Ultron/people/admin.py

from django.contrib import admin
from .models import Gymnast


class GymnastAdmin(admin.ModelAdmin):
    model = Gymnast

    fields = (
        'last_name',
        'first_name',
        'birthdate',
        'gender',
        'trainings_by_week',
        'hours_by_week',
        'is_active',
        # "club"
    )

    list_display = ('last_name', 'first_name', 'age', 'is_active')  # , "club"
    list_filter = ('gender', 'is_active')   # , "club"
    search_fields = ('last_name', 'first_name')
    # autocomplete_fields = ("club",)

admin.site.register(Gymnast, GymnastAdmin)