(all_operations, "my_code", null)] : lookup(all_operations, "my_code", null)
│ 
│ A reference to a resource type must be followed by at least one attribute
│ access, specifying the resource name

尝试如下

my_code = type(lookup(all_operations, "my_code", null)) == list(any) ? lookup(all_operations, "my_code", null) : [lookup(all_operations, "my_code", null)]

遇到同样的错误

my_code = type(lookup(all_operations, "my_code", null)) == list(any) ? lookup(all_operations, "my_code", null) : [lookup(all_operations, "my_code", null)]
│ 
│ A reference to a resource type must be followed by at least one attribute
│ access, specifying the resource name

任何帮助将不胜感激。预先感谢

Answer 1

您可以使用 flatten 为这两种情况生成元素数组：

• my_code

  包含单个值，例如

  "15"

• my_code

  包含一个数组，例如

  ["15", "20"]

示例：

variable "my_code" {
}

locals {
  # square brackets [] are required in order to convert var.my_code to an array
  #
  # If var.my_code is already an array that's ok, as flatten(...) will return 
  # a flattened sequence of elements for single or multi-dimensional arrays
  my_codes = flatten([var.my_code])
}

output "my_codes" {
  value = local.my_codes
}

使用单个字符串值 (

terraform plan

) 运行

mycode = "15"

：

Changes to Outputs:
  + my_codes = [
      + "15",
    ]

使用字符串数组 (

terraform plan

) 运行

mycode = ["15", "20"]

：

Changes to Outputs:
  + my_codes = [
      + "15",
      + "20",
    ]