migration from version <0.2.25 to new one fixed

Author: 0ndi

docs/data-sources/gcore_k8s.md

@@ -50,6 +50,7 @@ data "gcore_k8s" "v" {
 - **container_version** (String)
 - **created_at** (String)
 - **discovery_url** (String)
+- **external_dns_enabled** (Boolean)
 - **faults** (Map of String)
 - **fixed_network** (String)
 - **fixed_subnet** (String)

docs/resources/gcore_k8s.md

@@ -51,6 +51,7 @@ resource "gcore_k8s" "v" {
 ### Optional
 
 - **auto_healing_enabled** (Boolean)
+- **external_dns_enabled** (Boolean)
 - **id** (String) The ID of this resource.
 - **last_updated** (String)
 - **master_lb_floating_ip_enabled** (Boolean)

docs/resources/gcore_loadbalancer.md

@@ -25,6 +25,10 @@ resource "gcore_loadbalancer" "lb" {
   region_id = 1
   name = "test"
   flavor = "lb1-1-2"
+  //when upgrading to version 0.2.28 nested listener max length reduced to 1
+  //that mean, if you had more than one nested listener and removed them from
+  //schema they not delete in the cloud. User has to delete it manually and
+  //recreate as gcore_lblistener resource
   listener {
     name = "test"
     protocol = "HTTP"

examples/resources/gcore_loadbalancer/resource.tf

@@ -10,6 +10,10 @@ resource "gcore_loadbalancer" "lb" {
   region_id = 1
   name = "test"
   flavor = "lb1-1-2"
+  //when upgrading to version 0.2.28 nested listener max length reduced to 1
+  //that mean, if you had more than one nested listener and removed them from
+  //schema they not delete in the cloud. User has to delete it manually and
+  //recreate as gcore_lblistener resource
   listener {
     name = "test"
     protocol = "HTTP"

gcore/resource_gcore_loadbalancer.go

@@ -286,13 +286,22 @@ func resourceLoadBalancerRead(ctx context.Context, d *schema.ResourceData, m int
 	fields := []string{"flavor", "vip_network_id", "vip_subnet_id"}
 	revertState(d, &fields)
 
-	cl := d.Get("listener").([]interface{})[0]
 	listenersClient, err := CreateClient(provider, d, LBListenersPoint, versionPointV1)
 	if err != nil {
 		return diag.FromErr(err)
 	}
 
-	currentL := cl.(map[string]interface{})
+	var ok bool
+	currentL := make(map[string]interface{})
+	// we need to find correct listener because after upgrade some of them could be nil
+	// but still in terraform.state
+	cls := d.Get("listener").([]interface{})
+	for _, cl := range cls {
+		if currentL, ok = cl.(map[string]interface{}); ok {
+			break
+		}
+	}
+
 	for _, l := range lb.Listeners {
 		listener, err := listeners.Get(listenersClient, l.ID).Extract()
 		if err != nil {