get post parent id

Hi.
I’m trying to set the post parent, without knowing the post parent id, rather trying to set it by name. After the array has been inserted wp_insert_post, I’m trying to use the parent id to update_post_meta for the parent, as the child is added.

Here’s the code snippet:

$create_record_fields = array(
				'post_type' => 'records',
				'post_status' => 'publish',
				'post_category' => array(20),
				'post_parent' => $_POST["item-name"],
				'post_title' => $count + 1,
				'student_name' => $_POST["student_name"],
				'student_id' => $_POST["student_id"],
				'todays_date' => $_POST["todays_date"],
				'due_date' => $_POST["due_date"],
				'return_date' => $_POST["return_date"]
				);

			if (isset($_POST["submit"])) {
    			$new_post_id = wp_insert_post($create_record_fields);
    			$parent_id = wp_get_post_parent_id($new_post_id);
    			echo $parent_id;
    			update_post_meta( $new_post_id,  'wpcf-item-name', $_POST["item_name"] );
    			update_post_meta( $new_post_id,  'wpcf-student_name',  $_POST["student_name"] );
    			update_post_meta( $new_post_id,  'wpcf-borrow-record-id', $count + 1 );
    			update_post_meta( $new_post_id,  'wpcf-duedate', $due_date);
    			update_post_meta( $new_post_id,  'wpcf-student-id', $student_id);
    			update_post_meta( $new_post_id,  'wpcf-returndate', $_POST["return_date"]);
    			update_post_meta( $new_post_id,  'wpcf-borrowdate', $today);
    			update_post_meta( $new_post_id,  'wpcf-equipment-items', $_POST["item_name"]);
    			wp_set_object_terms( $new_post_id, 'borrow_records', 'record_types');
    			update_post_meta($parent_id, 'wpcf-status', $_POST["status"]);
    		}

the post data comes from here:

while ( have_posts() ) : the_post();

					// Include the page content template.
					get_template_part( 'content', 'page' );

					?>
					<form name="create_record" method="post" action="">
			<ul>
			<li>Student Name:<input type="text" name="student_name"></input></li><br>
			<li>Item Name:<input type="text" name="item_name"></input></li><br>
			<li>Item Status:<br>
			<input type="radio" name="status" value="1">In<br>
			<input type="radio" name="status" value="2">Out<br>
			<input type="radio" name="status" value="3">Broken<br>
			</li>
			<li>Return Date:<input type="text" name="return_date"></input></li><br>
			<li>Checkout Staff:<input type="text" name="checkout_staff"></input></li><br>
			<li>Checkin Staff:<input type="text" name="checkin_staff"></input></li><br>
			<input name='submit' type='submit'>
			</ul>
			</form>
						<?php