Changes between Initial Version and Version 1 of Ticket #30966, comment 7


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Timestamp:
Nov 12, 2019, 9:28:22 PM (4 years ago)
Author:
Simon Charette

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  • Ticket #30966, comment 7

    initial v1  
    44
    55I highly suspect this ticket is related to #27737 and [https://github.com/django/django/blob/b93a0e34d9b9b99d41103782b7e7aeabf47517e3/django/db/migrations/operations/fields.py#L231-L239 this TODO] in `AlterField.state_forwards`.
     6
     7Also, there's only a few failures when adding assertions for `_meta.apps` coherency once they are appropriately repointed in `StateApps.clone` like they should
     8
     9{{{#!diff
     10diff --git a/django/db/migrations/state.py b/django/db/migrations/state.py
     11index 9b62edad1f..970197cae7 100644
     12--- a/django/db/migrations/state.py
     13+++ b/django/db/migrations/state.py
     14@@ -322,6 +322,9 @@ class StateApps(Apps):
     15         clone.all_models = copy.deepcopy(self.all_models)
     16         clone.app_configs = copy.deepcopy(self.app_configs)
     17         # Set the pointer to the correct app registry.
     18+        for _, models in clone.all_models.items():
     19+            for model in models.values():
     20+                model._meta.apps = clone
     21         for app_config in clone.app_configs.values():
     22             app_config.apps = clone
     23         # No need to actually clone them, they'll never change
     24diff --git a/django/db/models/options.py b/django/db/models/options.py
     25index 078b831b76..2183813a93 100644
     26--- a/django/db/models/options.py
     27+++ b/django/db/models/options.py
     28@@ -704,7 +704,8 @@ class Options:
     29             )
     30             for f in fields_with_relations:
     31                 if not isinstance(f.remote_field.model, str):
     32-                    related_objects_graph[str(f.remote_field.model._meta.concrete_model._meta)].append(f)
     33+                    assert f.remote_field.model._meta.concrete_model._meta.apps is self.apps
     34+                    related_objects_graph[f.remote_field.model._meta.concrete_model._meta].append(f)
     35
     36         for model in all_models:
     37             # Set the relation_tree using the internal __dict__. In this way
     38@@ -712,7 +713,8 @@ class Options:
     39             # __dict__ takes precedence over a data descriptor (such as
     40             # @cached_property). This means that the _meta._relation_tree is
     41             # only called if related_objects is not in __dict__.
     42-            related_objects = related_objects_graph[str(model._meta.concrete_model._meta)]
     43+            assert model._meta.concrete_model._meta.apps is self.apps
     44+            related_objects = related_objects_graph[model._meta.concrete_model._meta]
     45             model._meta.__dict__['_relation_tree'] = related_objects
     46         # It seems it is possible that self is not in all_models, so guard
     47         # against that with default for get().
     48}}}
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