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I wrote a plugin Premium Posts that registers a custom taxonomy called sms_premium_posts and adds a column to the post list table in the WordPress administration area.

In that custom column, if a post has been marked Premium, the term Premium links to a filtered list of only premium posts. This link is generated using the query string:

http://www.example.com/wp-admin/edit.php?sms_premium_posts=premium

If a post is not marked as Premium, I would like the term Standard to filter the list so the table only shows posts that are NOT marked as premium (i.e. posts with no taxonomy terms).

Is there a query string for that?

Example query string:
http://www.example.com/wp-admin/edit.php?sms_premium_posts!=premium

You may ask, "Why not add the term Standard to all other posts?" My reason for not doing that is, it would require tagging all existing posts with a custom taxonomy term when the plugin is activated...which seems pretty inefficient.

Thanks in advance!

SOLUTION

Based on the answer from @s_ha_dum below, here is what I did to fake a negative query string:

function standard_term_filter( $query ) {
    if ( ! $query->is_admin )
        return $query;

    $term = isset( $_GET['sms_premium_posts!'] ) ? $_GET['sms_premium_posts!'] : null;
    if ( $term && 'premium' == $term ) {
        $taxquery = array(
            array(
                'taxonomy' => 'sms_premium_posts',
                'field'    => 'slug',
                'terms'    => 'premium',
                'operator' => 'NOT IN'
            )
        );
        $query->set( 'tax_query', $taxquery );
    }
    return $query;
}
add_action( 'pre_get_posts', array( $this, 'standard_term_filter' ) );

Note that I added this function as a method of my plugin class, which is why I used an array for the callback in add_action().

Also note the ! at the end of my query string term: sms_premium_posts!

I made my Standard term links look like this:

http://www.example.com/wp-admin/edit.php?sms_premium_posts!=premium

Since sms_premium_posts! is different than sms_premium_posts (the slug of my custom taxonomy), it works.

I wrote a plugin Premium Posts that registers a custom taxonomy called sms_premium_posts and adds a column to the post list table in the WordPress administration area.

In that custom column, if a post has been marked Premium, the term Premium links to a filtered list of only premium posts. This link is generated using the query string:

http://www.example.com/wp-admin/edit.php?sms_premium_posts=premium

If a post is not marked as Premium, I would like the term Standard to filter the list so the table only shows posts that are NOT marked as premium (i.e. posts with no taxonomy terms).

Is there a query string for that?

Example query string:
http://www.example.com/wp-admin/edit.php?sms_premium_posts!=premium

You may ask, "Why not add the term Standard to all other posts?" My reason for not doing that is, it would require tagging all existing posts with a custom taxonomy term when the plugin is activated...which seems pretty inefficient.

Thanks in advance!

SOLUTION

Based on the answer from @s_ha_dum below, here is what I did to fake a negative query string:

function standard_term_filter( $query ) {
    if ( ! $query->is_admin || ! isset( $_GET['sms_premium_posts!'] ) )
        return $query;

    if ( 'premium' == $_GET['sms_premium_posts!'] ) {
        $taxquery = array(
            array(
                'taxonomy' => 'sms_premium_posts',
                'field'    => 'slug',
                'terms'    => 'premium',
                'operator' => 'NOT IN'
            )
        );
        $query->set( 'tax_query', $taxquery );
    }
    return $query;
}
add_action( 'pre_get_posts', array( $this, 'standard_term_filter' ) );

Note that I added this function as a method of my plugin class, which is why I used an array for the callback in add_action().

Also note the ! at the end of my query string term: sms_premium_posts!

I made my Standard term links look like this:

http://www.example.com/wp-admin/edit.php?sms_premium_posts!=premium

Since sms_premium_posts! is different than sms_premium_posts (the slug of my custom taxonomy), it works.

I wrote a plugin Premium Posts that registers a custom taxonomy called sms_premium_posts and adds a column to the post list table in the WordPress administration area.

In that custom column, if a post has been marked Premium, the term Premium links to a filtered list of only premium posts. This link is generated using the query string:

http://www.example.com/wp-admin/edit.php?sms_premium_posts=premium

If a post is not marked as Premium, I would like the term Standard to filter the list so the table only shows posts that are NOT marked as premium (i.e. posts with no taxonomy terms).

