Terraform 中的嵌套地图数据

Question

假设我有一个名为“env”的字符串类型变量（值可以是“dev”或“Production”）

使用以下数据，如何获取“dev”或“product”中第一个元素的setting1的值？

locals{
   environments = {
      dev = {
         "hello001" = {
            setting1 = "abc"
            setting2 = "def"
            setting3 = "ghi"
         }
         "hello002" = {
            setting1 = "jkl"
            setting2 = "mno"
            setting3 = "pqr"
         }
      }
      production = {
         "hello003" = {
            setting1 = "abc"
            setting2 = "def"
            setting3 = "ghi"
         }
         "hello004" = {
            setting1 = "jkl"
            setting2 = "mno"
            setting3 = "pqr"
         }
      }
   }
}

我尝试过

local.environments[var.env][0].setting1

但出现错误“该值没有任何索引”

Answer 1

首先，我收到的错误消息略有不同：

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\xe2\x94\x82 Error: Invalid index\n[...]\n\xe2\x94\x82 The given key does not identify an element in this collection value. An object only supports looking up attributes by name, not by numeric index.\n

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但我猜这是因为 Terraform 版本不同。我有1.0.7。

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解释/上下文

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尽管如此，问题正如Matt 在评论中提到的那样- Terraform HCL 中的地图不支持整数索引。[0]即你不能在地图上做。某些编程语言提供了这种可能性，而 Terraform 则不提供。

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看：

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locals {\n my_dictionary = {\n   "one" = 1\n   "two" = 2\n }\n}\n

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如果我尝试local.someMapping[0]它会失败并出现相同的错误。

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出路

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这取决于您想要如何访问 hello001、hello002 等。

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要么将最里面的地图更改为列表，例如

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locals{\n   environments = {\n      dev = [\n         {\n            setting1 = "abc"\n            setting2 = "def"\n            setting3 = "ghi"\n         },\n         {\n            setting1 = "jkl"\n            setting2 = "mno"\n            setting3 = "pqr"\n         }\n      ]\n      production = [\n         {\n            setting1 = "abc"\n            setting2 = "def"\n            setting3 = "ghi"\n         },\n         {\n            setting1 = "jkl"\n            setting2 = "mno"\n            setting3 = "pqr"\n         }\n      ]\n   }\n}\n\n

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然后你就可以local.environments["dev"][0].setting1

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...或坚持使用地图，但随后您需要以某种方式迭代地图，例如使用for_each为每个定义资源hello00x：

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locals{\n   environments = {\n      dev = {\n         "hello001" = {\n            setting1 = "ami-0c55b159cbfafe1f0"\n            setting2 = "t3.micro"\n         }\n         "hello002" = {\n            setting1 = "ami-01d7c2b5c4fc0218a"\n            setting2 = "m4.large"\n         }\n      }\n   }\n}\n\nresource "aws_instance" "my_server" {\n for_each = local.environments["dev"]\n \n ami = each.value.setting1\n instance_type = each.value.setting2\n\n tags = {\n  Name = each.key\n }\n}\n

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aws_instance这里我为两个问候分别定义了一个。

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