Need help with terraform and conditionals

Terraform
1

Hi all,

First of all i’ve been using terraform for a couple of years, mostly simpler usecases, i’ve run into a requirement that have me stumped. I’m using terraform to configure Cisco ACI.

Given the code below:

resource "aci_endpoint_security_group" "terraform_esg" {
  for_each                             = var.esgs 

  application_profile_dn               = var.apps[each.value.network].id
  name                                 = join("-", [trimprefix(var.tenants[each.value.tenant].name,"tnt-"), lower(each.value.application)])
  description                          = join(" ", ["Endpoint Security Group for", each.value.application, "in Tenant", var.tenants[each.value.tenant].name])
  pc_enf_pref                          = "unenforced"
  pref_gr_memb                         = each.value.prefgr_member == "yes" ? "include" : "exclude"
  relation_fv_rs_scope                 = var.vrfs[each.value.vrf].id
  name_alias                           = each.key

  relation_fv_rs_prov                  {
    target_dn                            = var.contracts[each.value.p_contract].id
  }

  relation_fv_rs_cons                  {
    target_dn                            = var.contracts[each.value.c_contract].id
  }
}

and:

esgs                     = {
  ESG1000                      = {
    tenant                       = "TEN2"
    vrf                          = "VRF2"
    network                      = "NETW2"
    application                  = "Default"
    epg                          = "NETW2"
    prefgr_member                = "yes"
    p_contract                     = ""
    c_contract                     = ""
    infra_service                = ""
  }
  ESG1001                      = {
    tenant                       = "TEN2"
    vrf                          = "VRF2"
    network                      = "NETW2"
    application                  = "Astro_VMS-Common_Infra_AM"
    epg                          = ""
    prefgr_member                = "yes"
    p_contract                     = "CTR1000"
    c_contract                     = "CTR1001"
    infra_service                = ""
  }
}

how can i only provision the relation_fv_rs_prov if the p_contract is not empty and the same for relation_fv_rs_cons if c_contract is not empty