パーミッションのオーバーライド

再作成中です - Mitsuhiro Yoshida 2010年3月19日 (金) 14:20 (UTC)

オーバーライドは、必要に応じてあなたのパーミッションを「微調整」できるよう、コンテクスト内で特定のペーミッションをオーバーライドするために作られました。

オーバーライドは、ユーザに追加パーミッションを与えることで、エリアを「広げる」ために使用することができます。例えば、オーバーライドは、学生がフォーラムを評価できるよう、使用することができます (詳細は、フォーラムパーミッションをご覧ください)。

オーバーライドは、アーカイブフォーラムでの新しいディスカッションの開始等、操作を禁止することもできます。

パーミッションのオーバーライドのインターフェースは、関連するケイパビリティが表示される以外、ロールの定義のインターフェースに似ています。継承パーミッションは、ハイライトされます。

メモ: Moodle 1.9以前のバージョンでは、パーミッションのオーバーライドページ名は、「ロールのオーバーライド」となっています。

パーミッション

Override permissions in Moodle 1.9

There are four settings for each permission capability:

Inherit

The default setting. If a capability is set to inherit, the user's permissions remain the same as they are in a less specific context, or another role where the capability is defined. For example, if a student is allowed to attempt quiz questions at the course level, their role in a specific quiz will inherit this setting.

Allow

This enables a user to use a capability in a given context. This permission applies for the context that the role gets assigned plus all lower contexts. For example, if a user is assigned the role of student in a course, they will be able to start new discussions in all forums in that course (unless a forum contains an override with a prevent or prohibit value for the capability).

Prevent

By choosing this you are removing permission for this capability, even if the users with this role were allowed that permission in a higher context.

Prohibit

This is rarely needed, but occasionally you might want to completely deny permissions to a role in a way that can NOT be overridden at any lower context.

Locations for overriding permissions

• Front page context: "Override permissions" tab via Site Administration > Front Page > Front Page roles (in Moodle 1.8 onwards)
• Course category context: "Override permissions" tab via assign roles link in course categories page
• Course context: "Override permissions" tab via assign roles link in course administration block
• Module context: "Override permissions" tab in editing activity page
• Block context: "Override permissions" tab via assign roles link course block (with editing turned on)
• User context: "Override permissions" link via roles tab in user profile page

Ability to override permissions

Users who have the capability moodle/role:override allowed (or, in Moodle 1.9.3 onwards, the capability moodle/role:safeoverride allowed) can override permissions for selected roles (as set in Allow role overrides).

The default administrator role has the capability moodle/role:override allowed, and admins can override permissions for all other roles by default.

Enabling teachers to override permissions

By default, only administrators are able to override permissions. Teachers can be enabled to do so as follows:

1. Access Administration > Users > Permissions > Define roles.
2. Edit the teacher role and change the capability moodle/role:override (or moodle/role:safeoverride in Moodle 1.9.3 onwards) to allow.
3. Click the button "Save changes".
4. Click the tab "Allow role overrides" (in Administration > Users > Permissions > Define roles).
5. Check the appropriate box(s) in the teacher row to set which role(s) teachers can override. Most likely it will just be the student role (you don't want teachers to be able to override admins), so check the box where the teacher row intersects with the student column.
6. Click the button "Save changes".

If preferred, a new role for overriding permissions may be created and selected teachers assigned to it.

Overriding permissions for selected students

Sometimes a teacher will want to over ride permissions for selected students. Typically they will assign a student a role locally. For example, assign a student as a non-editing teacher. However, administrators can override specific permission in a role. This does not create a new role. It modifies an existing specific role and affects all users assigned to that role in the context.

Sometimes the administrator (or someone with the permissions to) will create a new role. For example, the administrator will copy all the student permissions to a new role, then change specific permissions. The teacher then assigns specific students to this role without having to worry about checking off the correct role permissions.

関連情報

• Useful things a teacher can do with roles
• Video showing how to enable teachers to override permissions
• Video showing how to override permissions in the course context