title: Where to enter custom fields meta_key for customized archives?
body: <p>I have a post_type called books, which has custom fields for author name, publisher name, etc. </p>
  
  <p>I want to create pages where publisher or authors are grouped. For example, "Penguin" or "McGraw Hill". When a user clicks on "Penguin" out of the Publisher dropdown, she should see all the books by Penguin for example. </p>
  
  <p>To do this, I want to try a query like this: </p>
  
  <pre><code>    $args = array(
          'meta_key' =&gt; 'publisher'
          ,'meta_key_value' =&gt; 'Penguin'
          ,'taxonomy' =&gt; 'book'
          ,'orderby' =&gt; 'date'
          ,'posts_per_page' =&gt; 48
          ,'paged' =&gt; get_query_var('page')
      );
  
      $my_query = new WP_Query( $args );
  </code></pre>
  
  <p>My question is: where should I put this query? In the "category.php" or "archive.php"? And what will the link in the header look like? </p>
  
  <p>Thanks! </p>