new things and command

web/modules/custom/ufc/src/Commands/UfcCommands.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Drupal\ufc\Commands;
+
+use Drupal\node\Entity\Node;
+use Drush\Commands\DrushCommands;
+
+class UfcCommands extends DrushCommands {
+
+  /**
+   * Update fights with their event date.
+   *
+   * @command ufc:update-fight-dates
+   * @aliases ufc-ufd
+   */
+  public function updateFightDates() {
+    // Get all fights
+    // For each fight
+    //  Go get event date.
+    //  Add to new field
+    //  Save.
+    $fights = \Drupal::entityTypeManager()->getStorage('node')->loadByProperties(['type' => 'fight']);
+    foreach ($fights as $fight) {
+      $fight->field_fight_date = $this->getEventDateTimestampFromFight($fight);
+      if ($fight->save()) {
+        $this->output->writeln($fight->title->value . " updated successfully.");
+      }
+      else {
+        $this->output->writeln($fight->title->value . " failed.");
+      }
+    }
+  }
+
+
+  private function getEventDateTimestampFromFight(Node $fight_node) {
+    // Get field value.
+    $event_date_value = $fight_node->field_event->entity->field_event_date->value;
+    assert($event_date_value, !null);
+
+    return strtotime($event_date_value);
+  }
+
+}