Terraform 0.12-从嵌套的for循环生成 map /对象

Question

作为Terraform 0.12 nested for loops的后续事件。我试图从嵌套循环中产生一个对象，但惨不忍睹:(

您将如何生产:

  Outputs:

  association-list = {
    "policy1" = "user1"
    "policy2" = "user1"
    "policy2" = "user2"
  }

从:

iam-policy-users-map = {
  "policy1" = [ "user1" ]
  "policy2" = [ "user1", "user2" ]
}

我尝试了以下多种变体:

variable iam-policy-users-map {
  default = {
    "policy1" = [ "user1" ]
    "policy2" = [ "user1", "user2" ]
  }
}

locals {
  association-map = merge({
    for policy, users in var.iam-policy-users-map : {
      for user in users : {
        policy => user
      }
    }
  })

output association-map {
  value = local.association-map
}

迄今为止，成功率为零。根据变化，仅设法获得以下信息:

Error: Invalid 'for' expression. Extra characters after the end of the 'for' expression.

Error: Missing attribute value. Expected an attribute value, introduced by an equals sign ("=").

Error: Invalid 'for' expression. Key expression is required when building an object.

Error: Missing key/value separator. Expected an equals sign ("=") to mark the beginning of the attribute value.

作为引用，以下代码可以生成 map 列表:

variable iam-policy-users-map {
  default = {
    "policy1" = [ "user1" ]
    "policy2" = [ "user1", "user2" ]
  }
}

locals {    
  association-list = flatten([
    for policy, users in var.iam-policy-users-map : [
      for user in users : {
        user   = user
        policy = policy
      }
    ]
  ])
}

output association-list {
  value = local.association-list
}

Outputs:

association-list = [ { "policy" = "policy1" "user" = "user1" }, { "policy" = "policy2" "user" = "user1" }, { "policy" = "policy2" "user" = "user2" }, ]

Answer 1

可以在https://github.com/hashicorp/terraform/issues/22263找到部分答案。
长话短说:首先这是一个愚蠢的尝试， map 不能包含重复的键。

但是，我仍然有兴趣了解如何从嵌套的for循环中生成 map 。参见上面的第二个代码示例，生成 map 列表。

编辑:上面链接的github问题上给出了完整的答案。

“(显然)这是一个无用的结构，但我想说明这是可能的:

locals {
  association-list = {
    for policy, users in var.iam-policy-users-map:
      policy => {      // can't have the nested for expression before the key!
        for u in users:
           policy => u...
      }
  }
}

Outputs:

association-list = {
  "policy1" = {
    "policy1" = [
      "user1",
    ]
  }
  "policy2" = {
    "policy2" = [
      "user1",
      "user2",
    ]
  }
}

”