Add the summary in the authors.

The summary is just the bio of the author.

web/modules/custom/geo_upgrade/migrations/upgrade_d7_node_story_author.yml

@@ -28,6 +28,7 @@ process:
     - plugin: migration_lookup
       migration: upgrade_d7_taxonomy_term_custom_terms
       source: constants/author_type_source_id
+  field_summary: bio
 destination:
   plugin: 'entity:node'
   default_bundle: people

web/modules/custom/geo_upgrade/src/Plugin/migrate/source/Author.php

@@ -24,6 +24,30 @@ class Author extends SqlBase {
     // Make sure to all the author names are trimmed.
     $row->setSourceProperty('field_author_value', trim($field_author));
 
+    // The bio value is going to be get from the last contribution of the user
+    // where the bio field is not empty.
+    $query = $this->database->query(
+      'SELECT entity_id, revision_id FROM field_data_field_author WHERE field_author_value = :field_author ORDER BY entity_id DESC',
+      ['field_author' => $field_author]
+    );
+    foreach ($query as $record) {
+      $bio_query = $this->database->query(
+        "SELECT field_author_bio_value FROM field_data_field_author_bio WHERE entity_id = :entity_id AND revision_id = :revision_id",
+        ['entity_id' => $record->entity_id, 'revision_id' => $record->revision_id]
+      );
+      $bio_result = $bio_query->fetchAssoc();
+
+      // Once we find a bio no need to continue.
+      if (!empty($bio_result)) {
+        break;
+      }
+    }
+
+    $row->setSourceProperty('bio', ["value" => '']);
+    if (!empty($bio_result)) {
+      $row->setSourceProperty('bio', ["value" => $bio_result['field_author_bio_value']]);
+    }
+
     return parent::prepareRow($row);
   }