Can you please explain why [Django Admin @staticmethod] is happening?

Question

Django

There are three models:

models.py

####################################
class CommonInfo(models.Model):
    name = models.CharField(max_length=100,
                            unique=True,
                            null=True,
                            verbose_name='Имя')
    def __str__(self):
        return self.name

    class Meta:
        abstract = True
####################################
class FacultyModel(CommonInfo):
    pass

    class Meta(CommonInfo.Meta):
        verbose_name_plural = 'Факультеты'
        verbose_name = 'Факультет'
        ordering = ('created_at',)
####################################
class DepartmentModel(CommonInfo):
    faculty = models.ForeignKey(FacultyModel,
                                verbose_name='Факультет')
    class Meta(CommonInfo.Meta):
        verbose_name_plural = 'Кафедры'
        verbose_name = 'Кафедра'
        ordering = ('faculty', 'created_at')
####################################
class GroupModel(CommonInfo):
    department = models.ForeignKey(DepartmentModel, 
                                   verbose_name='Кафедра')

    class Meta(CommonInfo.Meta):
        verbose_name_plural = 'Группы'
        verbose_name = 'Группа'
        ordering = ('department', 'created_at',)
####################################

And there is this code in the admin panel:

admin.py

@admin.register(GroupModel)
class GroupAdmin(CommonAdmin):
    list_display = ('name', 'department', 'get_faculty_name')

    def get_faculty_name(self, obj):
        return obj.department.faculty.name

    get_faculty_name.short_description = 'Факультет'
    get_faculty_name.admin_order_field = 'faculty__name'

The result of admin.py

As you can see, a field with a faculty has been added

Things are good. Everything fits. But here PyCharm suggests this thing:
Method 'get_faculty_name' may be 'static' less... (Ctrl+F1 Alt+T)
This inspection detects any methods which may safely be made static.
I make the method static:

admin.py

@admin.register(GroupModel)
class GroupAdmin(CommonAdmin):
    list_display = ('name', 'department', 'get_faculty_name')

    @staticmethod
    def get_faculty_name(obj):
        return obj.department.faculty.name

    get_faculty_name.short_description = 'Факультет'
    get_faculty_name.admin_order_field = 'faculty__name'

And it turns out this:

Such

Sobsno the question itself is this. Is it necessary to use this static method in this situation? If so, how can I return the name of the field? I understand that if a static method is used, then it picks up the name from the name of the method.

Answer 1

I won’t tell you the implementation details in django admin either, but why pycharm gives such a hint is very easy to understand - you don’t use self in your method, which means it suggests itself to make the method static.

Answer 2

@admin.register(GroupModel)
class GroupAdmin(CommonAdmin):
    list_display = ('name', 'department', 'department__faculty')

Maybe it will be easier?
In general, it's better not to listen to pycharm and look at the django documentation.