Terraform 0.12 - 从嵌套 for 循环生成地图/对象

作为后续Terraform 0.12 嵌套 for 循环 https://stackoverflow.com/questions/56047306/terraform-0-12-nested-for-loops/57280420#57280420。我试图从嵌套循环中生成一个对象，但惨败:(

您将如何制作：

  Outputs:

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

From:

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

我尝试过多种变体：

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
}

到目前为止成功率为零。根据变化只能得到以下内容：

错误：“for”表达式无效。 “for”表达式末尾后的额外字符。

错误：缺少属性值。 需要一个属性值，由等号 (“=”) 引入。

错误：“for”表达式无效。 构建对象时需要键表达式。

错误：缺少键/值分隔符。需要等号（“=”） 标记属性值的开始。

作为参考，以下代码能够生成地图列表：

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:

关联列表 = [ { “政策”=“政策1” “用户”=“用户1”}，{ “政策”=“政策2” “用户”=“用户1”}，{ “政策”=“政策2” “用户” = “用户2” }, ]

部分答案可以在以下位置找到：https://github.com/hashicorp/terraform/issues/22263 https://github.com/hashicorp/terraform/issues/22263。 长话短说：这从一开始就是一个愚蠢的尝试，地图不能包含重复的键。

然而，我仍然有兴趣了解如何从嵌套的 for 循环生成地图。请参阅上面的第二个代码示例，生成地图列表。

编辑：上面链接的 github 问题给出了完整的答案。

“这（显然）是一个无用的结构，但我想说明它是可能的：

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",
    ]
  }
}

"