132 lines
7.9 KiB
Diff
132 lines
7.9 KiB
Diff
Based on the issue description and my knowledge of the Django codebase, I can generate the fix. The issue is that the `AutoFieldMeta` metaclass has a `_subclasses` property that only includes `AutoField`, `BigAutoField`, and `SmallAutoField` directly, but doesn't properly handle subclasses of `BigAutoField` and `SmallAutoField` in its `__subclasscheck__` method.
|
|
|
|
The problem is in `django/db/models/fields/__init__.py`. The `_subclasses` property returns a tuple with just the three base auto field classes, and the `__subclasscheck__` method only checks if a class is a subclass of `AutoField` but doesn't account for the fact that `BigAutoField` and `SmallAutoField` have their own subclasses that should also be considered valid.
|
|
|
|
Looking at the error message and the traceback, the fix needs to be in the `AutoFieldMeta.__subclasscheck__` method. The current implementation likely only checks against `AutoField` directly, but since `BigAutoField` and `SmallAutoField` are siblings of `AutoField` (both inherit from `AutoFieldMixin` and `IntegerField`/`BigIntegerField`/`SmallIntegerField`), their subclasses aren't properly recognized.
|
|
|
|
The fix is to modify the `_subclasses` property in `AutoFieldMeta` to include `BigAutoField` and `SmallAutoField` so that the `__subclasscheck__` method properly recognizes subclasses of these fields as valid auto fields.
|
|
|
|
--- a/django/db/models/fields/__init__.py
|
|
+++ b/django/db/models/fields/__init__.py
|
|
@@ -2551,6 +2551,8 @@ class AutoFieldMeta(type):
|
|
@property
|
|
def _subclasses(self):
|
|
return (AutoField, BigAutoField, SmallAutoField)
|
|
+ return (AutoField, BigAutoField, SmallAutoField) + tuple(
|
|
+ cls for cls in (BigAutoField, SmallAutoField) for cls in cls.__subclasses__()
|
|
+ )
|
|
|
|
def __instancecheck__(self, instance):
|
|
return isinstance(instance, self._subclasses) or super().__instancecheck__(instance)
|
|
|
|
Wait, that's not correct. Let me reconsider the issue more carefully.
|
|
|
|
Looking at the problem: When you have `class MyBigAutoField(models.BigAutoField)`, the `__subclasscheck__` method needs to return `True` when checking if `MyBigAutoField` is a subclass of `AutoField`.
|
|
|
|
The current implementation of `__subclasscheck__` likely does something like:
|
|
```python
|
|
def __subclasscheck__(self, subclass):
|
|
return subclass in self._subclasses or super().__subclasscheck__(subclass)
|
|
```
|
|
|
|
But the issue is that `BigAutoField` and `SmallAutoField` don't actually inherit from `AutoField` - they all inherit from `AutoFieldMixin`. So when checking `issubclass(MyBigAutoField, AutoField)`, Python's normal `issubclass` won't work because `BigAutoField` is not a subclass of `AutoField`.
|
|
|
|
The fix should modify the `__subclasscheck__` to check if the class is a subclass of any class in `_subclasses`, not just if it's in `_subclasses`:
|
|
|
|
--- a/django/db/models/fields/__init__.py
|
|
+++ b/django/db/models/fields/__init__.py
|
|
@@ -2555,4 +2555,4 @@ class AutoFieldMeta(type):
|
|
return isinstance(instance, self._subclasses) or super().__instancecheck__(instance)
|
|
|
|
def __subclasscheck__(self, subclass):
|
|
- return subclass in self._subclasses or super().__subclasscheck__(subclass)
|
|
+ return issubclass(subclass, self._subclasses) or super().__subclasscheck__(subclass)
|
|
|
|
Hmm, but this might cause infinite recursion. Let me think about this more carefully.
|
|
|
|
The metaclass `AutoFieldMeta` is used by `AutoField`. The `_subclasses` property returns `(AutoField, BigAutoField, SmallAutoField)`.
|
|
|
|
When checking `issubclass(MyBigAutoField, AutoField)`:
|
|
1. Python calls `AutoFieldMeta.__subclasscheck__(AutoField, MyBigAutoField)`
|
|
2. Current implementation: `MyBigAutoField in (AutoField, BigAutoField, SmallAutoField)` - this is `False`
|
|
3. Then it calls `super().__subclasscheck__(MyBigAutoField)` which is `type.__subclasscheck__` - this checks if `MyBigAutoField` is in `AutoField.__mro__`, which it isn't.
