From 6bb88b0306af8691ae7e4f6545b9e9ebd0520acf Mon Sep 17 00:00:00 2001
From: Jean-Michel Vedrine <vedrine@vedrine.org>
Date: Sat, 27 Apr 2019 16:08:43 +0200
Subject: change ref field name in variable table

---
 db/upgrade.php | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

(limited to 'db/upgrade.php')

diff --git a/db/upgrade.php b/db/upgrade.php
index 48cc159..f1db600 100644
--- a/db/upgrade.php
+++ b/db/upgrade.php
@@ -80,6 +80,48 @@ function xmldb_qtype_algebra_upgrade($oldversion=0) {
         }
         upgrade_plugin_savepoint(true, 2012061702, 'qtype', 'algebra');
     }
+    
+    if ($oldversion < 2019042705) {
+
+        // Define key question (foreign) to be dropped form qtype_algebra_variables.
+        $table = new xmldb_table('qtype_algebra_variables');
+        $key = new xmldb_key('question', XMLDB_KEY_FOREIGN, array('question'), 'question', array('id'));
+
+        // Launch drop key question.
+        $dbman->drop_key($table, $key);
+
+        // Record that qtype_algebra savepoint was reached.
+        upgrade_plugin_savepoint(true, 2019042705, 'qtype', 'algebra');
+    }
+
+    if ($oldversion < 2019042706) {
+
+        // Rename field question on table qtype_algebra_variables to questionid.
+        $table = new xmldb_table('qtype_algebra_variables');
+        $field = new xmldb_field('question', XMLDB_TYPE_INTEGER, '10', null, XMLDB_NOTNULL, null, '0', 'id');
+
+        // Launch rename field question.
+        if ($dbman->field_exists($table, $field)) {
+            $dbman->rename_field($table, $field, 'questionid');
+        }
+
+        // Record that qtype_algebra savepoint was reached.
+        upgrade_plugin_savepoint(true, 2019042706, 'qtype', 'algebra');
+    }
+
+    if ($oldversion < 2019042707) {
+
+        // Define key questionid (foreign-unique) to be added to qtype_algebra_variables.
+        $table = new xmldb_table('qtype_algebra_variables');
+        $key = new xmldb_key('questionid', XMLDB_KEY_FOREIGN_UNIQUE, array('questionid'), 'question', array('id'));
+
+        // Launch add key questionid.
+        $dbman->add_key($table, $key);
+
+        // Record that qtype_algebra savepoint was reached.
+        upgrade_plugin_savepoint(true, 2019042707, 'qtype', 'algebra');
+    }
+
     return true;
 }
 
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