made RemoveDuplicateAuthorInForm() func to remove duplicate code

BUGs

@@ -1,11 +1,7 @@
 #### BUGS (next-46)
 
 BUG-41:     failed to add a book with 2 x same series - implement same fix as for duplicate authors (search for processed_bal) - should 
-            actually turn processed_bal into a function, as its used twice, and maybe able to make it 4 times for series as well if think hard enough.  
-            e.g.  
-                bals, message = RemoveDuplicatesFromForm( what )
-                # what == "author" or "series" and then hardcode 'author-' or 'book-bsl-'
-            ALSO stop being inconsistent its bal or bals?
+            actually turn processed_bal into a function, as its used twice, then do similar for series
 
 BUG-42:     bug-7 removed as bug-41 covers the more useful version of this AND what we also need (this bug) is not allowing adding a 
             sub_book_num for a series that has already been taken -- not sure the DB enforces either

main.py

@@ -557,6 +557,29 @@ def remove_sub_book():
         st.SetMessage( e.orig )
         return redirect( '/book/{}'.format(request.form['rem_sub_sub_book_id']) )
 
+################################################################################
+# Go through request.form, find author's and remove any that are duplicates as
+# that is not allowed / DB integrity issue.   This just sets a message that
+# will allow the book to be create/saved still, but the duplicate author will
+# be removed
+################################################################################
+def RemoveDuplicateAuthorInForm( request ):
+    processed=[]
+    ret=[]
+    cnt=1
+    message=""
+
+    for el in request.form:
+        if 'author-' in el:
+            if not request.form[el] in processed:
+                ret.append( Book_Author_Link( author_id=request.form[el], author_num=cnt ) )
+                processed.append( request.form[el] )
+                cnt+=1
+            else:
+                message="Removed duplicate Author!!!"
+    return ret, message
+
+
 ################################################################################
 # /book -> GET/POST -> creates a new book and when created, takes you back to
 # /books (or /book/<parent_id> -- if you added a sub-book of parent_id
@@ -576,20 +599,10 @@ def new_book():
     book_genres = []
 
     bals=[]
-    auth_cnt=1
-    processed_bal=[]
     message=""
 
     if request.method == 'POST':
-        # handle author info for new book
-        for el in request.form:
-            if 'author-' in el:
-                if not request.form[el] in processed_bal:
-                    bals.append( Book_Author_Link( author_id=request.form[el], author_num=auth_cnt ) )
-                    processed_bal.append( request.form[el] )
-                    auth_cnt+=1
-                else:
-                    message="Removed duplicate author!!!"
+        bals, message = RemoveDuplicateAuthorInForm( request )
 
         # handle genre info for new book
         for genre in genre_list:
@@ -666,7 +679,7 @@ def new_book():
             if len(book_genres) == 0:
                 message = f"{message}<br>book has to have a genre selected"
             if int(request.form['owned']) != int(ON_WISHLIST) and not request.form['year_published'].isnumeric():
-                message = f"{message}<br>book is not on wish list {request.form['owned']}, so needs a year_published between 1850 & 2100"
+                message = f"{message}<br>book is not on wish list, so needs a year_published between 1850 & 2100"
 
             print( "ERROR: Failed to create book: {}".format(message) )
             if request.form['year_published'].isnumeric():
@@ -734,8 +747,6 @@ def book(id):
     book_form.rating.choices=[(c.id, c.name) for c in Rating.query.order_by('id')]
     page_title='Edit Book'
     CheckSeriesChange=None
-    processed_bal=[]
-    alert="success"
     message=""
 
     if request.method == 'POST':
@@ -768,17 +779,7 @@ def book(id):
                     book.genre.append( genre )
             # set book author (empty list) - cant use ORM, not sure why
             ClearAuthorsForBook( book.id )
-            # then use form data -> author-0, author-1, ... author-n) & append them back to now empty list
-            cnt=1
-            for el in request.form:
-                if 'author-' in el:
-                    if not request.form[el] in processed_bal:
-                        book.bals.append( Book_Author_Link( author_id=request.form[el], book_id=id, author_num=cnt ) )
-                        processed_bal.append( request.form[el] )
-                        cnt += 1
-                    else:
-                        alert="warning"
-                        message="removed duplicate author!!!"
+            book.bals, message = RemoveDuplicateAuthorInForm( request )
 
             # go through form, if we have removed a series, then copy data out of form to be passed into html for a pop-up
             removing_series=[]