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{{Roles}}
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Overrides are specific permissions designed to override a role in a specific context, allowing you to "tweak" your permissions as required.


Overrides are specific permissions designed to override a role in a specific context, allowing you to "tweak" your permissions as required. Overriding does not create a new role. It modifies an existing role and affects all users assigned to that role in the context.
Overrides may be used to "open up" areas by giving users extra permissions. For example, an override may be used to enable students to rate forum posts (see [[Forum settings]] for details).


[[Image:Override permissions.png|center|frame|Override permissions in Moodle 1.9]]
Overrides may also be used to prevent actions, such as starting new discussions in an archived forum.


==Permissions==
[[Image:Override permissions.png|thumb|Override permissions in Moodle 2.2]]
There are four settings for each permission capability:


For example, users with the Student role can normally start new discussions in forums.  Suppose there is a particular forum in which you want to restrict this capability. Within the forum, set an override that PREVENTS the capability for Students to "Start new discussions."
;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. Ultimately, if permission is never allowed at any level, then the user will have no permission for that capability.  


If you want to prevent only a few selected students from starting discussions in the forum, you cannot do it by overriding the Student role, since doing so would affect all Students.  You need a new role. Unfortunately, you (as a teacher) cannot create one.  Only the administrator can create new roles.  The best solution is to ask the administrator to create a copy of the Student role.  Then, within the forum, override the copied role as described in the paragraph above.  Finally, assign the selected students to this role within the forum.
;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).


Overrides can also be used to "open up" areas of your site and courses to give users extra permissions where it makes sense. For example, you may want to experiment giving Students the ability to grade some assignments.
;Prevent
:By choosing this you are removing permission for this capability (only for this role), even if the users with this role were allowed that permission in a higher context. If any other role allows the same capability, even for a higher or lower context, this prevent will have no effect.


The interface for overriding permissions is similar to the one for defining roles, except sometimes only relevant capabilities are shown, and you will also see some capabilities highlighted to show you what the permission for that role would be WITHOUT any override active (i.e. when your override is set to NOT SET).
;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. An example of when you might need this is when an admin wants to prohibit one person from starting new discussions in any forum on the whole system. In this case they can create a role with that capability set to "Prohibit" and then assign it to that user in the system context.


Note: Prior to Moodle 1.9, the override permissions page was named "Override roles".
==Conflict resolution of permissions==


==Enabling teachers to override permissions==
Permissions at a "lower" context will generally override anything at a "higher" context (this applies to overrides and assigned roles). The exception is PROHIBIT which can not be overridden at lower levels.


By default, only administrators are able to override permissions. You can enable teachers to do so as follows:
If two roles are assigned to a person in any context, one with ALLOW and one with PREVENT, then ALLOW will win.
#Access ''Administration > Users > Permissions > Define roles''
#Edit the teacher role and change the capability [[Capabilities/moodle/role:override|moodle/role:override]] to allow


[[Image:Overridepermissions.jpg|center|frame|[[Capabilities/moodle/role:override|moodle/role:override]] to allow]]
===Special exceptions===


3. Click the button "Save changes"
Note that the guest user account will generally be prevented from posting content (eg forums, calendar entries, blogs) even if it is given the capability to do so.
4. Click the tab "Allow role overrides" (in ''Administration > Users > Permissions > Define roles'')


[[Image:Overridepermissions2.jpg|center|frame|Allow role overrides]]
==Locations for overriding permissions==


5. Check the appropriate box to allow a teacher to override the student role
*Front page context: ''Administration > Front Page settings > Users > Permissions''
6. Click the button "Save changes"
*Course category context (when used):''Category > Administration > Permissions''
*Course context: ''Administration > Course administration > Users > Permissions''
*Module context: (from the chosen module) ''Administration > Module administration > Permissions''
*Block context: (from the chosen block) ''Administration > Block administration > Permissions''
*User context: (from the user's profile) ''Administration > Roles > Permissions''


If preferred, a new role for overriding permissions may be created and selected teachers assigned to it.
==Ability to override permissions==
 
Users who have the capability [[Capabilities/moodle/role:override|moodle/role:override]] allowed or the capability [[Capabilities/moodle/role:safeoverride|moodle/role:safeoverride]] allowed) can override permissions for selected roles (as set in [[Allow role overrides]]).
 
