helper/schema: can diff complex resource

helper/schema/schema.go

@@ -169,6 +169,15 @@ func (m schemaMap) diffList(
 		}
 	case *Resource:
 		// This is a complex resource
+		for i, _ := range vs {
+			for k2, schema := range t.Schema {
+				subK := fmt.Sprintf("%s.%d.%s", k, i, k2)
+				err := m.diff(subK, schema, diff, s, c)
+				if err != nil {
+					return err
+				}
+			}
+		}
 	default:
 		return fmt.Errorf("%s: unknown element type (internal)", k)
 	}

helper/schema/schema_test.go

@@ -309,6 +309,52 @@ func TestSchemaMap_Diff(t *testing.T) {
 
 			Err: false,
 		},
+
+		/*
+		 * List of structure decode
+		 */
+
+		{
+			Schema: map[string]*Schema{
+				"ingress": &Schema{
+					Type:     TypeList,
+					Required: true,
+					Elem: &Resource{
+						Schema: map[string]*Schema{
+							"from": &Schema{
+								Type:     TypeInt,
+								Required: true,
+							},
+						},
+					},
+				},
+			},
+
+			State: nil,
+
+			Config: map[string]interface{}{
+				"ingress": []interface{}{
+					map[string]interface{}{
+						"from": 8080,
+					},
+				},
+			},
+
+			Diff: &terraform.ResourceDiff{
+				Attributes: map[string]*terraform.ResourceAttrDiff{
+					"ingress.#": &terraform.ResourceAttrDiff{
+						Old: "",
+						New: "1",
+					},
+					"ingress.0.from": &terraform.ResourceAttrDiff{
+						Old: "",
+						New: "8080",
+					},
+				},
+			},
+
+			Err: false,
+		},
 	}
 
 	for i, tc := range cases {