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TerraformでDynamoDBに一気にデータを突っ込みたい時のやつ

Last updated at Posted at 2024-05-02

結論から

TerraformでMapをListにして突っ込む方法があまり検索に引っかからないのもあり、残しておくことにした。

main.tf
resource "aws_dynamodb_table" "example" {
  name         = "ExampleTable"
  billing_mode = "PAY_PER_REQUEST"
  hash_key     = "PartitionKey"
  range_key    = "SortKey"

  attribute {
    name = "PartitionKey"
    type = "S"
  }

  attribute {
    name = "SortKey"
    type = "S"
  }

  tags = {
    Name = "ExampleTable"
  }
}

locals {
  list = [
    { PartitionKey = { S = "hoge" }, SortKey = { S = "1" }, Content = { S = "サンプルデータ1" } },
    { PartitionKey = { S = "hoge" }, SortKey = { S = "2" }, Content = { S = "サンプルデータ2" } },
    { PartitionKey = { S = "hoge" }, SortKey = { S = "3" }, Content = { S = "サンプルデータ3" } },
  ]
}

resource "aws_dynamodb_table_item" "example" {
  for_each   = { for i in local.list : "${i.PartitionKey.S}#${i.SortKey.S}" => i }
  table_name = aws_dynamodb_table.example.name
  hash_key   = aws_dynamodb_table.example.hash_key
  range_key  = aws_dynamodb_table.example.range_key
  item       = jsonencode(each.value)
}

解説

for_each"${i.PartitionKey.S}#${i.SortKey.S}"を渡してる理由はDynamoDBの使用上PartitionKeySortKeyを合わせてPrimaryのためMapのキーで文字列結合させているためである。

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