Terraform S3 to Lambda notification

resources.tf

provider "aws" {
  access_key = "${var.access_key}"
  secret_key = "${var.secret_key}"
  region = "${var.region}"
}

resource "aws_iam_role" "iam_for_terraform_lambda" {
    name = "app_${var.app_env}_lambda"
    assume_role_policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "Service": "lambda.amazonaws.com"
      },
      "Effect": "Allow"
    }
  ]
}
EOF
}

resource "aws_iam_role_policy_attachment" "terraform_lambda_iam_policy_basic_execution" {
  role = "${aws_iam_role.iam_for_terraform_lambda.id}"
  policy_arn = "arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
}

resource "aws_lambda_permission" "allow_terraform_bucket" {
    statement_id = "AllowExecutionFromS3Bucket"
    action = "lambda:InvokeFunction"
    function_name = "${aws_lambda_function.terraform_func.arn}"
    principal = "s3.amazonaws.com"
    source_arn = "${aws_s3_bucket.terraform_bucket.arn}"
}

resource "aws_lambda_function" "terraform_func" {
    filename = "helloworld_2.zip"
    function_name = "playbook_lambda_name_${var.app_env}"
    role = "${aws_iam_role.iam_for_terraform_lambda.arn}"
    handler = "helloworld.handler"
    runtime = "nodejs4.3"
}

resource "aws_s3_bucket" "terraform_bucket" {
    bucket = "app-terraform-${var.app_env}"
}

resource "aws_s3_bucket_notification" "bucket_terraform_notification" {
    bucket = "${aws_s3_bucket.terraform_bucket.id}"
    lambda_function {
        lambda_function_arn = "${aws_lambda_function.terraform_func.arn}"
        events = ["s3:ObjectCreated:*"]
        filter_prefix = "content-packages/"
        /* filter_suffix = ".json" */
    }
}

run_deploy.sh

#!/bin/bash

# configure remote s3 state
terraform remote config \
  -backend=s3 \
  -backend-config="bucket=app-terraform-deployments" \
  -backend-config="key=deployment_states/app.staging.tfstate" \
  -backend-config="region=us-west-2"
  
# up new infra
terraform plan -var-file=./staging.tfvars
terraform apply -var-file=./staging.tfvars

staging.tfvars

app_env = "staging"

variables.tf

variable "app_env" { }

variable "access_key" {
  default = "access_key"
}
variable "secret_key" {
  default = "secret_key"
}
variable "region" {
  default = "us-west-2"
}

Shouldn't line 33 of resources.tf be the following?

    function_name = "${aws_lambda_function.terraform_func.function_name}"