地形对象和嵌套循环

Question

我正在尝试转换map(object)，但是当涉及到更复杂的循环用例时，我觉得Terraform文档有点缺乏。

有人能写一个for循环，使output.solution等于local.desired_output吗？

locals {
  
  users = {
    user1 = {
      teams = {
        team1 = "member"
        team2 = "admin"
      }
    }
    
    user2 = {
      teams = {
        team1 = "member"
      }
    }
  }
  
  desired_output = {
    user1_team1 = {
      user = "user1"
      team = "team1"
      role = "member"
    }
    
    user1_team2 = {
      user = "user1"
      team = "team2"
      role = "admin"
    }
    
    user2_team1 = {
      user = "user2"
      team = "team1"
      role = "member"
    }
  }
  
}

output "solution" {
  value = ???
}

编辑：

找到了解决方案，但是很丑：

locals {

  temp_output = flatten([
    for user, data in local.users : [
      for team, role in data.teams : {
        join("-", [user, team]) = {
          "user" = user
          "team" = team
          "role" = role
        }
      }
    ]
  ])

}

output "solution" {
  value = {
    for tuple in local.temp_output : keys(tuple)[0] => values(tuple)[0]
  }
}

有人可以建议一种更清洁的方法吗？

编辑2：

在马丁·阿特金斯（Martin Atkins）的评论中，清洁度是主观的： 我对解决方案不满意的是，它需要将循环包装在各种括号中，然后使用另一个循环将其拆包。我想做的是直接从嵌套循环创建所需的输出，而无需执行创建元组列表的中间步骤。

如果可以的话，这样的事情会更清洁：

# Does not work
output = {
  for user, data in local.users :
    for team, role in data.teams :
      join("-", [user, team]) => {
        "user" = user
        "team" = team
        "role" = role
      }
}

我不完全理解上述原因为何不起作用；似乎您无法进行嵌套循环，除非内部循环包含在[]或{}中，然后需要更多代码才能展开，以达到for_each友好的状态对象结构。