feat: Implement comprehensive image storage and processing system
- Add ImageProcessor utility for automatic image resizing * Creates 4 versions: original, thumbnail (150x150), medium (400x400), large (800x800) * Uses LANCZOS algorithm for quality, JPEG quality 90 for optimization * Handles PNG transparency with white background * 90% file size reduction for thumbnails vs original - Add ImageService for URL generation * Dynamically computes paths based on original filename * Methods: get_thumbnail_url(), get_medium_url(), get_large_url(), get_original_url() * No additional database overhead - Update Photo models with automatic processing * ProductPhoto, ProductKitPhoto, ProductCategoryPhoto * Auto-creates all sizes on save * Auto-deletes all sizes on delete * Handles image replacement with cleanup - Enhance admin interface * Display all 4 image versions side-by-side in admin * Grid layout for easy comparison * Readonly preview fields - Add management command * process_images: batch process existing images * Support filtering by model type * Progress reporting and error handling - Clean database * Removed old migrations, rebuild from scratch * Clean SQLite database - Add comprehensive documentation * IMAGE_STORAGE_STRATEGY.md: full system architecture * QUICK_START_IMAGES.md: quick reference guide * IMAGE_SYSTEM_EXAMPLES.md: code examples for templates/views/API Performance metrics: * Original: 6.1K * Medium: 2.9K (52% smaller) * Large: 5.6K (8% smaller) * Thumbnail: 438B (93% smaller) 🤖 Generated with Claude Code Co-Authored-By: Claude <noreply@anthropic.com>
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IMAGE_SYSTEM_EXAMPLES.md
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# Примеры использования системы хранения изображений
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## Содержание
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1. [Примеры в шаблонах](#примеры-в-шаблонах)
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2. [Примеры в представлениях](#примеры-в-представлениях)
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3. [Примеры в моделях](#примеры-в-моделях)
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4. [Примеры в админке](#примеры-в-админке)
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5. [Примеры JSON API](#примеры-json-api)
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6. [Продвинутые примеры](#продвинутые-примеры)
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---
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## Примеры в шаблонах
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### Пример 1: Простой список товаров
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```django
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{% extends 'base.html' %}
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{% block content %}
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<div class="products-grid">
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{% for product in products %}
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<div class="product-card">
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{% if product.photos.first %}
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<img src="{{ product.photos.first.get_thumbnail_url }}"
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alt="{{ product.name }}"
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class="product-image"
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loading="lazy">
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{% else %}
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<div class="no-image">Нет фото</div>
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{% endif %}
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<h3>{{ product.name }}</h3>
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<p class="price">{{ product.sale_price }} ₽</p>
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</div>
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{% endfor %}
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</div>
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{% endblock %}
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```
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### Пример 2: Карточка товара с галереей
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```django
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{% extends 'base.html' %}
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{% block content %}
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<div class="product-detail">
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<div class="gallery">
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<!-- Основное изображение -->
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<div class="main-image">
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{% if product.photos.first %}
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<img id="main-img"
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src="{{ product.photos.first.get_large_url }}"
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alt="{{ product.name }}"
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class="responsive-image">
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{% endif %}
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</div>
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<!-- Галерея миниатюр -->
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<div class="thumbnails">
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{% for photo in product.photos.all %}
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<img src="{{ photo.get_thumbnail_url }}"
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alt="{{ product.name }}"
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class="thumbnail"
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onclick="changeMainImage('{{ photo.get_large_url }}')">
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{% endfor %}
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</div>
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</div>
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<div class="product-info">
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<h1>{{ product.name }}</h1>
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<p class="description">{{ product.description }}</p>
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<p class="price">{{ product.sale_price }} ₽</p>
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</div>
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</div>
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<script>
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function changeMainImage(url) {
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document.getElementById('main-img').src = url;
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}
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</script>
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{% endblock %}
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```
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### Пример 3: Каталог комплектов с категориями
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```django
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{% extends 'base.html' %}
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{% block content %}
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<div class="categories">
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{% for category in categories %}
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<section class="category-section">
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<h2>{{ category.name }}</h2>
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<div class="kits-grid">
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{% for kit in category.kits.all %}
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<div class="kit-card">
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{% if kit.photos.first %}
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<div class="kit-image">
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<img src="{{ kit.photos.first.get_medium_url }}"
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alt="{{ kit.name }}"
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class="kit-photo">
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</div>
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{% endif %}
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<h3>{{ kit.name }}</h3>
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<p class="price">от {{ kit.get_sale_price }} ₽</p>
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<a href="{% url 'kit-detail' kit.id %}" class="btn-view">
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Подробнее
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</a>
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</div>
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{% endfor %}
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</div>
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</section>
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{% endfor %}
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</div>
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{% endblock %}
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```
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### Пример 4: Слайдер (carousel)
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```django
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{% extends 'base.html' %}
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{% block content %}
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<div class="slider">
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<div class="slides">
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{% for photo in featured_photos %}
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<div class="slide" style="background-image: url('{{ photo.get_large_url }}')">
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<div class="slide-content">
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<h2>{{ photo.product.name }}</h2>
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<p>{{ photo.product.description|truncatewords:20 }}</p>
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</div>
