Problem: I would like to establish relationships between two posts in a New Post Form.
Solution: It's not currently possible to manage M2M relationships in a Post Form, you must create a Relationship Form. To predefine the values, you can use the parent_item and child_item shortcode attributes in the cred_relationship_form shortcode:
[cred-relationship-form form='form-relationship-zoukers-events' parent_item='[wpv-post-id id="$current_page"]' child_item='[wpv-view name="get-zouker-id"]']
The View must return the correct Post ID for the child item, and must have no empty spaces in the loop editor markup:
[wpv-layout-start][wpv-items-found]<!-- wpv-loop-start --><wpv-loop>[wpv-post-id]</wpv-loop><!-- wpv-loop-end -->[/wpv-items-found][wpv-no-items-found][/wpv-no-items-found][wpv-layout-end]
Finally you must apply this custom filter that strips out additional markup from the View's results so it can be used as a shortcode attribute:
add_filter( 'wpv_filter_wpv_view_shortcode_output', 'prefix_clean_view_output', 5, 2 );
function prefix_clean_view_output( $out, $id ) {
$ids = array( 123 );
if ( in_array( $id, $ids )) {
$start = strpos( $out, '<!-- wpv-loop-start -->' );
if (
$start !== false
&& strrpos( $out, '<!-- wpv-loop-end -->', $start ) !== false
) {
$start = $start + strlen( '<!-- wpv-loop-start -->' );
$out = substr( $out , $start );
$end = strrpos( $out, '<!-- wpv-loop-end -->' );
$out = substr( $out, 0, $end );
} else {
$start = strpos( $out, '>' );
if ( $start !== false) {
$out = substr( $out, $start + 1 );
$end = strpos( $out, '<' );
$out = trim(substr( $out, 0, $end ));
}
}
}
return $out;
}
Relevant Documentation:
https://toolset.com/documentation/post-relationships/how-to-build-front-end-forms-for-connecting-posts/
