Gravity Forms - Prevent Multiple Form Entries Same User ID - php

Question

We are using Gravity Forms and need to prevent the user from accessing the form again after submission. This is the code we're using in the 'application.php' template:
<?php
if (get_current_user_id()) {
//lookup current application:
$query = "SELECT * FROM dg_application where user_id = " . get_current_user_id();
$dg_application = $wpdb->get_row( $query, ARRAY_A );
if ($dg_application["user_id"] && $dg_application["status"] == "Completed") {
// custom field
echo get_post_meta($post->ID, "form_complete_message", true);
} else {
//let Gravity Forms/WP do thier jobs
while ( have_posts() ) : the_post();
// Include the page content template.
get_template_part( 'template-parts/content', 'page' );
// End of the loop.
endwhile;
}
} else {
echo "Sorry. You must be logged in to view this form.";
}
?>
</main><!-- .site-main -->
<?php get_sidebar( 'content-bottom' ); ?>
But it's not working and not displaying the message like it should. The database name is correct. We are using a custom database. Any ideas why it might not be showing?

Answer 1

I have tried many ways. not sure this is the better way or not but it's working well for me.
This code will prevent form access for the current user if they already filled the form.
add_filter( 'gform_get_form_filter_3', 'custom_schedule', 10, 2 );
function custom_schedule( $form_string, $form ) {
$current_user = wp_get_current_user();
$search_criteria = array(
'status' => 'active',
'field_filters' => array( //which fields to search
array(
'key' => 'created_by', 'value' => $current_user->ID, //Current logged in user
)
)
);
$form_id = 3;
$entry = GFAPI::get_entries($form_id,$search_criteria);
if ( !empty($entry) ) {
$form_string = '<p>Sorry, you have reached the submission limit for this form.</p>';
}
return $form_string;
}