QuerySet.Delete - inconsistent result when zero objects deleted

[Adi Gabaie]

The result format of the QuerySet.Delete method is a tuple: (X, Y)
X - is the total amount of deleted objects (including foreign key deleted objects)
Y - is a dictionary specifying counters of deleted objects for each specific model (the key is the _meta.label of the model and the value is counter of deleted objects of this model).

Example: <class 'tuple'>: (2, {'my_app.FileAccess': 1, 'my_app.File': 1})

When there are zero objects to delete in total - the result is inconsistent:

• For models with foreign keys - the result will be: <class 'tuple'>: (0, {})
• For "simple" models without foreign key - the result will be: <class 'tuple'>: (0, {'my_app.BlockLibrary': 0})

I would expect there will be no difference between the two cases: Either both will have the empty dictionary OR both will have dictionary with model-label keys and zero value.

[Simon Charette]

I guess we could adapt the code not to include any key if the count is zero in the second case.

[Mariusz Felisiak <felisiak.mariusz@…>]

In 35a67b37:

Fixed #31474 -- Made QuerySet.delete() not return the number of deleted objects if it's zero.