solved BUG-11 (adding to wrong parent book)

templates/book.html

@@ -131,14 +131,15 @@ function AddAuthorToBook(num) {
 			{{ book_form.id }}
         	{{ book_form.csrf_token }}
 			{% if b.parent|length %}
+				{{b.parent}}
 				<div class="form-row">
 					<label class="col-lg-2 col-form-label bg-secondary text-white">Parent Book:</label>
 					<div class="col">
 						<button disabled class="col btn btn-outline-primary">
-							<i><a href="/book/{{b.parent[0].id}}">{{b.parent[0].title}}</a></i>
+							<i><a href="/book/{{b.parent.id}}">{{b.parent.title}}</a></i>
 						</button>
 					</div>
-					<input type="hidden" name="parent_id" value="{{b.parent[0].id}}">
+					<input type="hidden" name="parent_id" value="{{b.parent.id}}">
 				</div>
 			{% endif %}
 			{% for key in keys %}