Unable to save Query Vars with a post

Question

I'm trying to save Query Vars to a post for later retrieval.

I'm using permalinks in this format: domain.com/%category%/%postname%/

Example:

1. I create a following page

   domain.com/page-003/
   

2. I add Query Var called email to the page

   add_query_arg('email', '[email protected]', 'domain.com/page-003/')
   

3. Now when I call

   get_permalink($post_id);
   

   I get

   domain.com/page-003/
   

   Instead of

   domain.com/page-003/[email protected]
   

What am I missing? Aren't Query Vars saved with a post?

Answer 1

You want to save some meta data which you want to restore later on and add as query arg into the URL.

You need to first save it as post_meta like e.g. when you save post with that data. You use:

<?php update_post_meta(get_the_ID(), 'email_address', '[email protected]'); ?>

More details: https://codex.wordpress.org/Function_Reference/update_post_meta

Then during the retrieval, you may hook into a HOOK early on like template_redirect or earlier of the post you can get post_meta to get the email and then add to query arg:

<?php $email = get_post_meta( get_the_ID(), 'email_address' ); ?>

Then

esc_url( add_query_arg( 'email', $email, get_permalink( get_the_ID() ) ) );

Something like that, code is untested, I just wrote here, you may please read detailed doc in codex for each function used above.

Update: How to update/fill Ninja form field from Meta Value:

add_filter( 'ninja_forms_render_default_value', 'wm_the_value' , 10 , 3);

function wm_the_value( $default_value, $field_type, $field_settings ) {
    if( 'textbox' == $field_type && in_array('ref' , $field_settings)){
        $default_value = get_post_meta(get_the_ID(),'_listing_mls', true);
    }

    return $default_value;
}

'ref' is field name in Ninja form. '_listing_mls' is meta_key name from WP database.

Hope it works for you.