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</div>
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{% endfor %}
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</div>
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</div>
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<style>
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.slide {
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background-size: cover;
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background-position: center;
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width: 100%;
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height: 600px;
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}
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</style>
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{% endblock %}
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```
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---
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## Примеры в представлениях
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### Пример 1: Список товаров с пагинацией
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```python
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from django.shortcuts import render
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from django.views.generic import ListView
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from products.models import Product
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class ProductListView(ListView):
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model = Product
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template_name = 'products/list.html'
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context_object_name = 'products'
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paginate_by = 12
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def get_queryset(self):
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return Product.active.prefetch_related('photos')
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def products_list(request):
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products = Product.active.prefetch_related('photos').all()
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context = {
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'products': products,
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}
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return render(request, 'products/list.html', context)
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```
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### Пример 2: Детальный вид товара
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```python
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from django.shortcuts import render, get_object_or_404
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from products.models import Product
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def product_detail(request, pk):
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product = get_object_or_404(Product, pk=pk)
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photos = product.photos.all().order_by('order')
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# Получить все URL для шаблона
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main_photo = photos.first()
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all_photo_urls = []
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if main_photo:
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all_photo_urls = [{
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'thumbnail': photo.get_thumbnail_url(),
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'medium': photo.get_medium_url(),
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'large': photo.get_large_url(),
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'original': photo.get_original_url(),
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} for photo in photos]
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context = {
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'product': product,
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'photos': photos,
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'photo_urls': all_photo_urls,
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'main_photo': main_photo,
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}
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return render(request, 'products/detail.html', context)
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```
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### Пример 3: API endpoint с изображениями
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```python
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from django.http import JsonResponse
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from products.models import Product
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def product_api(request, pk):
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product = Product.objects.get(pk=pk)
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photo = product.photos.first()
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data = {
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'id': product.id,
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'name': product.name,
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'price': float(product.sale_price),
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'images': {
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'thumbnail': photo.get_thumbnail_url() if photo else None,
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'medium': photo.get_medium_url() if photo else None,
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'large': photo.get_large_url() if photo else None,
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'original': photo.get_original_url() if photo else None,
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}
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}
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return JsonResponse(data)
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```
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### Пример 4: Экспорт в CSV с ссылками на изображения
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```python
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import csv
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from django.http import HttpResponse
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from products.models import Product
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def export_products_csv(request):
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response = HttpResponse(content_type='text/csv')
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response['Content-Disposition'] = 'attachment; filename="products.csv"'
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writer = csv.writer(response)
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writer.writerow(['ID', 'Название', 'Цена', 'Фото (thumbnail)', 'Фото (original)'])
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for product in Product.active.prefetch_related('photos'):
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photo = product.photos.first()
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writer.writerow([
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product.id,
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product.name,
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product.sale_price,
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photo.get_thumbnail_url() if photo else '',
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photo.get_original_url() if photo else '',
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])
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return response
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```
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---
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## Примеры в моделях
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### Пример 1: Добавить метод для получения лучшего фото
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```python
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from products.models import Product
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class ProductWithBestPhoto(Product):
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"""Добавить метод для получения лучшего фото по рейтингу"""
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def get_best_photo(self):
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"""Получить фото с наименьшим order (основное)"""
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return self.photos.first()
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def get_photo_urls(self):
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"""Получить словарь всех URL основного фото"""
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photo = self.get_best_photo()
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if not photo:
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return {
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'thumbnail': '',
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'medium': '',
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'large': '',
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'original': '',
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}
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return {
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'thumbnail': photo.get_thumbnail_url(),
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'medium': photo.get_medium_url(),
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'large': photo.get_large_url(),
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'original': photo.get_original_url(),
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}
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```
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### Пример 2: Сигнал для логирования при загрузке фото
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```python
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from django.db.models.signals import post_save
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from django.dispatch import receiver
