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I am trying to have a page (tag page) with this conditions:

  • query posts from a specific category (for example : products)
  • show only the posts with a selected tag (the tag is variable) not all the posts from that category.
  • You're using the tag archive index page? Do you always want to limit the query to the specified category, or only under certain conditions? Also, what have you tried? – Chip Bennett Mar 11 '14 at 17:57
  • @ChipBennett yes. i have tag , archive and index. i have a page with a list of some tags. i need when a user click on the tag it shows the list of all posts with clicked tag. – user48792 Mar 11 '14 at 18:22
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Since you're working with the tag archive index page query, this really won't be all that difficult. You simply need to filter the query parameters at pre_get_posts, using your criteria.

For example:

function wpse137627_pre_get_posts( $query ) {
    // If this is the tag archive index,
    // and is the main query
    if ( is_tag() && $query->is_main_query() ) {
        // Limit the query to the specified category
        // Change '123' (int) to the appropriate category ID
        $query->set( 'cat', 123 );
    }
}
add_action( 'pre_get_posts', 'wpse137627_pre_get_posts' );

You can also pass the category slug, using $query->set( 'category_name', 'cat-slug' ).

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