tag/coursetagslib.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17
  18 /**
  19  * coursetagslib.php
  20  *
  21  * @package    core_tag
  22  * @copyright  2007 j.beedell@open.ac.uk
  23  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25
  26 require_once $CFG->dirroot.'/tag/lib.php';
  27 require_once $CFG->dirroot.'/tag/locallib.php';
  28
  29 /**
  30  * Returns an ordered array of tags associated with visible courses
  31  * (boosted replacement of get_all_tags() allowing association with user and tagtype).
  32  *
  33  * @package  core_tag
  34  * @category tag
  35  * @param    int      $courseid A course id. Passing 0 will return all distinct tags for all visible courses
  36  * @param    int      $userid   (optional) the user id, a default of 0 will return all users tags for the course
  37  * @param    string   $tagtype  (optional) The type of tag, empty string returns all types. Currently (Moodle 2.2) there are two
  38  *                              types of tags which are used within Moodle, they are 'official' and 'default'.
  39  * @param    int      $numtags  (optional) number of tags to display, default of 80 is set in the block, 0 returns all
  40  * @param    string   $unused   (optional) was selected sorting, moved to tag_print_cloud()
  41  * @return   array
  42  */
  43 function coursetag_get_tags($courseid, $userid=0, $tagtype='', $numtags=0, $unused = '') {
  44
  45     global $CFG, $DB;
  46
  47     // get visible course ids
  48     $courselist = array();
  49     if ($courseid === 0) {
  50         if ($courses = $DB->get_records_select('course', 'visible=1 AND category>0', null, '', 'id')) {
  51             foreach ($courses as $key => $value) {
  52                 $courselist[] = $key;
  53             }
  54         }
  55     }
  56
  57     // get tags from the db ordered by highest count first
  58     $params = array();
  59     $sql = "SELECT id as tkey, name, id, tagtype, rawname, f.timemodified, flag, count
  60               FROM {tag} t,
  61                  (SELECT tagid, MAX(timemodified) as timemodified, COUNT(id) as count
  62                     FROM {tag_instance}
  63                    WHERE itemtype = 'course' ";
  64
  65     if ($courseid > 0) {
  66         $sql .= "    AND itemid = :courseid ";
  67         $params['courseid'] = $courseid;
  68     } else {
  69         if (!empty($courselist)) {
  70             list($usql, $uparams) = $DB->get_in_or_equal($courselist, SQL_PARAMS_NAMED);
  71             $sql .= "AND itemid $usql ";
  72             $params = $params + $uparams;
  73         }
  74     }
  75
  76     if ($userid > 0) {
  77         $sql .= "    AND tiuserid = :userid ";
  78         $params['userid'] = $userid;
  79     }
  80
  81     $sql .= "   GROUP BY tagid) f
  82              WHERE t.id = f.tagid ";
  83     if ($tagtype != '') {
  84         $sql .= "AND tagtype = :tagtype ";
  85         $params['tagtype'] = $tagtype;
  86     }
  87     $sql .= "ORDER BY count DESC, name ASC";
  88
  89     // limit the number of tags for output
  90     if ($numtags == 0) {
  91         $tags = $DB->get_records_sql($sql, $params);
  92     } else {
  93         $tags = $DB->get_records_sql($sql, $params, 0, $numtags);
  94     }
  95
  96     // prepare the return
  97     $return = array();
  98     if ($tags) {
  99         // avoid print_tag_cloud()'s ksort upsetting ordering by setting the key here
 100         foreach ($tags as $value) {
 101             $return[] = $value;
 102         }
 103     }
 104
 105     return $return;
 106
 107 }
 108
 109 /**
 110  * Returns an ordered array of tags
 111  * (replaces popular_tags_count() allowing sorting).
