Limit Subpages from specific template

The CMS Questions
1

Hey there,
Not sure if possible, so decided to ask here.

This is for the subpages in a parent page.
What I am trying to do is limit the user ability to create only 1 calendar page within the parent.

pages:
  sort: flip
  hide: true
  max: 5
  template:
    - calendar
    - custompage

The result I’m looking for is 1x Calendar subpage and 1-4 Custom Pages.

Any ideas?
Thanks in advance!

2

This can be achieved with role based Panel permissions: https://getkirby.com/docs/panel/permissions

In your example that would be something like:

<?php

// site/roles/editor.php
return [
  'name'        => 'Editor',
  'default'     => true,
  'permissions' => [
    '*'                 => true,
    'panel.page.create' => function() {

      if($this->target()->page()->intendedTemplate() == 'parent_template'
      && (($this->target()->page()->children()->filterBy('template', 'calendar')->count() >= 1 && $this->target()->blueprint() == 'calendar')
      || ($this->target()->page()->children()->filterBy('template', 'custompage')->count() >= 4 && $this->target()->blueprint() == 'custompage'))) {
        return false;
      } else {
        return true;
      }
    }
  ]
];
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