Allowing specific users to only add posts using certain custom taxomy terms

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I was searching through the forums, but I can only find slightly related issues.

This is my problem:

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I’d like to assign some editors the capability to only add posts in a predefined term of a custom taxonomy.

I have made a taxonomy called events, which holds a list with events that are added by an admin. Certain users are only allowed to add posts using a single event, e.g. “Japan” or “Haiti”.

Anyone with a hint on how to tackle this? are there user management-plugins that have this kind of capabilities?

Regards,
Joost.

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3 comments

  1. First hook the save_post action: http://codex.wordpress.org/Plugin_API/Action_Reference/save_post

    Then check capabilities: You have docs on that right?

    Then get_the_terms for the $post_id provided by save_post and the taxonomy you want to check. http://codex.wordpress.org/Function_Reference/get_the_terms

    Then if they are using a term (see note below) they are not allowed to use either stop/delete the post, set a warning, or remove the term.

    Note: a taxonomy is a list of terms that can be applied to a post. Example: the taxonomy “Nation” would contain terms like “Mexico”, “France”, and “India”

  2. Great article here on user roles and user role management, for your case maybe look up adding a custom role to each user using WP_User_class or maybe even a new role with same capabilities as editor but + 1 of event_poster or something similar, the article is full of good stuff that you can reference.

  3. Wherever you’re displaying the taxonomies for selection by the user when he’s logged in (you’re assigning caps, so I guess the user should log in), just do a check like this… 

    if(current_user_can('your_custom_capability'))
    { 
      //display only those taxonomies that he should be allowed to post into
    }

    If you’re displaying the default categories/taxonomies list in the dashboard, then you need to look around for a filter that is applied while the categories/taxonomies are listed. I’ll check on that filter and see if I can find one.