title: How to filter posts by user selected values?
body: <p>Hello I'm working on a blog where <strong>I want to filter my posts by the values in  wp_usermeta data table</strong>.</p>
  
  <p>When a user registering to my site, I want the user to select his/her favorite car manufacturer. Then I save that value in the wp_usermeta table.</p>
  
  <p>EX: if a user selects Toyota, I save that record in wp_usermeta table as follows</p>
  
  <p>user_id(column name)=2</p>
  
  <p>meta_key(column name)=brand</p>
  
  <p>meta_value(column name)=Toyota</p>
  
  <p>All my meta_values are post categories, in above case "Toyota" is a post category.</p>
  
  <p>Now I need to filter my blog posts according to that user selected meta_value in the wp_usermeta table.</p>
  
  <p>But I'm struggling to make a connection between postmeta and usermeta tables. </p>
  
  <p>What would be the best way to do it or are there have any better way to full fill my task?</p>
  
  <p>thanks.</p>