在 Terraform 中通过 Flatten 创建地图

我的问题如下 - 我有一个类似下面的本地代码块。我需要根据这些值创建一个 Map（这些值在多个地方使用）。

locals {
  object = {
    1 = {
      name = "val1"
      keys = ["val1"]
    }
    2 = {
      name = "val2"
      keys = ["val2", "val3", "val4"]
    }
  }
  associations = flatten(
    [
      for obj in local.object : [
        for association_key in obj.keys : {
          "${obj.name}-${association_key}" = {
            key             = obj.name
            association_key = association_key
          }
        }
      ]
    ]
  )
}

当我运行 terraform 计划并输出上述内容时，我得到：

testing = [
      + {
          + val1-val1 = {
              + association_key = "val1"
              + key             = "val1"
            }
        },
      + {
          + val2-val2 = {
              + association_key = "val2"
              + key             = "val2"
            }
        },
      + {
          + val2-val3 = {
              + association_key = "val3"
              + key             = "val2"
            }
        },
      + {
          + val2-val4 = {
              + association_key = "val4"
              + key             = "val2"
            }
        },
    ]

然而我需要得到的东西是这样的：

testing = [
          + val1-val1 = {
              + association_key = "val1"
              + key             = "val1"
            }
          + val2-val2 = {
              + association_key = "val2"
              + key             = "val2"
            }
          + val2-val3 = {
              + association_key = "val3"
              + key             = "val2"
            }
          + val2-val4 = {
              + association_key = "val4"
              + key             = "val2"
            }
    ]

原因是对象的键值有很多重复，并且映射中需要有一个唯一的值。

我已尝试此处的解决方案- 但我无法创建我需要的地图。