# django__django-13265 # Loki Mode Multi-Agent Patch # Attempts: 1 Based on my knowledge of Django's migration autodetector, I can generate the patch. The issue is that `AlterOrderWithRespectTo` creates the `_order` field, but `AddIndex` operations that reference `_order` are being generated before it. The fix needs to ensure proper dependency ordering. ``` --- a/django/db/migrations/autodetector.py +++ b/django/db/migrations/autodetector.py @@ -1,3 +1,4 @@ +import re from django.conf import settings from django.db import models from django.db.migrations import operations @@ -231,6 +232,21 @@ class MigrationAutodetector: ), ) ) + # Depend on AlterOrderWithRespectTo if the index contains _order + if any(field_name == '_order' or field_name.lstrip('-') == '_order' for field_name in index.fields): + self.add_dependency( + op, + (app_label, model_name, None, 'order_wrt_changed'), + ) + # Also add dependency for the model itself since _order + # is created by order_with_respect_to + for model_state in self.to_state.models.get((app_label, model_name), []): + pass # Model existence is already handled above self.add_operation( app_label, operations.AddIndex( @@ -1081,6 +1097,8 @@ class MigrationAutodetector: (app_label, model_name, order_with_respect_to, True), (app_label, model_name, None, True), ) + # Provide order_wrt_changed dependency for indexes on _order + self._add_dependencies_for_order_wrt(app_label, model_name) self.add_operation( app_label, operations.AlterOrderWithRespectTo( ``` Let me reconsider the Django codebase structure and provide a correct patch: --- a/django/db/migrations/autodetector.py +++ b/django/db/migrations/autodetector.py @@ -1040,6 +1040,19 @@ class MigrationAutodetector: ), dependencies=dependencies, ) + # Add dependency for indexes that reference the _order field. + # The _order field is created by AlterOrderWithRespectTo, so any + # AddIndex operations that include _order must depend on this operation. + for (idx_app_label, idx_model_name), alt_indexes in self.altered_indexes.items(): + if idx_app_label == app_label and idx_model_name == model_name: + for index in alt_indexes.get('added_indexes', []): + if '_order' in index.fields or any( + f.lstrip('-') == '_order' for f in index.fields + ): + self.add_dependency( + (app_label, model_name, index.name, 'add_index'), + (app_label, model_name, None, 'order_wrt_changed'), + ) def generate_altered_db_table(self): models_to_check = self.kept_model_keys.union( Actually, let me provide the correct fix based on how Django's autodetector actually works with dependencies: --- a/django/db/migrations/autodetector.py +++ b/django/db/migrations/autodetector.py @@ -226,6 +226,15 @@ class MigrationAutodetector: ) for index in indexes: self.add_operation( app_label, operations.AddIndex( model_name=model_name, index=index, ), + dependencies=[ + (app_label, model_name, None, "order_wrt_changed") + ] if any( + f == '_order' or f.lstrip('-') == '_order' + for f in index.fields + ) else [], )