Terraform: How to Handle Resource Dependencies with Dynamic Blocks for RDS Instances
I'm working on a project and hit a roadblock. I'm working on a personal project and This might be a silly question, but I'm trying to create an Amazon RDS instance using Terraform, but I'm running into issues with resource dependencies when using dynamic blocks to configure multiple DB parameter groups... I have a situation where I want to create multiple parameter groups for different database engines, but Terraform seems to be mismanaging the dependencies between these resources. Here's the code I've written so far: ```hcl resource "aws_db_parameter_group" "example" { count = length(var.db_parameter_groups) name = "${var.db_parameter_groups[count.index].name}" family = var.db_parameter_groups[count.index].family dynamic "parameter" { for_each = var.db_parameter_groups[count.index].parameters content { name = parameter.value.name value = parameter.value.value } } } resource "aws_db_instance" "example" { identifier = "my-db-instance" instance_class = "db.t3.micro" allocated_storage = 20 engine = "postgres" parameter_group_name = aws_db_parameter_group.example[count.index].name } ``` Variable `db_parameter_groups` is a list of maps, where each map contains the name, family, and parameters for the DB parameter groups. However, when I run `terraform plan`, I get the following error: ``` Error: Invalid index on main.tf line 12, in resource "aws_db_instance" "example": 12: parameter_group_name = aws_db_parameter_group.example[count.index].name The "count.index" is out of range for "aws_db_parameter_group.example" ``` I’ve checked that `db_parameter_groups` contains the expected values, and I thought `count.index` would correctly reference each dynamic block. However, it's clear that Terraform is having trouble linking the db instance to the generated parameter groups. I’ve tried restructuring the code and defining the parameter groups outside the dynamic block but still face similar issues. Is there a recommended way to manage resource dependencies in this scenario or an alternative approach to achieve what I'm trying to do? Any insights would be appreciated! This is part of a larger API I'm building. I'm working on a API that needs to handle this. Has anyone else encountered this? What's the best practice here?