Problem:
How to count posts a certain user has created, and unhallow the user to create more then one of the given Posts?
Solution:
1. Create a CRED Form with which you let the user create your post.
2. Display the Link to that CRED somewhere on your site
3. Create a Custom PHP function to evaluate the amount of Posts created by the currently logged in user.
/**
*Count posts of given type, so each user can create post only once
*/
function u_post_count() {
$user_post_count = count( get_posts( array(
'post_type' => 'your_post_type_slug',
'author' => get_current_user_id(), //this will count the posts of the current logged in user
) ) );
return $user_post_count;//this returns a numerical value of Posts created by that user
}4. Register this function in Views > Settings > Compatibility > 3rd Party Functions
5. Use it in a wpv-conditional as elaborated here:
https://toolset.com/documentation/user-guides/conditional-html-output-in-views/ > Using Custom Functions Or Class Methods
6. Wrap the CRED Form / link with above conditional
Optional:
You can access also the Parent of the Current Post by querying the meta_key "_wpcf_belongs_your-parent-post-type-slug_id" and meta_value "Post ID" (the ID of the parent Post)
So your code can look like this:
/**
*Count posts of given type, so each user can create post only once
*/
function u_post_count() {
$post_id = $post->ID; //get current post ID
$user_post_count = count( get_posts( array(
'post_type' => 'your_post_type_slug', //child post type
'meta_key' => '_wpcf_belongs_your-parent-post-type-slug_id',
'meta_value' => $post_id,
'author' => get_current_user_id(), //this will count the posts of the current logged in user
) ) );
return $user_post_count;//this returns a numerical value of Posts created by that user
}
Relevant Documentation:
https://codex.wordpress.org/Template_Tags/get_posts
https://codex.wordpress.org/Template_Tags/get_posts
https://codex.wordpress.org/Function_Reference/get_current_user_id
http://php.net/manual/en/function.count.php
https://toolset.com/documentation/user-guides/creating-cred-forms/
