From d16cf374eb236034ee65839eb125a79a31d54f7d Mon Sep 17 00:00:00 2001
From: David Monllao <davidm@moodle.com>
Date: Tue, 6 Jun 2017 17:04:20 +0200
Subject: [PATCH] MDL-59162 tool_models: Remove dependant models on uninstall

Part of MDL-57791 epic.
---
 admin/tool/models/db/uninstall.php | 44 ++++++++++++++++++++++++++++++
 analytics/classes/model.php        | 11 ++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 admin/tool/models/db/uninstall.php

diff --git a/admin/tool/models/db/uninstall.php b/admin/tool/models/db/uninstall.php
new file mode 100644
index 00000000000..6034777c889
--- /dev/null
+++ b/admin/tool/models/db/uninstall.php
@@ -0,0 +1,44 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * tool_models plugin uninstallation.
+ *
+ * @package    tool_models
+ * @copyright  2017 David Monllao {@link http://www.davidmonllao.com}
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+function xmldb_tool_models_uninstall() {
+    global $DB;
+
+    // Remove the models that are using this tool targets.
+    $targets = core_component::get_component_classes_in_namespace('tool_models', 'analytics\target');
+
+    $options = array();
+    foreach ($targets as $classname => $unused) {
+        $target = \core_analytics\manager::get_target($classname);
+        $options[] = '\\' . get_class($target);
+    }
+    list($sql, $params) = $DB->get_in_or_equal($options);
+    $models = $DB->get_records_select('analytics_models', "target $sql", $params);
+    foreach ($models as $modelobj) {
+        $model = new \core_analytics\model($modelobj);
+        $model->delete();
+    }
+}
diff --git a/analytics/classes/model.php b/analytics/classes/model.php
index bf571a3180b..7fe00e9be2c 100644
--- a/analytics/classes/model.php
+++ b/analytics/classes/model.php
@@ -316,6 +316,17 @@ class model {
         $this->uniqueid = null;
     }
 
+    /**
+     * Removes the model.
+     *
+     * @return void
+     */
+    public static function delete() {
+        global $DB;
+        $this->clear_model();
+        $DB->delete_record('analytics_models', array('id' => $this->model->id));
+    }
+
     /**
      * Evaluates the model datasets.
      *