write migrations for documents

console/migrations/m211223_092038_create_document_field_table.php

@@ -0,0 +1,28 @@
+<?php
+
+use yii\db\Migration;
+
+/**
+ * Handles the creation of table `{{%field}}`.
+ */
+class m211223_092038_create_document_field_table extends Migration
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function safeUp()
+    {
+        $this->createTable('{{%document_field}}', [
+            'id' => $this->primaryKey(),
+            'title' => $this->string(),
+        ]);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function safeDown()
+    {
+        $this->dropTable('{{%document_field}}');
+    }
+}