Hi @henderson7,

There are a couple of ways to go about creating a new filter, just depends on how complicated you want to get with it.

1. Simple new filter with no options
When this is added to a query this will automatically add the parameter “author = current user ID”.

<?php
// Register new filter with Query Wrangler.
add_filter( 'qw_filters', 'qw_filter_author_is_current' );

function qw_filter_author_is_current( $filters ) {
  $filters['author_is_current'] = array(
    'title' => 'Author is current user',
    'description' => 'Filter posts by current user as the post author',
    'query_args_callback' => 'qw_generate_query_args_author_is_current',
    'query_display_types' => array( 'page', 'widget' ),
  );
  return $filters;
}

// Modify the query arguments before the query is executed.
function qw_generate_query_args_author_is_current( &$args, $filter ) {
  $args['author'] = get_current_user_id();
}

2. Slightly more complicated, a filter with options

This version let’s you choose the between “Is current user” and “Is Not current user”.

<?php
// Register new filter with Query Wrangler.
add_filter( 'qw_filters', 'qw_filter_author_is_current' );

function qw_filter_author_is_current( $filters ) {
  $filters['author_is_current'] = array(
    'title' => 'Author is current user',
    'description' => 'Filter posts by current user as the post author',
    'query_args_callback' => 'qw_generate_query_args_author_is_current',
    'query_display_types' => array( 'page', 'widget' ),
    'form_callback' => 'qw_filter_author_is_current_form',
  );
  return $filters;
}

// Provide an option form for the filter.
function qw_filter_author_is_current_form( $filter ) {
  if ( empty( $filter['values']['operator'] ) ) {
    $filter['values']['operator'] = 'author__in';
  }
  ?>
  <strong>Operator:</strong>
  <select
    class="qw-field-value  qw-js-title"
    name="<?php print $filter['form_prefix']; ?>[operator]">
    <option value="author__in" <?php selected( $filter['values']['operator'], 'author__in' ) ?>>
      Author is current user
    </option>
    <option value="author__not_in" <?php selected( $filter['values']['operator'], 'author__not_in' ) ?>>
      Author is NOT current user
    </option>
  </select>
  <?php
}

// Modify the query arguments before the query is executed.
function qw_generate_query_args_author_is_current( &$args, $filter ) {
  if ( empty( $filter['values']['operator'] ) ) {
    $filter['values']['operator'] = 'author__in';
  }
  $args[ $filter['values']['operator'] ] = [ get_current_user_id() ];
}

3. Use the existing “Callback” filter, and provide it with a simple function.

This is the simplest way to go, but is a little more brittle than providing an actual new QW filter.

function my_custom_callback_author_is_current( $args, $filter ) {
  $args['author'] = get_current_user_id();
  return $args;
}

—-

Hope this helps. I’m also happy to add something like this to the plugin if you’d like. Depending on your level of comfort, you’re welcome to submit a pull request to the GitHub repo (https://github.com/daggerhart/query-wrangler), or I can create it.

– Another filter example: https://github.com/daggerhart/query-wrangler/blob/master/docs/examples/filter.md