Problem with Custom Post Type Categories

Question

Before I proceed on writing anything just have a look the following images. (snapshots)

I have one custom post type by name 'questions' just like we have 'posts/pages'. If you look at the image one, you can find that. And I found categories in that too. When I click on one of the categories in that (like Apostasy which has 1 article), I found that in categories of the questions (have a look at the image-2 for seeing that posts). Now, when I begin to edit that article (as you asked me in the question), I find 'categories on the right side as it supposed to be and it is no doubt have tick marks on the respected categories which my client needed. When I click on update. The questions are moving to the url fatwaa.com/questions/post-title. Whereas, when you look at the categories, you found zero posts.

I then soon back posted a test article in the 'Post' Section by ticking mark the respected category then without any difficulty I'm getting that in the category. I have edited one archive and tick mark one category into that and it is working without any difficulty.

So, I think the whole problem is causing due to this 'Questions Template'.

Also on the home page whenever I go to any category it is displaying same posts again and again..

(here is the code of the home page) http://pastebin.com/5LqnwAzY

Answer 1

If the Categories referred to here are the WordPress native category taxonomy, the queries for these term pages by default will only include the native post post type.

To add custom post types to category term queries, you can add a bit of code to your theme's functions.php file, which modifies these queries via the pre_get_posts action to add your custom post type:

function wpa_category_custom_type( $query ) {
    if ( $query->is_category() && $query->is_main_query() ) {
        $query->set( 'post_type', array( 'post', 'questions' ) );
    }
}
add_action( 'pre_get_posts', 'wpa_category_custom_type' );

The above assumes your post type is registered as questions.