fixed BUG-17 change parent and subs werent, now are. Also removed len(child/parent) and used functions IsChild(), IsParent() as I should have

BUGs

@@ -1,5 +1,4 @@
-#### BUGS (next-17)
+#### BUGS (next-18)
-BUG-17:		if change publisher, owned, covertype, condition, or blurb of parent book, then need to reflect that change to ALL sub books
 
 ### DB/back-end
 BUG-2:		series does not deal with calcd_rating... 

main.py

@@ -439,12 +439,13 @@ def new_book():
             book = Book( title=request.form['title'], owned=request.form['owned'], covertype=request.form['covertype'], condition=request.form['condition'], publisher=request.form['publisher'], year_published=request.form['year_published'], rating=request.form['rating'], notes=request.form['notes'], blurb=request.form['blurb'], genre=book_genres, author=book_authors )
             db.session.add(book)
             db.session.commit()
+			# this is a sub-book we have added
             if 'parent_id' in request.form:
                 db.engine.execute( "insert into book_sub_book_link ( book_id, sub_book_id, sub_book_num ) values ( {}, {}, (select COALESCE(MAX(sub_book_num),0)+1 from book_sub_book_link where book_id = {}) )".format( request.form['parent_id'], book.id, request.form['parent_id'] ) )
                 parent=Book.query.get(request.form['parent_id'])
-                print( parent.series )
                 if len(parent.series) > 0:
-                    print ("I think this means we have added a sub-book to something in a series already" )
+                    # we have added a sub-book to something in a series
+					# already, so add a bsl for the next book_num
                     for s in parent.bsl:
                         db.engine.execute( "insert into book_series_link ( series_id, book_id, book_num ) values ( {}, {}, (select COALESCE(MAX(book_num),0)+1 from book_series_link where series_id={}) )".format( s.series_id, book.id, s.series_id ) )
                 db.session.commit()
@@ -485,7 +486,7 @@ def book(id):
     if request.method == 'POST':
         if 'delete' in request.form:
             book = Book.query.get(id)
-            if len(book.child_ref) > 0:
+            if book.IsParent():
                 st.SetAlert( "danger" )
                 st.SetMessage( "This is a parent book, cannot delete it without deleting sub books first" )
                 return redirect( '/book/{}'.format(book.id) )
@@ -493,7 +494,7 @@ def book(id):
                 st.SetAlert("success")
                 st.SetMessage("Deleted {}".format(book.title) )
                 pid = 0
-                if len(book.parent) > 0:
+                if book.IsChild():
                     pid = book.parent[0].id
                 try:
                     db.session.delete(book)
@@ -548,6 +549,16 @@ def book(id):
                 for field in request.form:
                     if 'bsl-book_num-' in field and field != 'bsl-book_num-NUM' and request.form[field] == 'PARENT':
                         still_in_series=1
+                # go through children, and force sync any changes of physical parts of parent book
+                tmp_book=book_schema.dump(book)
+                for ch_ref in tmp_book['child_ref']:
+                    ch_bid=GetBookIdFromBookSubBookLinkByIdAndSubBookNum( book.id, ch_ref['sub_book_num'] )
+                    child_book=Book.query.get(ch_bid)
+                    child_book.publisher=book.publisher
+                    child_book.owned=book.owned
+                    child_book.covertype=book.covertype
+                    child_book.condition=book.condition
+                    child_book.blurb=book.blurb
 
             if book.IsChild() or (book.IsParent() and not still_in_series):
                 print ("okay should raise DBox")