LOYALIST-44 Begin migrate Blog nodes, title/body fields

custom/modules/loyalist_migrate/config/install/migrate_plus.migration.1_loyalist_migrate_loyalist_blog.yml

@@ -0,0 +1,32 @@
+id: 1_loyalist_migrate_loyalist_blog
+label: 'Loyalist Blog Posts'
+
+migration_tags:
+  - Loyalist
+  - SQL
+
+source:
+  plugin: loyalist_blog
+  key: migrate
+
+process:
+  nid: nid
+  vid: vid
+  status: status
+  created: created
+  changed: changed
+  promote: promote
+  sticky: sticky
+  title:
+    plugin: callback
+    callable: trim
+    source: title
+  'body/format':
+    plugin: default_value
+    default_value: wysiwyg
+  'body/value': body_value
+  'body/summary': body_summary
+
+destination:
+  plugin: 'entity:node'
+  default_bundle: blog_post

custom/modules/loyalist_migrate/src/Plugin/migrate/source/BlogPost.php

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+<?php
+
+namespace Drupal\loyalist_migrate\Plugin\migrate\source;
+
+use Drupal\migrate\Annotation\MigrateSource;
+use Drupal\migrate\Plugin\migrate\source\SqlBase;
+use Drupal\migrate\Row;
+
+/**
+ * Migrates Loyalist Blog Posts.
+ *
+ * @MigrateSource(
+ *   id = "loyalist_blog",
+ *   source_module = "loyalist_migrate",
+ * )
+ */
+class BlogPost extends SqlBase
+{
+  /**
+   * {@inheritdoc}
+   */
+  public function query()
+  {
+    $query = $this->select('node', 'n');
+    $query->condition('n.type', 'blog');
+    $query->addField('n', 'nid', 'nid');
+    $query->addField('n', 'vid', 'vid');
+    $query->addField('n', 'title', 'title');
+    $query->addField('n', 'status', 'status');
+    $query->addField('n', 'created', 'created');
+    $query->addField('n', 'changed', 'changed');
+    $query->addField('n', 'promote', 'promote');
+    $query->addField('n', 'sticky', 'sticky');
+    $query->leftJoin('field_data_body', 'fb', 'n.nid = fb.entity_id AND fb.deleted = 0');
+    $query->addField('fb', 'body_value', 'body_value');
+    $query->addField('fb', 'body_summary', 'body_summary');
+
+    return $query;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields()
+  {
+    // This maps the field from their name above to a destination field name that is specified in the process section. I generally keep them the same.
+    $fields = [
+      'nid' => 'nid',
+      'vid' => 'vid',
+      'title' => 'title',
+      'status' => 'status',
+      'created' => 'created',
+      'changed' => 'changed',
+      'promote' => 'promote',
+      'sticky' => 'sticky',
+      'body_value' => 'body_value',
+      'body_summary' => 'body_summary',
+     ];
+
+    return $fields;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds()
+  {
+    return [
+      'nid' => [
+        'type' => 'integer',
+        'alias' => 'n',
+      ],
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function prepareRow(Row $row)
+  {
+    /*
+    Example of how to manipulate data using prepareRow.
+    We should generally use process plugins in the yaml definition instead.
+
+    $date = $row->getSourceProperty('date');
+    $time = $row->getSourceProperty('time');
+    $datetime = $date . 'T' . $time . ':00';
+    $row->setSourceProperty('datetime', $datetime);
+    */
+
+    return parent::prepareRow($row);
+  }
+}