true 和 false 结果表达式必须具有一致的类型。给定的表达式分别是字符串和数字的列表

Question

我正在尝试使用 terraform 代码创建中转网关 VPC 附件，但是，当我执行 terraform 计划时出现以下错误；\nterraform 版本为 0.12

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错误：-

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\xe2\x94\x82 Error: Inconsistent conditional result types\n\xe2\x94\x82\n\xe2\x94\x82   on vpn-dynamic\\main.tf line 67, in resource "aws_ec2_transit_gateway_vpc_attachment" "tgw_vpc_attachment":\n\xe2\x94\x82   67:   subnet_ids         = lower(var.transit_gateway) == "enabled" ? var.tgw_subnet_ids : 0\n\xe2\x94\x82     \xe2\x94\x9c\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\xe2\x94\x80\n\xe2\x94\x82     \xe2\x94\x82 var.tgw_subnet_ids is a list of string, known only after apply\n\xe2\x94\x82     \xe2\x94\x82 var.transit_gateway is a string, known only after apply\n\xe2\x94\x82\n\xe2\x94\x82 The true and false result expressions must have consistent types. The given expressions are list of      \n\xe2\x94\x82 string and number, respectively.\n

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main.tf:-

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resource "aws_ec2_transit_gateway_vpc_attachment" "tgw_vpc_attachment" {\n  count              = lower(var.transit_gateway) == "enabled" ? 1 : 0\n  subnet_ids         = lower(var.transit_gateway) == "enabled" ? var.tgw_subnet_ids : 0\n  transit_gateway_id = lower(var.transit_gateway) == "enabled" ? var.tgw_id : 0\n  vpc_id             = lower(var.transit_gateway) == "enabled" ? var.vpc_id : 0\n}\n

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变量.tf:-

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variable "transit_gateway" {\n  type        = string\n  description = "Whether to create Transit gateway or not"\n  default     = "ENABLED"\n}\nvariable "tgw_subnet_ids" {\n  type        = list(string)\n  description = "Transit gateway subnet Ids"\n  default     = ["subnet-12345", "subnet-54321"]\n}\nvariable "vpc_id" {\n  type        = string\n  description = "VPC Id"\n  default     = "vpc-abc123"\n}\nvariable "tgw_id" {\n  type        = string\n  description = "TGW id"\n  default     = "tgw-12345"\n}\n

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在这里，我尝试使用变量“tgw_subnet_ids”作为列表（字符串）以及资源“tgw_vpc_attachment”中的条件，但它不起作用。

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Answer 1

我相信，terraform 正在寻找的是 True 和 False 评估双方的一致类型。

因此，在您的代码中，正确的计算返回列表类型var.tgw_subnet_ids，错误的计算仅返回整数0。正如您所看到的，两者都不匹配，并且 terraform 出现错误。

如果你想传递 list 的 null 值，你可以使用nulltype https://www.terraform.io/docs/language/expressions/types.html#null

resource "aws_ec2_transit_gateway_vpc_attachment" "tgw_vpc_attachment" {
  count              = lower(var.transit_gateway) == "enabled" ? 1 : 0
  subnet_ids         = lower(var.transit_gateway) == "enabled" ? var.tgw_subnet_ids : null
  transit_gateway_id = lower(var.transit_gateway) == "enabled" ? var.tgw_id : 0
  vpc_id             = lower(var.transit_gateway) == "enabled" ? var.vpc_id : 0
}