Source code for https://formidable-masterminds.com/conditionally-show-form-or-edit-in-place-view-in-parent-view/

snippet.php

<?php

/* use the frm_display_entry_content filter hook to conditionally display the relationship form for
 * adding a new relationship record or relationship view for editing the relationship in place in the
 * media contacts view
 */
add_filter('frm_display_entry_content', 'media_contact_relationships', 20, 7);
function media_contact_relationships($new_content, $entry, $shortcodes, $display, $show, $odd, $atts) {
	if ( $display->ID == 14318 ) {
		$results = masterminds_check_relationships( $entry->id );
		if ( $results && $results !== 'Login') {
			$display_form_or_view = '[display-frm-data id=14593 filter=limited entry_id="' . $results . '"]';
		} else {
			if ( $results == 'Login' ) {
				$display_form_or_view = 'You must be logged in to view your relationship status with this media contact.';
			} else {
				$display_form_or_view = '[formidable id=31 contactid="' . $entry->id . '"]';
			}
		}
		/* string substitution to display either the form for adding a new record or view for displaying/editing existing relationship record
		 * or login message if user is not logged in
		 */
		$new_content = str_replace('[maybe_add_relationship]', $display_form_or_view, $new_content);
	}

	return $new_content;
}

/* function that checks if relationship record exists for specific media contact/user combination */
function masterminds_check_relationships( $entry_id ) {
	/* set up the custom query */
	global $wpdb;
	$frm_item_metas_tbl = $wpdb->prefix . 'frm_item_metas';
	/* parameter passed from media_contact_relationships(() */
	$contactid = $entry_id;
	/* get current user ID */
	$user = wp_get_current_user();
	
	/* if user is logged in, continue with display, otherwise display message to login */
	if ( $user->exists() ) {
		$sql = 'SELECT t1.item_id FROM `' . $frm_item_metas_tbl .'` t1 LEFT JOIN `' . $frm_item_metas_tbl .'` t2 ON t1.item_id = t2.item_id WHERE t1.field_id = "253" AND t1.meta_value = "' . $contactid . '" AND t2.field_id = "256" AND t2.meta_value = "' . $user->ID . '"';

		/* results will return either an item_id for an existing relationship record or null if no record found */
		$results = $wpdb->get_var( $sql );
		if ( null !== $results ) {
			return $results;
		} else {
			return false;
		}
	} else {
		return 'Login';
	}
}