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Developer Documentation
- Bug fixes for general core bugs in 3.10.x will end 8 November 2021 (12 months).
- Bug fixes for security issues in 3.10.x will end 9 May 2022 (18 months).
- PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
/tag/classes/ -> index_builder.php (source)
Class core_tag_index_builder
| Copyright: | 2016 Marina Glancy |
| License: | http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| File Size: | 373 lines (14 kb) |
| Included or required: | 0 times |
| Referenced: | 0 times |
| Includes or requires: | 0 files |
Defines 1 class
core_tag_index_builder:: (14 methods):
__construct()
prepare_sql_courses()
prepare_sql_items()
retrieve_items()
get_items()
has_item_that_needs_access_check()
walk()
set_accessible()
get_course()
init_course_access()
init_items_access()
can_access_course()
save_caches()
reset_caches()
Class: core_tag_index_builder - X-Ref
Helper to build tag indexThis can be used by components to implement tag area callbacks. This is especially
useful for in-course content when we need to check and cache user's access to
multiple courses. Course access and accessible items are stored in session cache
with 15 minutes expiry time.
Example of usage:
$builder = new core_tag_index_builder($component, $itemtype, $sql, $params, $from, $limit);
while ($item = $builder->has_item_that_needs_access_check()) {
if (!$builder->can_access_course($item->courseid)) {
$builder->set_accessible($item, false);
} else {
$accessible = true; // Check access and set $accessible respectively.
$builder->set_accessible($item, $accessible);
}
}
$items = $builder->get_items();
| __construct($component, $itemtype, $sql, $params, $from, $limit) X-Ref |
| Constructor. Specify the SQL query for retrieving the tagged items, SQL query must: - return the item id as the first field and make sure that it is unique in the result - provide ORDER BY that exclude any possibility of random results, if $fromctx was specified when searching for tagged items it is the best practice to make sure that items from this context are returned first. This query may also contain placeholders %COURSEFILTER% or %ITEMFILTER% that will be substituted with expressions excluding courses and/or filters that are already known as inaccessible. Example: "WHERE c.id %COURSEFILTER% AND cm.id %ITEMFILTER%" This query may contain fields to preload context if context is needed for formatting values. It is recommended to sort by course sortorder first, this way the items from the same course will be next to each other and the sequence of courses will the same in different tag areas. param: string $component component responsible for tagging param: string $itemtype type of item that is being tagged param: string $sql SQL query that would retrieve all relevant items without permission check param: array $params parameters for the query (must be named) param: int $from return a subset of records, starting at this point param: int $limit return a subset comprising this many records in total (this field is NOT optional) |
| prepare_sql_courses() X-Ref |
| Substitute %COURSEFILTER% with an expression filtering out courses where current user does not have access |
| prepare_sql_items() X-Ref |
| Substitute %ITEMFILTER% with an expression filtering out items where current user does not have access |
| retrieve_items() X-Ref |
| Ensures that SQL query was executed and $this->items is filled |
| get_items() X-Ref |
| Returns the filtered records from SQL query result. This function can only be executed after $builder->has_item_that_needs_access_check() returns null return: array |
| has_item_that_needs_access_check() X-Ref |
| Returns the first row from the SQL result that we don't know whether it is accessible by user or not. This will return null when we have necessary number of accessible items to return in {@link get_items()} After analyzing you may decide to mark not only this record but all similar as accessible or not accessible. For example, if you already call get_fast_modinfo() to check this item's accessibility, why not mark all items in the same course as accessible or not accessible. Helpful methods: {@link set_accessible()} and {@link walk()} return: null|object |
| walk($callable) X-Ref |
| Walk through the array of items and call $callable for each of them param: callable $callable |
| set_accessible($identifier, $accessible = true) X-Ref |
| Marks record or group of records as accessible (or not accessible) param: int|std_Class $identifier either record id of the item that needs to be set accessible param: bool $accessible whether to mark as accessible or not accessible (default true) |
| get_course($courseid) X-Ref |
| Retrieves a course record (only fields id,visible,fullname,shortname,cacherev). This method is useful because it also caches results and preloads course context. param: int $courseid |
| init_course_access() X-Ref |
| Ensures that we read the course access from the cache. |
| init_items_access() X-Ref |
| Ensures that we read the items access from the cache. |
| can_access_course($courseid) X-Ref |
| Checks if current user has access to the course This method calls global function {@link can_access_course} and caches results param: int $courseid return: bool |
| save_caches() X-Ref |
| Saves course/items caches if needed |
| reset_caches() X-Ref |
| Resets all course/items session caches - useful in unittests when we change users and enrolments. |