 112  *
 113  * @package  core_tag
 114  * @category tag
 115  * @param    string $unused (optional) was selected sorting - moved to tag_print_cloud()
 116  * @param    int    $numtags (optional) number of tags to display, default of 20 is set in the block, 0 returns all
 117  * @return   array
 118  */
 119 function coursetag_get_all_tags($unused='', $numtags=0) {
 120
 121     global $CFG, $DB;
 122
 123     // note that this selects all tags except for courses that are not visible
 124     $sql = "SELECT id, name, tagtype, rawname, f.timemodified, flag, count
 125         FROM {tag} t,
 126         (SELECT tagid, MAX(timemodified) as timemodified, COUNT(id) as count
 127             FROM {tag_instance} WHERE tagid NOT IN
 128                 (SELECT tagid FROM {tag_instance} ti, {course} c
 129                 WHERE c.visible = 0
 130                 AND ti.itemtype = 'course'
 131                 AND ti.itemid = c.id)
 132         GROUP BY tagid) f
 133         WHERE t.id = f.tagid
 134         ORDER BY count DESC, name ASC";
 135     if ($numtags == 0) {
 136         $tags = $DB->get_records_sql($sql);
 137     } else {
 138         $tags = $DB->get_records_sql($sql, null, 0, $numtags);
 139     }
 140
 141     $return = array();
 142     if ($tags) {
 143         foreach ($tags as $value) {
 144             $return[] = $value;
 145         }
 146     }
 147
 148     return $return;
 149 }
 150
 151 /**
 152  * Returns javascript for use in tags block and supporting pages
 153  *
 154  * @package  core_tag
 155  * @category tag
 156  * @return   null
 157  */
 158 function coursetag_get_jscript() {
 159     global $CFG, $DB, $PAGE;
 160
 161     $PAGE->requires->js('/tag/tag.js');
 162     $PAGE->requires->strings_for_js(array('jserror1', 'jserror2'), 'block_tags');
 163
 164     if ($coursetags = $DB->get_records('tag', null, 'name ASC', 'name, id')) {
 165         foreach ($coursetags as $key => $value) {
 166             $PAGE->requires->js_function_call('set_course_tag', array($key));
 167         }
 168     }
 169
 170     $PAGE->requires->js('/blocks/tags/coursetags.js');
 171
 172     return '';
 173 }
 174
 175 /**
 176  * Returns javascript to create the links in the tag block footer.
 177  *
 178  * @package  core_tag
 179  * @category tag
 180  * @param    string   $elementid       the element to attach the footer to
 181  * @param    array    $coursetagslinks links arrays each consisting of 'title', 'onclick' and 'text' elements
 182  * @return   string   always returns a blank string
 183  */
 184 function coursetag_get_jscript_links($elementid, $coursetagslinks) {
 185     global $PAGE;
 186
 187     if (!empty($coursetagslinks)) {
 188         foreach ($coursetagslinks as $a) {
 189             $PAGE->requires->js_function_call('add_tag_footer_link', array($elementid, $a['title'], $a['onclick'], $a['text']), true);
 190         }
 191     }
 192
 193     return '';
 194 }
 195
 196 /**
 197  * Returns all tags created by a user for a course
 198  *
 199  * @package  core_tag
 200  * @category tag
 201  * @param    int      $courseid tags are returned for the course that has this courseid
 202  * @param    int      $userid   return tags which were created by this user
 203  */
 204 function coursetag_get_records($courseid, $userid) {
 205     global $CFG, $DB;
 206
 207     $sql = "SELECT t.id, name, rawname
 208               FROM {tag} t, {tag_instance} ti
 209              WHERE t.id = ti.tagid
 210                  AND ti.tiuserid = :userid
 211                  AND ti.itemid = :courseid
 212           ORDER BY name ASC";
 213
 214     return $DB->get_records_sql($sql, array('userid'=>$userid, 'courseid'=>$courseid));
 215 }
 216
 217 /**
 218  * Stores a tag for a course for a user
 219  *
 220  * @package  core_tag
 221  * @category tag
 222  * @param    array  $tags     simple array of keywords to be stored
 223  * @param    int    $courseid the id of the course we wish to store a tag for
 224  * @param    int    $userid   the id of the user we wish to store a tag for
