Adding multiple DynamoDB set items through terraform - amazon-web-services

Question

terraform version: 0.12.20
I wanted to add multiple items with set datatype in terraform, I went through the link where an example has shown how to add simple data type as String but it fails to add with Set
Below is the code that I am testing
resource "aws_dynamodb_table_item" "items" {
hash_key = "key"
table_name = "test"
for_each = {
"72" = {
test = ["114717","2"],
test1 = []
},
"25" = {
test = ["114717"],
test1 = []
}
}
item = <<EOF
{
"key": {"S": "${each.key}"},
"test": {"SS": "${each.value.test}"},
"test1": {"SS": "${each.value.test1}"}
}
EOF
}
However, it fails with Cannot include the given value in a string template: string required.
I tried something like
resource "aws_dynamodb_table_item" "items" {
hash_key = "key"
table_name = "test"
for_each = {
"72" = {
test = "114717,2",
test1 = ""
},
"25" = {
test = "114717",
test1 = ""
}
}
item = <<EOF
{
"key": {"S": "${each.key}"},
"test": {"SS": ["${each.value.test}"]},
"test1": {"SS": ["${each.value.test1}"]}
}
EOF
}
This fails to differentiate "114717,2" as two different items
In the second example, I have even tried the below section too
{
"key": {"S": "${each.key}"},
"test": {"SS": "${split(",",each.value.test)}"},
"test1": {"SS": "${split(",",each.value.test1)}"}
}
This also fails with Cannot include the given value in a string template: string required.
I am expecting to be able to split the values into array ["114717","2"]. This will help me to store the values as Set in DynamoDB

Answer 1

Your item should be valid json. To achieve that, you can use jsonencode:
resource "aws_dynamodb_table_item" "items" {
hash_key = "key"
table_name = "GameScores"
for_each = {
"72" = {
test = ["114717","2"],
test1 = []
},
"25" = {
test = ["114717"],
test1 = []
}
}
item = <<EOF
{
"key": {"S": "${each.key}"},
"test": {"SS": ${jsonencode(each.value.test)}},
"test1": {"SS": ${length(each.value.test1) > 0 ? jsonencode(each.value.test1) : jsonencode([""])}}
}
EOF
}
Also SS can't be empty, so you have to account for that. Thus you have to check for that and use [""] array. Or you have to re-consider what to do if your test1 is [].