Mock outputs doesn't work with attribute key and/or array

[man-david]

Describe the bug

I deploy different Azure resources (resource group and storage account). Storage account depend on resource groups. When I execute my code, in the Init process, all the resource groups are not already created (and I use a for_each loop inside my Terraform module), and I try to use mock outputs inside the Storage Account HCL.

Steps To Reproduce

The storage account HCL

dependency "resource-group" {
  config_path                             = "../resource-group"
  mock_outputs_allowed_terraform_commands = ["init", "validate", "plan"]
  mock_outputs_merge_strategy_with_state  = "shallow"

  mock_outputs = {
    rg_names["scraping_concurrence_00"]     = "mock-rg"
    rg_locations["scraping_concurrence_00"] = "mock-location"
    rg_names["api_offre_prix_00"]           = "mock-rg"
    rg_locations["api_offre_prix_00"]       = "mock-location"
  }
}

inputs = {
  environment                      = local.environment_name
  scraping_concurrence_00_name     = dependency.resource-group.outputs.rg_names["scraping_concurrence_00"]
  scraping_concurrence_00_location = dependency.resource-group.outputs.rg_locations["scraping_concurrence_00"]
  api_offre_prix_00_name           = dependency.resource-group.outputs.rg_names["api_offre_prix_00"]
  api_offre_prix_00_location       = dependency.resource-group.outputs.rg_locations["api_offre_prix_00"]
}

Log error in the init process

time=2024-06-12T15:07:27Z level=error msg=Error: Ambiguous attribute key
time=2024-06-12T15:07:27Z level=error msg=  on /github/workspace/terraform/live/prd/storage-account/terragrunt.hcl line 21, in dependency "resource-group":
time=2024-06-12T15:07:27Z level=error msg=  21:     rg_names["scraping_concurrence_00"]     = "mock-rg"
time=2024-06-12T15:07:27Z level=error msg=If this expression is intended to be a reference, wrap it in parentheses. If
it's instead intended as a literal name containing periods, wrap it in quotes to
create a string literal.

I have the same error for each mock_output

Expected behavior

It should be possible to define mock value in an array where the attribute key doesn't exist yet. If not, Is there any workaround?

Versions

• Terragrunt version: 0.59.1
• Terraform version: 1.8.5
• Environment details (Ubuntu 20.04, Windows 10, etc.): GitHub Runner - Ubuntu latest

Thanks for your help !

[denis256]

Hello, AFAIK, expressions like rg_names["scraping_concurrence_00"] = ... aren't valid

Valid example:

dependency "resource-group" {
  config_path                             = "../module"
  mock_outputs_allowed_terraform_commands = ["init", "validate", "plan"]
  mock_outputs_merge_strategy_with_state  = "shallow"

  mock_outputs = {
    rg_names = {
      scraping_concurrence_00 = "mock-rg"
      api_offre_prix_00       = "mock-rg"
    }
    rg_locations = {
      scraping_concurrence_00 = "mock-location"
      api_offre_prix_00       = "mock-location"
    }
  }
}

Simplified example in: https://github.com/denis256/terragrunt-tests/blob/master/complex-mock/app/terragrunt.hcl

[man-david]

Thanks for this advice.

Before the modification, I had 4 errors for each mock value because of my wrong expressions.

After changing my code, I now have only 2 errors. In fact, for the "scraping_concurrence_00" values, I already have values in the tfstate, because the resource groups are already created. And I still have errors for "api_offre_prix_00", because the resource group is not here for the moment.

This is the error log

time=2024-06-13T06:43:25Z level=error msg=Error: Invalid index
time=2024-06-13T06:43:25Z level=error msg=  36:   api_offre_prix_00_name           = dependency.resource-group.outputs.rg_names["api_offre_prix_00"]
time=2024-06-13T06:43:25Z level=error msg=The given key does not identify an element in this collection value.

time=2024-06-13T06:43:25Z level=error msg=Error: Invalid index
time=2024-06-13T06:43:25Z level=error msg=  37:   api_offre_prix_00_location       = dependency.resource-group.outputs.rg_locations["api_offre_prix_00"]
time=2024-06-13T06:43:25Z level=error msg=The given key does not identify an element in this collection value.

time=2024-06-13T06:43:25Z level=error msg=Module /github/workspace/terraform/live/prd/storage-account has finished with an error: /github/workspace/terraform/live/prd/storage-account/terragrunt.hcl:36-101: Invalid index; The given key does not identify an element in this collection value., and 1 other diagnostic(s) prefix=[/github/workspace/terraform/live/prd/storage-account] 

Do I need to change the value of "mock_outputs_merge_strategy_with_state" or something else?

Thanks

[EDIT] I change the value of mock_outputs_merge_strategy_with_state, from shallow to deep_map_only, and now it works, no more errors. But doing this, I don't use the pre-existed value from the tfstate, I think.

[denis256]

Hi, it is not clear from the description which HCL code was used, it will be helpful to share the updated code