frappe-errors-controllers

Infinite recursion in Frappe controller hooks usually happens when calling self.save() inside on_update. Use db_set for field updates and apply recursion guards via document flags to prevent the loop.

Debug Frappe autoname failures by mapping the naming hook phase to identify root causes like incorrect patterns or missing logic. Apply production-safe hook patterns to resolve the naming sequence.

Validation logic for Frappe document submission belongs in the before_submit hook phase. Placing validations directly in on_submit causes timing issues because the document state has already transitioned.

Fix Frappe permission_query_conditions SQL errors by constructing safe permission SQL with proper escaping. This prevents injection risks and resolves query failures during the get_list hook phase.

extend_doctype_class conflicts in Frappe v16 occur when controller class overrides are missing the super() call. Ensuring super() is called in overrides resolves these lifecycle logic and inheritance conflicts.

Resolve Frappe NestedSet circular references by diagnosing the controller hook phases affecting tree structure integrity. Apply production-safe hook patterns to prevent corrupt parent-child relationships during save operations.