- Introduction of Partner Admin role in combination with 'Management Partner' type.

eveai_app/errors.py

@@ -1,5 +1,7 @@
+import traceback
+
 import jinja2
-from flask import render_template, request, jsonify, redirect, current_app
+from flask import render_template, request, jsonify, redirect, current_app, flash
 from flask_login import current_user
 from common.utils.nginx_utils import prefixed_url_for
 
@@ -41,12 +43,46 @@ def key_error_handler(error):
     return render_template('error/generic.html', error_message="An unexpected error occurred"), 500
 
 
+def attribute_error_handler(error):
+    """Handle AttributeError exceptions.
+
+            Specifically catches SQLAlchemy relationship errors when string IDs
+            are used instead of model instances.
+            """
+    error_msg = str(error)
+    current_app.logger.error(f"AttributeError: {error_msg}")
+    current_app.logger.error(traceback.format_exc())
+
+    # Handle the SQLAlchemy relationship error specifically
+    if "'str' object has no attribute '_sa_instance_state'" in error_msg:
+        flash('Database relationship error. Please check your form inputs and try again.', 'error')
+        return render_template('errors/500.html',
+                               error_type="Relationship Error",
+                               error_details="A string value was provided where a database object was expected."), 500
+
+    # Handle other AttributeErrors
+    flash('An application error occurred. The technical team has been notified.', 'error')
+    return render_template('errors/500.html',
+                           error_type="Attribute Error",
+                           error_details=error_msg), 500
+
+
+def general_exception(e):
+    current_app.logger.error(f"Unhandled Exception: {e}", exc_info=True)
+    flash('An application error occurred. The technical team has been notified.', 'error')
+    return render_template('errors/500.html',
+                           error_type=type(e).__name__,
+                           error_details=str(e)), 500
+
+
 def register_error_handlers(app):
     app.register_error_handler(404, not_found_error)
     app.register_error_handler(500, internal_server_error)
     app.register_error_handler(401, not_authorised_error)
     app.register_error_handler(403, not_authorised_error)
     app.register_error_handler(KeyError, key_error_handler)
+    app.register_error_handler(AttributeError, attribute_error_handler)
+    app.register_error_handler(Exception, general_exception)
 
     @app.errorhandler(jinja2.TemplateNotFound)
     def template_not_found(error):