Roles and Capabilities for Custom Post Types

WordPress access rights are controlled by Roles and Capabilities. To perform an action, your user role must have that capability. For example, to edit posts, your role must have edit_posts assigned to it.

Custom Taxonomies

Strangely, while managing terms for custom taxonomies requires manage_categories, this does not give the user the right to assign terms to the post. To allow that, add

'capabilities' => array('assign_terms' => 'edit_sermons')

to the arguments array of register_taxonomy(). Replace the word “sermons” with whatever you want to name this capability. Naming it edit_sermons means that the user who can edit sermon custom post types will also be able to assign terms belonging to this taxonomy.

Custom Post Types

Posts and pages have built in capabilities for editing, adding, publishing etc etc. To restrict custom post types, it’s necessary to assign them a new bunch of capabilities. Do this by adding the following code to the array of arguments.

'capability_type' => 'sermon',
'map_meta_cap' => true

The map_meta_cap key is necessary so that edit_sermons, delete_sermons and add_sermons will work as expected.

This is explained in Justin Tadlock’s article, but he had to do it manually then.

Assign Capabilities

Use the Members plugin to create roles and assign capabilities. When assigning capabilities, give edit_{capability_type}, publish_{capability_type}, but add an ‘s’ after that (plural form).

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