Removing the optional gateway parameter does not clear it out from OpenNebula GUI.

[TGM]

Provider version 1.1.1 OpenNebula version 6.4.0

If the gateway https://registry.terraform.io/providers/OpenNebula/opennebula/latest/docs/resources/virtual_network#gateway

was previously defined on resource creation and than removed the entry is not removed from the OpenNebula GUI.

However if the resource was previously defined and then set to an empty string, the value is updated.

Example previously defined:
resource "opennebula_virtual_network" "virtual_network" {
  cluster_ids     = <list of clusters>
  name            = "vlan100"
  bridge          = "br100"
  type            = "dummy"
  dns             = var.virtual_network_dns
  gateway         = x.x.x.x
  network_address = y.y.y.y
  network_mask    = z.z.z.z
}

Example of removal:
resource "opennebula_virtual_network" "virtual_network" {
  cluster_ids     = <list of clusters>
  name            = "vlan100"
  bridge          = "br100"
  type            = "dummy"
  dns             = var.virtual_network_dns
  network_address = y.y.y.y
  network_mask    = z.z.z.z
}

Example of replaced with string:
resource "opennebula_virtual_network" "virtual_network" {
  cluster_ids     = <list of clusters>
  name            = "vlan100"
  bridge          = "br100"
  type            = "dummy"
  dns             = var.virtual_network_dns
  gateway = " "
  network_address = y.y.y.y
  network_mask    = z.z.z.z
}

  # updated in-place
  ~ resource "opennebula_virtual_network" "virtual_network" {
      ~ gateway           = "10.0.0.1" -> " "
        id                = "1"
        name              = "vlan100"

Expected behavior: remove the entry from OpenNebula on deletion.

[treywelsh]

Seems like I didn't reworked the virtual network update code which had a problem with key deletion. Seems I shamefully missed it ...

For other resources like image and security groups the update code was reworked in PR #268