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See #3521#note-5.
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Any news on this or maybe a patch which could handle this?
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"No more comments when ticket closed" according to the role in fields permissions.
why not fixing this feature?
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In my opinion, this could be implemented with option 'comments allowed' and 'comments disallowed' when an issue is closed. This could be done for each issue and/or globally and/or per project.
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A first patch would help me ... ;)
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To get this idea widely...

There could be added a new member in the issues table, par example 'comments_allowed' of type @TINYINT(1)@ and it should be set to TRUE when creating new issue. Then

* associate a checkbox in the edit issue dialog
* associate permissions for access of 'comments_allowed'.
* add a menu item in the context menu for allow / disallow.
* add a global configuration option about 'disallow comments on closing issues'.
* add a project configuration option about 'disallow comments on closing issues'.
* add a project configuration option about which setting is with bigger priority: the global one or project one. (is needed?)
* add code that calculates above conditions and sets or clears 'comments_allowed'.

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I needed that recently, attaching a simplistic patch adding a permission.

For the record, I don't know a thing about Rails, just needed a quick hack.
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I have added this feature to the plugin "Redmine tweaks":http://www.redmine.org/plugins/redmine_tweaks.
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Hello

We need some help to this topic again.

Installing the patch with the command written above works.
After the installation and a restart of the server it is still possible to comment on closed issues…
I tried to understand “what the patch” is doing and check if that worked.

Due to formatting problems, please see attached pdf-file.

Thanks in advance for further tips.
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+1

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We created a workaround using the view customize plugin.
I hope this helps.

https://redmine.tokyo/issues/235#note-9

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I've been looking for this as well.
And I just realised the additionals plugin actually implements this functionality: https://www.redmine.org/plugins/additionals
I can confirm it works. Make sure role you want to prevent from editing closed issues does not have "Edit closed issues" permission assigned.
Configure the additionals plugin at: /settings/plugin/additionals?tab=rules
The option is called "Disallow editing of closed issues (Freeze)".
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Marji Cermak wrote:
> I've been looking for this as well.
> And I just realised the additionals plugin actually implements this functionality: https://www.redmine.org/plugins/additionals
> I can confirm it works. Make sure role you want to prevent from editing closed issues does not have "Edit closed issues" permission assigned.
> Configure the additionals plugin at: /settings/plugin/additionals?tab=rules
> The option is called "Disallow editing of closed issues (Freeze)".

Agreed. I have been using the plugin for last few weeks for this specific reason and it does exactly what OP asks for.
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relates,Closed,7557,Deny editing of descriptions of closed issues
relates,New,2685,Display notice when commenting on closed tickets
relates,Closed,3521,Permissions for roles to change fields per tracker/status
relates,New,33868,Prevent adding notes to closed issues
duplicates,Closed,18382,Disable closed issues for commenting
duplicates,Closed,27036,Ticket status closed