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I am creating a multi-user, multi-product, multi-product-category reservations engine proof of concept. As I need to build it really fast I am using Wordpress's custom post types to manage a lot of the data.

I have reached a cross roads as I have modelled individual reservations as a post type, however, as the ones who will be making said reservations may not be registered and/or will be users with the subscriber role. Is it possible for them to still create a reservations post type?

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Sure. I'd say that's readily possible. Are you doing this all custom or are you existing using plugins? (e.g. Gravity Forms has some nice add-ons that sound like they'd do a lot of what you've described). – Jonathan Wold Feb 7 '13 at 23:48

Read about roles and capabilities on codex: http://codex.wordpress.org/Roles_and_Capabilities

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While roles and capabilities might be related to a solution, merely pointing to the Codex page for those topics isn't a complete answer. Once you get a little bit of rep you can post this kind of thing as a comment. – s_ha_dum Feb 8 '13 at 1:28
@s_ha_dum I know, I would've written it in a comment, but couldn't do. – NeS Feb 8 '13 at 1:30

Assuming you have 'reservations' custom post type:

function my_add_capabilities() {
    $role_obj = get_role('subscriber');

As capabilities are stored in database, hook this function to the theme activation hook such as switch_theme to add capabilities only when theme is switched. You'll need to switch the theme to any other and back to yours in admin panel.

add_action('switch_theme', 'my_add_capabilities');

Function Reference/add_cap.

If you want to remove capabilities, use remove_cap function in likely manner. You need to run it once.

function my_remove_capabilities() {
    $role = get_role('subscriber');
add_action('admin_init', 'my_remove_capabilities');

Function Reference/remove cap

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