`allow_existing_on_create` conflicts with auto-created objects (DCNE-565)

[danischm]

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Description

In some instances APIC "auto-creates" some of the objects in the backend, eg. when creating a new interface policy group (infraAccGrp) it automatically creates child objects like infraRsCdpIfPol. When allow_existing_on_create is set to false you can no longer set/update those placeholder objects.

One possible solution could be to introduce an allow_existing_on_create resource level flag in addition to the global flag, allowing one to selectively relax the requirement for those instances.

New or Affected Resource(s) + ACI Class(es):

• aci_rest_managed

APIC version and APIC Platform

all versions

Potential Terraform Configuration

provider "aci" {
  allow_existing_on_create = false
}

resource "aci_rest_managed" "infraAccGrp" {
  dn         = "uni/infra/funcprof/accportgrp-IPG1"
  content = {
    name      = "IPG1"
  }
}

resource "aci_rest_managed" "infraRsCdpIfPol" {
  dn         = "${aci_rest_managed.infraAccGrp.dn}/rscdpIfPol"
  class_name = "infraRsCdpIfPol"
  content = {
    tnCdpIfPolName = "CDP1"
  }
}