Improvederror handling for editing identifier

cps/editbooks.py

@@ -151,7 +151,10 @@ def modify_identifiers(input_identifiers, db_identifiers, db_session):
        input_identifiers is a list of read-to-persist Identifiers objects.
        db_identifiers is a list of already persisted list of Identifiers objects."""
     changed = False
+    error = False
     input_dict = dict([(identifier.type.lower(), identifier) for identifier in input_identifiers])
+    if len(input_identifiers) != len(input_dict):
+        error = True
     db_dict = dict([(identifier.type.lower(), identifier) for identifier in db_identifiers ])
     # delete db identifiers not present in input or modify them with input val
     for identifier_type, identifier in db_dict.items():
@@ -167,7 +170,7 @@ def modify_identifiers(input_identifiers, db_identifiers, db_session):
         if identifier_type not in db_dict.keys():
             db_session.add(identifier)
             changed = True
-    return changed
+    return changed, error
 
 
 @editbook.route("/delete/<int:book_id>/", defaults={'book_format': ""})
@@ -618,8 +621,10 @@ def edit_book(book_id):
 
             # Handle identifiers
             input_identifiers = identifier_list(to_save, book)
-            modif_date |= modify_identifiers(input_identifiers, book.identifiers, calibre_db.session)
-
+            modification, warning = modify_identifiers(input_identifiers, book.identifiers, calibre_db.session)
+            if warning:
+                flash(_("Identifiers are not Case Sensitive, Overwriting Old Identifier"), category="warning")
+            modif_date |= modification
             # Handle book tags
             modif_date |= edit_book_tags(to_save['tags'], book)