コメントAPI

Moodle 2.0

作成中です - Mitsuhiro Yoshida (トーク)

目的

コメントAPIのゴールは以下のとおりです:

• コメントを一元管理する
• Moodle全体を通して、すべてのコメントに一貫したアプローチを使用する
• コメントAPIを既存モジュールに簡単に統合できる
• JavaScriptが有効か否かに関係なく動作する

概要

コメントAPIでは以下の機能を提供します:

1. コメントを追加すｒ
2. コメントを管理する
3. コメントを削除する

また、ページを再読み込みすることなくコメントを追加/削除するための派手なAjaxインターフェイスも提供します。

コメントAPIデータベーステーブル Comment API database table

フィールド	タイプ	デフォルト	情報
id	int(10)	auto-incrementing	このコメントのユニークID
userid	int(10)		このコメントの投稿者
contextid	int(10)		コンテクストテーブルで定義された コンテクストID - コメントの所有者であるプラグインのインスタンスを識別します。
itemid	int(10)		プラグイン固有のアイテムID (例: フォーラム投稿、ブログエントリ、課題提出等)
commentarea	int(10)		for example, in user profile, you can comment user's description or interests, but they share the same itemid(==userid), we need comment_area to separate them
timecreated	int(10)
timemodified	int(10)
content	text		content of comment

Use Comment API

format_text関数にオプションを追加する　Add an option to format_text function

Using this format_text function will add a comment icon automatically at the end of the text:

For example, using the following code in the forum module will add a comment icon to every post:

$cmt = new stdclass;
$cmt->contextid = $modcontext->id;
$cmt->area      = 'format_post';
$cmt->itemid    = $post->id;
$options->comments = $cmt;
echo format_text($post->message, $post->messageformat, $options, $course->id)."<hr />";

コメントクラスを使用する　Use comment class

To use Comment API elsewhere, using following code:

$options->area    = 'database_entry';
$options->context = $context;
$options->itemid  = $record->id;
$options->component = 'mod_data';
$options->showcount = true;
$comment = new comment($options);
$comment->output(false);

コメントAPI概要 Comment API overview

Generally speaking, only two functions you need to know to get comment API worked:

1. Use comment::init to initialize Comment API
2. Use $comment->output to display comments

The comment class has been implemented in comment/lib.php.

class comment()

__construct($contextid, $comment_area, $itemid))

Initialize class members

init()

It is a static function used to initialize comments, setting up languages, which must be called before html head printed

output($return = false)

Will print the html snippet for commenting interface, if set $return as true, it will return html string instead of printing out.

print_comments($params = array())

Used by non-javascript comment interface, will print a list of comments.

add($content)

Public instance funciton, add a comment to database, used in comment/comment_ajax.php

count()

Counting the number of comments

delete($id)

Delete a comment from database, used in comment/comment_ajax.php

delete_comments

Delete all comments in a specific contexts (like all comments belonging to a forum post)

Javascript API

Comment API implemented a YUI3 module M.core_comment to deal with the communication between browsers and moodle. It can be found in comment/comment.js

Call M.core_comment.init will create an instance of CommentHelper class. You don't need to make any calls to this instance, it simply works out of box.

Moodle modules callback

Comment API allows modules/blocks/blog to decide how comments display.

データ妥当性検証　Data validation

This callback method is required, it must be implemented. Otherwise, new comment will be rejected by default. Plugins must implement pluginname_comment_validate callback to validate comments parameters, it must return true to pass validation.

パーミッションコントロール　Permission control

Modules must implement function pluginname_comment_permissions to return post and view permission.

Blocks need to overwrite blockname_comment_permissions function of block_base.

Blog need to implement blog_comment_permissions function.

This function will return an array: array('post'=>true, 'view'=>true)

新しい追加コメントを確認する　Check new added comment

The callback function allows you to change the comment content before inserting into database or reject this comment.

It takes two arguments, the comment object which contains comment details, and $params which contains context and course information.

Modules can implement a function named modname_comment_add.

Blocks need to overwrite blockname_comment_add function.

Blog need to implement blog_comment_add function.

This function should return a boolean value.

コメントをフィルタ/フォーマットする　Filter/format comments

This callback allows modules check/format comments when user request to display comments.

It takes the same arguments as pluginname_comment_add

Modules can implement a function named pluginname_comment_display.

Blocks need to overwrite blockname_comment_display function.

Blog need to implement blog_comment_display function.

It will return the comment object.

コメントテンプレートを定義する　Define a comment template

Modules can implement a function named pluginname_comment_template, which allow modules define a comment template. The template must have 4 embedding variables, ___id___, ___content___, ___time___, ___name___, they will be replaced with html id, comments content, comment time and commenter name

バックアップおよびリストア　Backup and Restore

Comments will automatically be included in the activity/course backups and restored provided the itemids can be updated during the restore process. To do this either:

• do not use item ids and rely just on the context
• make the commentarea the same as one of the mappings in the restore (set_mapping); or
• override the function "get_comment_mapping_itemname" in the restore activity class

If you do not do one of these the comments will be silently ignored on restore.

関連情報

• コアAPI (Dev_docs)
• MDL-19118 - Comment API issue