Terraform - if语句选择适当的变量

variable "environment" {
  description = "The environment (dev, prod)"
  type        = string
  default     = "dev"
}

variable "database_server_dev" {
  description = "The database server for dev environment"
  type        = string
  default     = "dev-db-server"
}

variable "database_server_prod" {
  description = "The database server for prod environment"
  type        = string
  default     = "prod-db-server"
}

resource "aws_instance" "database" {
  ami           = "ami-12345678"
  instance_type = "t2.micro"
  # 使用if语句根据环境选择不同的数据库服务器
  # 如果环境是dev，则使用database_server_dev变量的值
  # 如果环境是prod，则使用database_server_prod变量的值
  tags = {
    Name = if var.environment == "dev" then var.database_server_dev else var.database_server_prod
  }
}