IcingaTimePeriod: fix config errors at deploy time

application/forms/IcingaTimePeriodForm.php

@@ -38,10 +38,20 @@ class IcingaTimePeriodForm extends DirectorObjectForm
             'description' => $this->translate('the display name')
         ));
 
-        $this->addElement('text', 'update_method', array(
-            'label' => $this->translate('Update Method'),
-            'description' => $this->translate('the update method'),
-        ));
+        if ($this->isTemplate()) {
+            $this->addElement('text', 'update_method', array(
+                'label'       => $this->translate('Update Method'),
+                'description' => $this->translate('the update method'),
+                'value'       => 'LegacyTimePeriod',
+            ));
+
+        } else {
+            // TODO: I'd like to skip this for objects inheriting from a template
+            //       with a defined update_method. However, unfortunately it's too
+            //       early for $this->object()->getResolvedProperty('update_method').
+            //       Should be fixed.
+            $this->addHidden('update_method', 'LegacyTimePeriod');
+        }
 
         $this->addImportsElement();
 

library/Director/Objects/IcingaTimePeriod.php

@@ -2,6 +2,8 @@
 
 namespace Icinga\Module\Director\Objects;
 
+use Icinga\Module\Director\IcingaConfig\IcingaConfigHelper as c;
+
 class IcingaTimePeriod extends IcingaObject
 {
     protected $table = 'icinga_timeperiod';
@@ -19,4 +21,18 @@ class IcingaTimePeriod extends IcingaObject
     protected $supportsImports = true;
 
     protected $supportsRanges = true;
+
+    /**
+     * Render update property
+     *
+     * Avoid complaints for method names with underscore:
+     * @codingStandardsIgnoreStart
+     *
+     * @return string
+     */
+    public function renderUpdate_method()
+    {
+        // @codingStandardsIgnoreEnd
+        return c::renderKeyValue('update', $this->update_method);
+    }
 }