Laravel UpdateOrCreate method returns empty values - php

Question

I have three tables: books, editions, and listings.
I have one form where a user can select a book, then a book edition and all of the fields (title, author, year, publisher, edition year, etc.) fill in automatically. If the user selects "My book isn't on this list", then he has to fill in the fields himself. The fields related to the listings table have to be filled by the user himself in any case:
this is how the form looks like
I'm trying to use the Laravel UpdateOrCreate method on submit, so only the new information is added to the database:
public function store(Request $request) {
Book::UpdateOrCreate([
'id' => $request->get('id'),
],
[
'book_title' => $request->get('book_title'),
'book_author' => $request->get('book_author'),
'book_description' => $request->get('book_description'),
'book_year' => $request->get('book_year'),
'book_language' => $request->get('book_language'),
]);
Edition::UpdateOrCreate([
'id' => $request->get('eid'),
],
[
'book_id' => $request->get('id'),
'image_url' => $request->get('image_url'),
'publisher' => $request->get('publisher'),
'edition_year' => $request->get('edition_year'),
'pages' => $request->get('pages'),
'cover_type' => $request->get('cover_type'),
]);
$listing = new Listing();
$listing->user_id = $request->get('user_id');
$listing->edition_id = $request->get('eid');
$listing->listing_description = $request->get('listing_description');
$listing->price = $request->get('price');
$listing->condition = $request->get('condition');
$listing->shipping_type = $request->get('shipping_type');
$listing->image_url = $request->get('listing_image');
$listing->save();
return redirect()->route('new-listing')->with('message', 'Listing added succesfuly!');
}
This is what automatically fills the input fields (just regular inputs with name attributes such as book_title, book_author and the rest that are in my UpdateOrCreate method above.
<div class="row">
<?php
header('Content-Type: text/html; charset=utf8');
$servername = "localhost";
$username = "thriftyourbook-user";
$password = "123";
$dbname="thriftyourbook";
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$conn = new mysqli($servername, $username, $password, $dbname);
mysqli_set_charset($conn, "utf8");
$qu = "SELECT book_title,book_author,book_description,book_year,book_language,id FROM books ORDER BY book_title";
$res = $conn->query($qu);
$q = "SELECT e.image_url,e.publisher,e.edition_year,e.pages,e.cover_type,e.id,b.book_title FROM editions as e JOIN books as b ON e.book_id = b.id ORDER BY b.book_title";
$re = $conn->query($q);
?>
<div class="form-group col-6">
<label for="book">{{ __('l.selectbook') }}</label>
<select id="book" class="form-control" name="book" onchange="bookInfo()">
<option value="no">{{ __('l.onthislist') }}</option>
<?php
while($r = mysqli_fetch_row($res))
{
echo "<option value=\"yes\" data-id=\"$r[5]\" data-ttl=\"$r[0]\" data-auth=\"$r[1]\" data-desc=\"$r[2]\" data-yr=\"$r[3]\" data-lang=\"$r[4]\" value=\"$r[5]\"> $r[0] </option>";
}
?>
</select>
</div>
<div class="form-group col-6" id="edition-field-div">
<label for="edition">{{ __('l.selectedition') }}</label>
<select id="edition" class="form-control" onchange="editionInfo()">
<option value="no">{{ __('l.editionnotlist') }}</option>
<?php
while($r = mysqli_fetch_row($re))
{
echo "<option value=\"yes\" data-img=\"$r[0]\" data-pblshr=\"$r[1]\" data-eyr=\"$r[2]\" data-pg=\"$r[3]\" data-cov=\"$r[4]\" data-eid=\"$r[5]\" data-titl=\"$r[6]\" value=\"$r[5]\">
$r[6] ($r[1], $r[2], $r[3] pages, ";
if ($r[4] == 'HC') {
echo "Hardcover) </option>";
} elseif ($r[4] == 'PB') {
echo "Paperback) </option>";
}
}
?>
</select>
</div>
</div>
No errors are returned, but every time I submit the form, every field related to the books or editions table becomes empty. Only the listing information is filled correctly.
Thanks in advance for any help! :)