Is there a query string for that?

Example query string:
http://www.example.com/wp-admin/edit.php?sms_premium_posts!=premium

You may ask, "Why not add the term Standard to all other posts?" My reason for not doing that is, it would require tagging all existing posts with a custom taxonomy term when the plugin is activated...which seems pretty inefficient.

Thanks in advance!

I wrote a plugin Premium Posts that registers a custom taxonomy called sms_premium_posts and adds a column to the post list table in the WordPress administration area.

In that custom column, if a post has been marked Premium, the term Premium links to a filtered list of only premium posts. This link is generated using the query string:

http://www.example.com/wp-admin/edit.php?sms_premium_posts=premium

If a post is not marked as Premium, I would like the term Standard to filter the list so the table only shows posts that are NOT marked as premium (i.e. posts with no taxonomy terms).

Is there a query string for that?

Example query string:
http://www.example.com/wp-admin/edit.php?sms_premium_posts!=premium

You may ask, "Why not add the term Standard to all other posts?" My reason for not doing that is, it would require tagging all existing posts with a custom taxonomy term when the plugin is activated...which seems pretty inefficient.

Thanks in advance!

SOLUTION

Based on the answer from @s_ha_dum below, here is what I did to fake a negative query string:

function standard_term_filter( $query ) {
    if ( ! $query->is_admin )
        return $query;

    $term = isset( $_GET['sms_premium_posts!'] ) ? $_GET['sms_premium_posts!'] : null;
    if ( $term && 'premium' == $term ) {
        $taxquery = array(
            array(
                'taxonomy' => 'sms_premium_posts',
                'field'    => 'slug',
                'terms'    => 'premium',
                'operator' => 'NOT IN'
            )
        );
        $query->set( 'tax_query', $taxquery );
    }
    return $query;
}
add_action( 'pre_get_posts', array( $this, 'standard_term_filter' ) );

Note that I added this function as a method of my plugin class, which is why I used an array for the callback in add_action().

Also note the ! at the end of my query string term: sms_premium_posts!

I made my Standard term links look like this:

http://www.example.com/wp-admin/edit.php?sms_premium_posts!=premium

Since sms_premium_posts! is different than sms_premium_posts (the slug of my custom taxonomy), it works.

I wrote a plugin (http://wordpress.org/plugins/premium-posts/) that registers a custom taxonomy called 'sms_premium_posts' and adds a column to the post table in WP-Admin.

In that custom column, if a post has been marked 'Premium', the term 'Premium' links to a filtered list of only premium posts. This link is generated using the query string:

http://mydomain.com/wp-admin/edit.php?sms_premium_posts=premium

If a post is not marked as 'Premium', I would like the term 'Standard' to filter the list so the table only shows posts that are NOT marked as premium (i.e. posts with no taxonomy terms).

Is there a query string for that? Something like:

http://mydomain.com/wp-admin/edit.php?sms_premium_posts!=premium

You may ask, "Why not add the term 'Standard' to all other posts?" My reason for not doing that is, it would require tagging all existing posts with a custom taxonomy term when the plugin is activated...which seems pretty inefficient.

Thanks in advance!

I wrote a plugin Premium Posts that registers a custom taxonomy called sms_premium_posts and adds a column to the post list table in the WordPress administration area.

In that custom column, if a post has been marked Premium, the term Premium links to a filtered list of only premium posts. This link is generated using the query string:

http://www.example.com/wp-admin/edit.php?sms_premium_posts=premium

If a post is not marked as Premium, I would like the term Standard to filter the list so the table only shows posts that are NOT marked as premium (i.e. posts with no taxonomy terms).

Is there a query string for that?

Example query string:
http://www.example.com/wp-admin/edit.php?sms_premium_posts!=premium

You may ask, "Why not add the term Standard to all other posts?" My reason for not doing that is, it would require tagging all existing posts with a custom taxonomy term when the plugin is activated...which seems pretty inefficient.

Thanks in advance!