 225  * @param    string $tagtype  official or default only
 226  * @param    string $myurl    (optional) for logging creation of course tags
 227  */
 228 function coursetag_store_keywords($tags, $courseid, $userid=0, $tagtype='official', $myurl='') {
 229
 230     global $CFG;
 231
 232     if (is_array($tags) and !empty($tags)) {
 233         foreach ($tags as $tag) {
 234             $tag = trim($tag);
 235             if (strlen($tag) > 0) {
 236                 //tag_set_add('course', $courseid, $tag, $userid); //deletes official tags
 237
 238                 //add tag if does not exist
 239                 if (!$tagid = tag_get_id($tag)) {
 240                     $tag_id_array = tag_add(array($tag), $tagtype);
 241                     $tagid = $tag_id_array[core_text::strtolower($tag)];
 242                 }
 243                 //ordering
 244                 $ordering = 0;
 245                 if ($current_ids = tag_get_tags_ids('course', $courseid)) {
 246                     end($current_ids);
 247                     $ordering = key($current_ids) + 1;
 248                 }
 249                 //set type
 250                 tag_type_set($tagid, $tagtype);
 251
 252                 //tag_instance entry
 253                 tag_assign('course', $courseid, $tagid, $ordering, $userid, 'core', context_course::instance($courseid)->id);
 254             }
 255         }
 256     }
 257
 258 }
 259
 260 /**
 261  * Deletes a personal tag for a user for a course.
 262  *
 263  * @package  core_tag
 264  * @category tag
 265  * @param    int      $tagid    the tag we wish to delete
 266  * @param    int      $userid   the user that the tag is associated with
 267  * @param    int      $courseid the course that the tag is associated with
 268  */
 269 function coursetag_delete_keyword($tagid, $userid, $courseid) {
 270     tag_delete_instance('course', $courseid, $tagid, $userid);
 271 }
 272
 273 /**
 274  * Get courses tagged with a tag
 275  *
 276  * @global moodle_database $DB
 277  * @package  core_tag
 278  * @category tag
 279  * @param int $tagid
 280  * @return array of course objects
 281  */
 282 function coursetag_get_tagged_courses($tagid) {
 283     global $DB;
 284
 285     $courses = array();
 286
 287     $ctxselect = context_helper::get_preload_record_columns_sql('ctx');
 288
 289     $sql = "SELECT c.*, $ctxselect
 290             FROM {course} c
 291             JOIN {tag_instance} t ON t.itemid = c.id
 292             JOIN {context} ctx ON ctx.instanceid = c.id
 293             WHERE t.tagid = :tagid AND
 294             t.itemtype = 'course' AND
 295             ctx.contextlevel = :contextlevel
 296             ORDER BY c.sortorder ASC";
 297     $params = array('tagid' => $tagid, 'contextlevel' => CONTEXT_COURSE);
 298     $rs = $DB->get_recordset_sql($sql, $params);
 299     foreach ($rs as $course) {
 300         context_helper::preload_from_record($course);
 301         if ($course->visible == 1 || has_capability('moodle/course:viewhiddencourses', context_course::instance($course->id))) {
 302             $courses[$course->id] = $course;
 303         }
 304     }
 305     return $courses;
 306 }
 307
 308 /**
 309  * Course tagging function used only during the deletion of a course (called by lib/moodlelib.php) to clean up associated tags
 310  *
 311  * @package core_tag
 312  * @param   int      $courseid     the course we wish to delete tag instances from
 313  * @param   bool     $showfeedback if we should output a notification of the delete to the end user
 314  */
 315 function coursetag_delete_course_tags($courseid, $showfeedback=false) {
 316     global $DB, $OUTPUT;
 317
 318     if ($taginstances = $DB->get_fieldset_select('tag_instance', 'tagid', "itemtype = 'course' AND itemid = :courseid",
 319         array('courseid' => $courseid))) {
 320
 321         tag_delete(array_values($taginstances));
 322     }
 323
 324     if ($showfeedback) {
 325         echo $OUTPUT->notification(get_string('deletedcoursetags', 'tag'), 'notifysuccess');
 326     }
 327 }
 328