now handle series book numbering in the books on shelf page. Fixes BUG-22

main.py

@@ -13,6 +13,7 @@ from flask_login import LoginManager, login_user, login_required, UserMixin, cur
 from flask_ldap3_login.forms import LDAPLoginForm
 import re
 import os
+import contextlib
 
 ####################################### Flask App globals #######################################
 app = Flask(__name__)
@@ -767,9 +768,51 @@ def rem_parent_books_from_series(pid):
 @app.route("/books_on_shelf", methods=["GET"])
 @login_required
 def books_on_shelf():
+    # start with all books owned, but it includes sub-books, so remove them...
     books = Book.query.join(Owned).filter(Owned.name=='Currently Owned').all()
     RemSubs(books)
-    return render_template("books.html", books=books, page_title="Books on Shelf", order_by="Author(s)", show_cols='', hide_cols='' )
+
+    # now we order them (they are in author order, but not inside that authors list)
+
+    # because a book can be in multiple series, without any ordering we need to find
+    # any book that is in a series, then go through each series to find the one with
+    # the most books in it.  THEN we need to get all those books and put them in the
+    # ordered_books array, and remove them from the books array
+    ordered_books=[]
+    handle_parent=[]
+    currently_owned = Owned.query.filter(Owned.name=='Currently Owned').one()
+    print( f"co={currently_owned}" )
+    for b in books:
+        if b.series:
+            # find biggest Series
+            max_num_books=0
+            for s in b.series:
+                if max_num_books < s.num_books:
+                    max_num_books = s.num_books
+                    max_series_id= s.id
+
+            #order all books (sub-books too here!) in this series with the most books
+            bsl=Book_Series_Link.query.filter( Book_Series_Link.series_id==max_series_id ).order_by(Book_Series_Link.book_num).all()
+            for tmp in bsl:
+                tmp_b = Book.query.get(tmp.book_id)
+                # skip any books that are not owned sneaking back in
+                if tmp_b.owned != currently_owned.id:
+                    continue
+                if tmp_b.IsChild():
+                    # this child book wont be in books, but its parent will -> use it instead
+                    if tmp_b.parent[0].id not in handle_parent:
+                        books.remove(tmp_b.parent[0])
+                        ordered_books.append(tmp_b.parent[0])
+                        handle_parent.append(tmp_b.parent[0].id)
+                else:
+                    if tmp_b.id not in handle_parent:
+                        books.remove(tmp_b)
+                        ordered_books.append(tmp_b)
+        else:
+            # book not in a series or a sub-book, so just add this book to the ordered list
+            ordered_books.append(b)
+
+    return render_template("books.html", books=ordered_books, page_title="Books on Shelf", order_by="Author(s)", show_cols='', hide_cols='' )
 
 @app.route("/unrated_books", methods=["GET"])
 @login_required