Add field ExpressionEvaluationOptions to set expression evaluation scope while using nested template for azurerm_resource_group_template_deployment

[neil-yechenwei]

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Description

Currently, when using a nested template, azurerm_resource_group_template_deployment cannot specify whether template expressions are evaluated within the scope of the parent template or the nested template. So we have to add this new property ExpressionEvaluationOptions to support this scenario.

New or Affected Resource(s)

• azurerm_resource_group_template_deployment

Potential Terraform Configuration

resource "azurerm_resource_group_template_deployment" "example" {
  name                = "acctest-deployment-example"
  resource_group_name = azurerm_resource_group.example.name
  deployment_mode     = "Complete"

  template_content = <<TEMPLATE
{
  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {},
  "variables": {},
  "resources": []
}
TEMPLATE

  expression_evaluation_option {
    scope = "Outer"
  }
}

References

The property link: https://github.com/Azure/azure-sdk-for-go/blob/c760106e3c564f57cd7d264c872bc5ef324c592f/services/resources/mgmt/2020-06-01/resources/models.go#L727

[neil-yechenwei]

The "ExpressionEvaluationOptions" property isn't in use. After confirmed with service team, we have to set ""expressionEvaluationOptions": { "scope": "inner" }," in template content to enable ExpressionEvaluationOptions. So we don't need to implement the "ExpressionEvaluationOptions" property.

Related reference:
https://docs.microsoft.com/en-us/azure/azure-resource-manager/templates/linked-templates?tabs=azure-powershell#expression-evaluation-scope-in-nested-templates

[ghost]

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