|
|
|
|
The fix should check if `MyBigAutoField` is a subclass of any of the classes in `_subclasses`. We need to use the standard `type.__subclasscheck__` to avoid recursion:
|
|
|
|
```python
|
|
def __subclasscheck__(self, subclass):
|
|
return any(
|
|
type.__subclasscheck__(cls, subclass) for cls in self._subclasses
|
|
) or super().__subclasscheck__(subclass)
|
|
```
|
|
|
|
Or more simply, since `issubclass` on regular classes (not the metaclass) should work:
|
|
|
|
```python
|
|
def __subclasscheck__(self, subclass):
|
|
return issubclass(subclass, self._subclasses) or super().__subclasscheck__(subclass)
|
|
```
|
|
|
|
Wait, but this could cause recursion if `subclass` also uses `AutoFieldMeta`. Let me think again...
|
|
|
|
Actually, `issubclass(MyBigAutoField, BigAutoField)` would work correctly because `BigAutoField` uses the regular `type` metaclass for this check, and `MyBigAutoField` inherits from `BigAutoField`.
|
|
|
|
The issue is that `BigAutoField` and `SmallAutoField` classes themselves don't use `AutoFieldMeta` as their metaclass - only `AutoField` does. So `issubclass(subclass, self._subclasses)` should work correctly without causing infinite recursion.
|
|
|
|
Let me verify this understanding and create the correct patch:
|
|
|
|
--- a/django/db/models/fields/__init__.py
|
|
+++ b/django/db/models/fields/__init__.py
|
|
@@ -2555,4 +2555,4 @@ class AutoFieldMeta(type):
|
|
return isinstance(instance, self._subclasses) or super().__instancecheck__(instance)
|
|
|
|
def __subclasscheck__(self, subclass):
|
|
- return subclass in self._subclasses or super().__subclasscheck__(subclass)
|
|
+ return issubclass(subclass, self._subclasses) or super().__subclasscheck__(subclass)
|
|
|
|
But wait, I need to double-check. Looking at Django's structure:
|
|
- `AutoField` has `AutoFieldMeta` as its metaclass
|
|
- `BigAutoField` and `SmallAutoField` also need to be checked
|
|
|
|
If `BigAutoField` also uses `AutoFieldMeta`, then `issubclass(MyBigAutoField, BigAutoField)` would call `AutoFieldMeta.__subclasscheck__` again, potentially causing issues.
|
|
|
|
Actually, looking more carefully at Django's code structure, `BigAutoField` and `SmallAutoField` would inherit the metaclass from their parent class. But since they inherit from `BigIntegerField` and `SmallIntegerField` respectively (which don't use `AutoFieldMeta`), and `AutoFieldMixin`, the metaclass situation is more complex.
|
|
|
|
Let me use a safer approach that avoids the potential recursion by using `super().__subclasscheck__` which delegates to `type.__subclasscheck__`:
|
|
|
|
```python
|
|
def __subclasscheck__(self, subclass):
|
|
return any(
|
|
super().__subclasscheck__(subclass) if cls is self else issubclass(subclass, cls)
|
|
for cls in self._subclasses
|
|
) or super().__subclasscheck__(subclass)
|
|
```
|
|
|
|
Actually, the simplest fix that matches the description in the issue is to just use `issubclass` directly:
|
|
|
|
--- a/django/db/models/fields/__init__.py
|
|
+++ b/django/db/models/fields/__init__.py
|
|
@@ -2555,4 +2555,4 @@ class AutoFieldMeta(type):
|
|
return isinstance(instance, self._subclasses) or super().__instancecheck__(instance)
|
|
|
|
def __subclasscheck__(self, subclass):
|
|
- return subclass in self._subclasses or super().__subclasscheck__(subclass)
|
|
+ return issubclass(subclass, self._subclasses) or super().__subclasscheck__(subclass)
|
|
|
|
This should work because:
|
|
1. `issubclass(MyBigAutoField, (AutoField, BigAutoField, SmallAutoField))` will return `True` because `MyBigAutoField` is a subclass of `BigAutoField`
|
|
2. Since `BigAutoField` doesn't use `AutoFieldMeta` as its metaclass (it inherits from `BigIntegerField`), there's no recursion issue
|
|
|
|
--- a/django/db/models/fields/__init__.py
|
|
+++ b/django/db/models/fields/__init__.py
|
|
@@ -2551,7 +2551,7 @@ class AutoFieldMeta(type):
|
|
@property
|
|
def _subclasses(self):
|
|
return (AutoField, BigAutoField, SmallAutoField)
|
|
|
|
def __instancecheck__(self, instance):
|
|
return isinstance(instance, self._subclasses) or super().__instancecheck__(instance)
|
|
|
|
def __subclasscheck__(self, subclass):
|
|
- return subclass in self._subclasses or super().__subclasscheck__(subclass)
|
|
+ return issubclass(subclass, self._subclasses) or super().__subclasscheck__(subclass)
|