The default manager role has the capability moodle/role:override allowed, and can override permissions for all other roles.
 
The default teacher role has the capability moodle/role:safeoverride allowed, and can override permissions for the roles of non-editing teacher, student and guest.
 
==Enabling non-editing teachers to override safe permissions==
 
#Access ''Administration > Site Administration > Users > Permissions > Define roles''.
#Edit the non-editing teacher role and change the capability [[Capabilities/moodle/role:safeoverride]] to allow.
#Click the button "Save changes".
#Click the tab "Allow role overrides" (in ''Administration > Site administration > Users > Permissions > Define roles'').
#Check the appropriate box(s) in the non-editing teacher row to set which role(s) they can override. Most likely it will just be the student role (you don't want non-editing teachers to be able to override managers), so check the box where the non-editing teacher row intersects with the student column.
#Click the button "Save changes".
 
If preferred, a new role for overriding permissions may be created and selected non-editing 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, managers 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.


==See also==
==See also==
*[http://www.moodletutorials.org/view_video.php?viewkey=cc25a6f606eb525ffdc5 Demonstrates how to enable teachers to override permissions]
*[http://www.youtube.com/watch?v=ovUupexJM0Q Video tutorial on overriding the student role]


[[cs:Přenastavení oprávnění]]
* Using Moodle [http://moodle.org/mod/forum/discuss.php?d=199435 Course role which revokes capability granted in a sitewide role] forum discussion
[[es:Anular_roles]]
 
[[es:Anular permisos]]
[[eu:Baimenak_kendu]]
[[fr:Définir des dérogations aux rôles]]
[[fr:Définir des dérogations aux rôles]]
[[ja:ロールのオーバーライド]]
[[ja:ロールのオーバーライド]]
[[ru:Переопределение ролей]]
[[de:Zugriffsrechte ändern]]

Latest revision as of 05:59, 27 August 2015


Overrides are specific permissions designed to override a role in a specific context, allowing you to "tweak" your permissions as required.

Overrides may be used to "open up" areas by giving users extra permissions. For example, an override may be used to enable students to rate forum posts (see Forum settings for details).

Overrides may also be used to prevent actions, such as starting new discussions in an archived forum.

Permissions

Override permissions in Moodle 2.2

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. Ultimately, if permission is never allowed at any level, then the user will have no permission for that capability.
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 (only for this role), even if the users with this role were allowed that permission in a higher context. If any other role allows the same capability, even for a higher or lower context, this prevent will have no effect.
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. An example of when you might need this is when an admin wants to prohibit one person from starting new discussions in any forum on the whole system. In this case they can create a role with that capability set to "Prohibit" and then assign it to that user in the system context.

Conflict resolution of permissions

Permissions at a "lower" context will generally override anything at a "higher" context (this applies to overrides and assigned roles). The exception is PROHIBIT which can not be overridden at lower levels.

If two roles are assigned to a person in any context, one with ALLOW and one with PREVENT, then ALLOW will win.

Special exceptions

Note that the guest user account will generally be prevented from posting content (eg forums, calendar entries, blogs) even if it is given the capability to do so.

Locations for overriding permissions

  • Front page context: Administration > Front Page settings > Users > Permissions
  • Course category context (when used):Category > Administration > Permissions
  • Course context: Administration > Course administration > Users > Permissions
  • Module context: (from the chosen module) Administration > Module administration > Permissions
  • Block context: (from the chosen block) Administration > Block administration > Permissions
  • User context: (from the user's profile) Administration > Roles > Permissions

Ability to override permissions

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

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

The default teacher role has the capability moodle/role:safeoverride allowed, and can override permissions for the roles of non-editing teacher, student and guest.

Enabling non-editing teachers to override safe permissions

  1. Access Administration > Site Administration > Users > Permissions > Define roles.
  2. Edit the non-editing teacher role and change the capability Capabilities/moodle/role:safeoverride to allow.
  3. Click the button "Save changes".
  4. Click the tab "Allow role overrides" (in Administration > Site administration > Users > Permissions > Define roles).
  5. Check the appropriate box(s) in the non-editing teacher row to set which role(s) they can override. Most likely it will just be the student role (you don't want non-editing teachers to be able to override managers), so check the box where the non-editing 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 non-editing 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, managers 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.

See also