music_collection/mysite/admin.py

# admin.py
from django.contrib import admin
from django.db.models import Avg, Count
from .models import Musician, Genre, Album, Song, Meloman, Rating, Preference

# Сначала зарегистрируйте модели, используемые в autocomplete_fields
@admin.register(Genre)
class GenreAdmin(admin.ModelAdmin):
    list_display = ('genre_name',)
    search_fields = ('genre_name',)  # Важно для autocomplete!
    
@admin.register(Album)
class AlbumAdmin(admin.ModelAdmin):
    list_display = ('album_name', 'musician')
    search_fields = ('album_name', 'musician__name')  # Важно для autocomplete!
    list_select_related = ('musician',)
    
@admin.register(Musician)
class MusicianAdmin(admin.ModelAdmin):
    list_display = ('name', 'city', 'birth_year')
    search_fields = ('name', 'city')

@admin.register(Song)
class SongAdmin(admin.ModelAdmin):
    list_display = ('title', 'album', 'genre', 'duration_formatted', 'avg_rating')
    list_filter = ('genre', 'album__musician')
    search_fields = ('title',)
    autocomplete_fields = ['album', 'genre']  # Теперь работает, т.к. админы зарегистрированы
    
    def get_queryset(self, request):
        return super().get_queryset(request).annotate(
            avg_rating_value=Avg('rating__score')
        )
    
    def avg_rating(self, obj):
        if hasattr(obj, 'avg_rating_value') and obj.avg_rating_value:
            return f"{obj.avg_rating_value:.1f} ★"
        return "Нет оценок"
    avg_rating.short_description = "Средний рейтинг"
    
    def duration_formatted(self, obj):
        return obj.duration_formatted if obj.duration_sec else "00:00"
    duration_formatted.short_description = "Длительность"

@admin.register(Meloman)
class MelomanAdmin(admin.ModelAdmin):
    list_display = ('full_name', 'gender', 'city', 'age')
    search_fields = ('full_name', 'city')
    list_filter = ('gender', 'city')
    
    def age(self, obj):
        return obj.age if obj.age else "—"
    age.short_description = "Возраст"

@admin.register(Rating)
class RatingAdmin(admin.ModelAdmin):
    list_display = ('song', 'meloman', 'score', 'rating_date')
    list_filter = ('score', 'rating_date')
    search_fields = ('song__title', 'meloman__full_name')
    autocomplete_fields = ['song', 'meloman']
    list_select_related = ('song', 'meloman')

@admin.register(Preference)
class PreferenceAdmin(admin.ModelAdmin):
    list_display = ('meloman', 'genre')
    list_filter = ('genre',)
    search_fields = ('meloman__full_name', 'genre__genre_name')
    autocomplete_fields = ['meloman', 'genre']