要通过删除空对象进行映射的 Terraform 元组？

Question

我正在尝试为其他资源中的 for_each 循环创建局部变量，但无法按预期制作局部映射。

以下是我试过的。 (地形 0.12)

预期映射到循环

temple_list = { "test2-role" = "test-test2-role", ... }

ma​​in.tf

locals {
  tmpl_list = flatten([ 
    for role in keys(var.roles) : {
      for tmpl_vars in values(var.roles[role].tmpl_vars) : 
        role => "test-${role}" if tmpl_vars == "SECRET"
    }
  ])
}

output "tmpl_list" {
  value = local.tmpl_list
}

variable "roles" {
    type = map(object({
        tmpl_vars = map(string)
        tags = map(string)
    }))
    
    default = {
        "test-role" = {
            tmpl_vars = {test = "y"}
            tags = { test = "xxx"}
        }
            "test2-role" = {
            tmpl_vars = { token = "SECRET" }
            tags = {}
        }
        "test3-role" = {
            tmpl_vars = {test = "x"}
            tags = {}
        }
    }
}

错误来自合并

    | var.roles is map of object with 3 elements

Call to function "merge" failed: arguments must be maps or objects, got
"tuple".

没有合并

locals {
  tmpl_list = flatten([ 
    for role in keys(var.roles) : {
      for tmpl_vars in values(var.roles[role].tmpl_vars) : 
        role => "test-${role}" if tmpl_vars == "SECRET"
    }
  ])
}

output "tmpl_list" {
  value = local.tmpl_list
}

variable "roles" {
    type = map(object({
        tmpl_vars = map(string)
        tags = map(string)
    }))
    
    default = {
        "test-role" = {
            tmpl_vars = {test = "y"}
            tags = { test = "xxx"}
        }
            "test2-role" = {
            tmpl_vars = { token = "SECRET" }
            tags = {}
        }
        "test3-role" = {
            tmpl_vars = {test = "x"}
            tags = {}
        }
    }
}

没有合并的结果

tmpl_list = [
  {},
  {
    "test2-role" = "test-test2-role"
  },
  {},
]

我尝试了其他函数，例如 tomap()，但它似乎对我不起作用。(我也不确定为什么会创建空的。)

如何将这个元组转换为没有空元组的映射？

Answer 1

您可以分两步完成:

1. 将其转换为过滤后的对象列表:

locals {  
  result = flatten([
    for role, role_value in var.roles: [
      for tmpl_vars in role_value.tmpl_vars: {
        key = role
        value = "test-${role}"
      } if tmpl_vars == "SECRET"
    ]
  ])
}

local.result 将具有以下值:

[
  {
    "key" = "test2-role"
    "value" = "test-test2-role"
  },
]

1. 然后很容易用for把它转换成 map :

my_map = { for item in local.result: item.key => item.value }

给出:

{
  "test2-role" = "test-test2-role"
}