add migration that changes the type of resource_property_definitions.type to ENUM, fixes #1796

Closes #1796

Merge request studip/studip!1210

db/migrations/5.1.36_change_type_of_resource_property_definitions_type.php

+<?php
+final class ChangeTypeOfResourcePropertyDefinitionsType extends Migration
+{
+    public function description()
+    {
+        return 'Changes the type of resource_property_definitions.type to ENUM';
+    }
+
+    protected function up()
+    {
+        $query = "ALTER TABLE `resource_property_definitions`
+                  CHANGE COLUMN  `type` `type` ENUM('bool', 'text', 'num', 'select', 'user', 'institute', 'position', 'fileref', 'url') COLLATE latin1_bin NOT NULL";
+        DBManager::get()->exec($query);
+    }
+
+    protected function down()
+    {
+        $query = "ALTER TABLE `resource_property_definitions`
+                  CHANGE COLUMN  `type` `type` SET('bool', 'text', 'num', 'select', 'user', 'institute', 'position', 'fileref', 'url', 'resource_ref_list') COLLATE latin1_bin DEFAULT NULL";
+        DBManager::get()->exec($query);
+    }
+}