#35393: InlineAdmin's are not possible with an editable UUIDField as primary key. -------------------------------------+------------------------------------- Reporter: Willem Van Onsem | Owner: Willem | Van Onsem Type: Bug | Status: assigned Component: contrib.admin | Version: 5.0 Severity: Normal | Resolution: Keywords: | Triage Stage: Accepted Has patch: 1 | Needs documentation: 0 Needs tests: 1 | Patch needs improvement: 0 Easy pickings: 0 | UI/UX: 0 -------------------------------------+------------------------------------- Changes (by Sarah Boyce):
* needs_tests: 0 => 1 * owner: nobody => Willem Van Onsem * stage: Unreviewed => Accepted * status: new => assigned * summary: InlineAdmin's are *not* possible with an *editable* UUIDField as primary key. => InlineAdmin's are not possible with an editable UUIDField as primary key. Old description: > This issue was reported on [https://stackoverflow.com/a/78362210/67579 > StackOverflow]: if we have a model with an **editable** primary key that > is **not** an `AutoField`, the editing of inlines fails. > > This is because then the hidden field to "backlink" to the original item > fails: there is no `<input type="hidden" id="id_child_set-0-id" > name="child_set-0-id"> in the formsets, so no instances are attached to > the forms of the formset. At best this would thus create new instances, > at worst, it will in case of the UUID just fail to edit the inline > objects and thus reject the entire form(set) and therefore reject the > edit of the object in general. > > The steps to reproduce these are using models: > > {{{ > class Parent(models.Model): > name = models.CharField(max_length=128) > > class Child(models.Model): > id = models.UUIDField(primary_key=True, default=uuid.uuid4) > name = models.CharField(max_length=128) > }}} > > and then work with an admin: > > {{{ > class ChildInline(admin.TabularInline): > model = Child > exclude = ("id",) # important > extra = 1 > verbose_name = "Subexample" > show_change_link = True > > @admin.register(Parent) > class ParentAdmin(admin.ModelAdmin): > search_fields = ("name", ) > inlines = [ChildInline,] > }}} > > An easy workaround is to mark the `id` field of the `Child` as > `editable=False`, which will resolve the issue. But it is not said that > the UUID should *never* be editable, it is for example possible to > exclude that for the inline, but then use it for another `ModelAdmin`, > perhaps to duplicate to another UUID, or just use another primary key > field altogether. > > The fix turned out to be quite minimal: just ensure that the primary key > field is added, so in the `helpers.py`, for the `InlineAdminForm`, we > use: > > {{{ > def needs_explicit_pk_field(self): > return ( > # Auto fields are editable, so check for auto or non-editable > pk. > self.form._meta.model._meta.auto_field > or not self.form._meta.model._meta.pk.editable > or self.form._meta.model._meta.pk.name in > (self.form._meta.exclude or ()) > or > # Also search any parents for an auto field. (The pk info is > # propagated to child models so that does not need to be > checked > # in parents.) > any( > parent._meta.auto_field or not > parent._meta.model._meta.pk.editable > for parent in > self.form._meta.model._meta.get_parent_list() > ) > ) > }}} New description: This issue was reported on [https://stackoverflow.com/a/78362210/67579 StackOverflow]: if we have a model with an **editable** primary key that is **not** an `AutoField`, the editing of inlines fails. This is because then the hidden field to "backlink" to the original item fails: there is no `<input type="hidden" id="id_child_set-0-id" name="child_set-0-id"> in the formsets, so no instances are attached to the forms of the formset. At best this would thus create new instances, at worst, it will in case of the UUID just fail to edit the inline objects and thus reject the entire form(set) and therefore reject the edit of the object in general. The steps to reproduce these are using models: {{{ class Parent(models.Model): name = models.CharField(max_length=128) class Child(models.Model): id = models.UUIDField(primary_key=True, default=uuid.uuid4) name = models.CharField(max_length=128) parent = models.ForeignKey(Parent, on_delete=models.CASCADE) }}} and then work with an admin: {{{ class ChildInline(admin.TabularInline): model = Child exclude = ("id",) # important extra = 1 verbose_name = "Subexample" show_change_link = True @admin.register(Parent) class ParentAdmin(admin.ModelAdmin): search_fields = ("name", ) inlines = [ChildInline,] }}} An easy workaround is to mark the `id` field of the `Child` as `editable=False`, which will resolve the issue. But it is not said that the UUID should *never* be editable, it is for example possible to exclude that for the inline, but then use it for another `ModelAdmin`, perhaps to duplicate to another UUID, or just use another primary key field altogether. The fix turned out to be quite minimal: just ensure that the primary key field is added, so in the `helpers.py`, for the `InlineAdminForm`, we use: {{{ def needs_explicit_pk_field(self): return ( # Auto fields are editable, so check for auto or non-editable pk. self.form._meta.model._meta.auto_field or not self.form._meta.model._meta.pk.editable or self.form._meta.model._meta.pk.name in (self.form._meta.exclude or ()) or # Also search any parents for an auto field. (The pk info is # propagated to child models so that does not need to be checked # in parents.) any( parent._meta.auto_field or not parent._meta.model._meta.pk.editable for parent in self.form._meta.model._meta.get_parent_list() ) ) }}} -- Comment: Thank you for the report Willem! Replicated on main and can see your patch resolves the issue (thank you for providing that). 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