// (course independent)
//Insert necessary category ids to backup_ids table
- function insert_category_ids ($course,$backup_unique_code,$instances=null) {
+ function insert_category_ids($course, $backup_unique_code, $instances = null) {
global $CFG;
include_once("$CFG->dirroot/mod/quiz/lib.php");
- //Create missing categories and reasign orphaned questions
+ //Create missing categories and reasign orphaned questions.
fix_orphaned_questions($course);
- // defaults
- $where = "q.course = '$course' AND g.quiz = q.id AND ";
- $from = ", {$CFG->prefix}quiz q";
- // but if we have an array of quiz ids, use those instead.
+ // First, all categories from this course.
+ $status = execute_sql("INSERT INTO {$CFG->prefix}backup_ids
+ (backup_code, table_name, old_id, info)
+ SELECT '$backup_unique_code', 'question_categories', qc.id, ''
+ FROM {$CFG->prefix}question_categories qc
+ WHERE qc.course = $course", false);
+
+ // Then published categories from other courses used by the quizzes we are backing up.
+ $from = "{$CFG->prefix}quiz quiz,";
+ $where = "AND quiz.course = '$course'
+ AND qqi.quiz = quiz.id";
if (!empty($instances) && is_array($instances) && count($instances)) {
- $where = ' g.quiz IN ('.implode(',',array_keys($instances)).') AND ';
$from = '';
+ $where = 'AND qqi.quiz IN ('.implode(',',array_keys($instances)).')';
}
-
- //Detect used categories (by category in questions)
- $status = execute_sql("INSERT INTO {$CFG->prefix}backup_ids
- (backup_code, table_name, old_id, info)
- SELECT DISTINCT $backup_unique_code,'question_categories',t.category,''
- FROM {$CFG->prefix}question t,
- {$CFG->prefix}quiz_question_instances g
- $from
- WHERE $where g.question = t.id",false);
-
- //Now, foreach detected category, we look for their parents upto 0 (top category)
- $categories = get_records_sql("SELECT old_id, old_id
- FROM {$CFG->prefix}backup_ids
- WHERE backup_code = $backup_unique_code AND
- table_name = 'question_categories'");
-
- if ($categories) {
- foreach ($categories as $category) {
- if ($dbcat = get_record('question_categories','id',$category->old_id)) {
- //echo $dbcat->name; //Debug
- //Go up to 0
- while ($dbcat->parent != 0) {
- //echo '->'; //Debug
- $current = $dbcat->id;
- if ($dbcat = get_record('question_categories','id',$dbcat->parent)) {
- //Found parent, add it to backup_ids (by using backup_putid
- //we ensure no duplicates!)
- $status = backup_putid($backup_unique_code,'question_categories',$dbcat->id,0);
- //echo $dbcat->name; //Debug
- } else {
- //Parent not found, fix it (set its parent to 0)
- set_field ('question_categories','parent',0,'id',$current);
- //echo 'assigned to top!'; //Debug
- }
- }
- //echo '<br />'; //Debug
+ $categories = get_records_sql("
+ SELECT id, parent, 0 AS childrendone
+ FROM {$CFG->prefix}question_categories
+ WHERE course <> $course
+ AND id IN (
+ SELECT DISTINCT question.category
+ FROM {$CFG->prefix}question question,
+ $from
+ {$CFG->prefix}quiz_question_instances qqi
+ WHERE qqi.question = question.id
+ $where
+ )", false);
+ if (!$categories) {
+ $categories = array();
+ }
+
+ // Add the parent categories, of these categories up to the top of the category tree.
+ foreach ($categories as $category) {
+ while ($category->parent != 0) {
+ if (array_key_exists($category->parent, $categories)) {
+ // Parent category already on the list.
+ break;
+ }
+ $currentid = $category->id;
+ $category = get_record('question_categories', 'id', $category->parent, '', '', '', '', 'id, parent, 0 AS childrendone');
+ if ($category) {
+ $categories[$category->id] = $category;
+ } else {
+ // Parent not found: this indicates an error, but just fix it.
+ set_field('question_categories', 'parent', 0, 'id', $currentid);
+ break;
}
}
}
- // Now we look for random questions that can use questions from subcategories
- // because we will have to add these subcategories
- $sql = "SELECT t.id, t.category
- FROM {$CFG->prefix}quiz_question_instances g,
- {$CFG->prefix}question t
- $from
- WHERE $where t.id = g.question
- AND t.qtype = '".RANDOM."'
- AND t.questiontext = '1'";
- if ($randoms = get_records_sql($sql)) {
- foreach ($randoms as $random) {
- $status = quiz_backup_add_category_tree($backup_unique_code, $random->category);
+ // Now we look for categories from other courses containing random questions
+ // in our quiz that select from the category and its subcategories. That implies
+ // those subcategories also need to be backed up. (The categories themselves
+ // and their parents will already have been included.)
+ $categorieswithrandom = get_records_sql("
+ SELECT DISTINCT question.category AS id
+ FROM {$CFG->prefix}quiz_question_instances qqi,
+ $from
+ {$CFG->prefix}question question
+ WHERE question.id = qqi.question
+ AND question.qtype = '" . RANDOM . "'
+ AND question.questiontext = '1'
+ $where
+ ");
+ if ($categorieswithrandom) {
+ foreach ($categorieswithrandom as $category) {
+ $status = quiz_backup_add_sub_categories($categories, $category->id);
}
}
+ // Finally, add all these extra categories to the backup_ids table.
+ foreach ($categories as $category) {
+ $status = $status && backup_putid($backup_unique_code, 'question_categories', $category->id, 0);
+ }
+
return $status;
}
/**
- * Helper function adding the id of a category and all its descendents to the backup_ids
- */
- function quiz_backup_add_category_tree($backup_unique_code, $categoryid) {
- $status = backup_putid($backup_unique_code,'question_categories',$categoryid,0);
- if ($subcategories = get_records('question_categories', 'parent', $categoryid, 'sortorder ASC', 'id, id')) {
+ * Helper function adding the id of all the subcategories of a category to an array.
+ */
+ function quiz_backup_add_sub_categories(&$categories, $categoryid) {
+ $status = true;
+ if ($categories[$categoryid]->childrendone) {
+ return $status;
+ }
+ if ($subcategories = get_records('question_categories', 'parent', $categoryid, '', 'id, 0 AS childrendone')) {
foreach ($subcategories as $subcategory) {
- $status = quiz_backup_add_category_tree($backup_unique_code, $subcategory->id);
+ if (!array_key_exists($subcategory->id, $categories)) {
+ $categories[$subcategory->id] = $subcategory;
+ }
+ $status = $status && quiz_backup_add_sub_categories($categories, $subcategory->id);
}
}
+ $categories[$categoryid]->childrendone = 1;
return $status;
}
projects / moodle.git / commitdiff