okay removed sub_book as a formal db.relationship, its too confusing, using raw sql for now. Still need to ensure ordering of sub_books based on book_id, sub_book_num AND need to pass enough sub_book fields that can vary so that jinja2 can show all subs of a book when editing any of them

templates/books.html

@@ -21,7 +21,11 @@
 	  <tbody>
       {% for book in books %}
         <tr>
-		  <td data-sort="{{book.id}}"><a href="/book/{{book.id}}">{{book.title}}</a></td>
+		  {% if book.sub_book_num is defined %}
+		  	<td data-sort="{{book.id}}"><a href="/book/{{book.id}}">&nbsp;&nbsp;&nbsp;&nbsp;{{book.title}}</a></td>
+		  {% else %}
+		  	<td data-sort="{{book.id}}"><a href="/book/{{book.id}}">{{book.title}}</a></td>
+		  {% endif %}
 		  <td>{{ book.author[0]['surname'] }}, {{book.author[0]['firstnames']}}</td>
 		  <td>{{ book.publisher[0]['name']}}</td>
 		  <td align="center">
@@ -42,6 +46,9 @@
 	{% else %}
 	<h3>Book</h1>
       <p>{{books.title}}, {{ books.author[0]['surname'] }}, {{books.author[0]['firstnames']}} </p>
+	  {% if books.sub_book is defined %}
+		  <p>sub_book is defined: {{books.sub_book}}</p>
+	  {% endif %}
 	{% endif %}
 
 	<!-- code to get bootstrap & bootstrap datatable to work -->