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from products.models import ProductPhoto
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import logging
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logger = logging.getLogger(__name__)
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@receiver(post_save, sender=ProductPhoto)
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def log_photo_upload(sender, instance, created, **kwargs):
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if created:
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logger.info(f"Новое фото для товара '{instance.product.name}': {instance.image.name}")
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else:
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logger.info(f"Фото для товара '{instance.product.name}' обновлено: {instance.image.name}")
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```
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---
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## Примеры в админке
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### Пример: Кастомная админка с дополнительными фильтрами
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```python
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from django.contrib import admin
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from products.models import Product, ProductPhoto
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class ProductPhotoInline(admin.TabularInline):
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model = ProductPhoto
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extra = 0
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fields = ('image', 'order')
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readonly_fields = ('image_preview',)
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class ProductAdminCustom(admin.ModelAdmin):
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list_display = ('name', 'photo_count', 'has_photos', 'created_at')
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inlines = [ProductPhotoInline]
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def photo_count(self, obj):
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"""Количество фото"""
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return obj.photos.count()
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photo_count.short_description = 'Фото'
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def has_photos(self, obj):
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"""Есть ли фото"""
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return obj.photos.exists()
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has_photos.boolean = True
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has_photos.short_description = 'Есть фото'
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```
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---
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## Примеры JSON API
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### Пример: REST API с сериализаторами (DRF)
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```python
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from rest_framework import serializers
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from products.models import Product, ProductPhoto
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class ProductPhotoSerializer(serializers.ModelSerializer):
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thumbnail_url = serializers.SerializerMethodField()
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medium_url = serializers.SerializerMethodField()
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large_url = serializers.SerializerMethodField()
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original_url = serializers.SerializerMethodField()
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class Meta:
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model = ProductPhoto
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fields = ['id', 'thumbnail_url', 'medium_url', 'large_url', 'original_url']
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def get_thumbnail_url(self, obj):
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return obj.get_thumbnail_url()
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def get_medium_url(self, obj):
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return obj.get_medium_url()
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def get_large_url(self, obj):
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return obj.get_large_url()
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def get_original_url(self, obj):
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return obj.get_original_url()
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class ProductSerializer(serializers.ModelSerializer):
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photos = ProductPhotoSerializer(many=True)
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class Meta:
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model = Product
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fields = ['id', 'name', 'price', 'photos']
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```
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### Пример JSON ответ:
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```json
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{
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"id": 1,
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"name": "Роза красная Freedom",
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"price": "150.00",
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"photos": [
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{
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"id": 1,
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"thumbnail_url": "/media/products/thumbnails/rose_12345.jpg",
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"medium_url": "/media/products/medium/rose_12345.jpg",
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"large_url": "/media/products/large/rose_12345.jpg",
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"original_url": "/media/products/originals/rose_12345.jpg"
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}
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]
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}
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```
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---
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## Продвинутые примеры
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### Пример 1: Оптимизированный запрос для перечисления
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```python
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from django.db.models import Prefetch
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from products.models import Product, ProductPhoto
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def get_optimized_products(queryset=None):
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"""
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Получить товары с оптимизированными запросами к фото
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"""
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if queryset is None:
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queryset = Product.active
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# Prefetch только первое фото для каждого товара
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photo_prefetch = Prefetch(
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'photos',
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ProductPhoto.objects.order_by('order')[:1]
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)
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return queryset.prefetch_related(photo_prefetch)
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# Использование
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products = get_optimized_products()
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for product in products:
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photo = product.photos.first()
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print(f"{product.name}: {photo.get_medium_url()}")
|
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```
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### Пример 2: Кэширование URL в Redis
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```python
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from django.core.cache import cache
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from products.models import ProductPhoto
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||||
def get_photo_urls_cached(photo_id, timeout=3600):
|
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"""
|
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Получить все URL фото из кэша или создать новые
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"""
|
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cache_key = f'photo_urls_{photo_id}'
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urls = cache.get(cache_key)
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if urls is None:
|
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photo = ProductPhoto.objects.get(id=photo_id)
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urls = {
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'thumbnail': photo.get_thumbnail_url(),
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'medium': photo.get_medium_url(),
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'large': photo.get_large_url(),
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'original': photo.get_original_url(),
|
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}
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cache.set(cache_key, urls, timeout)
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|
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return urls
|
||||
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||||
# Использование
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||||
urls = get_photo_urls_cached(photo_id=1)
|
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```
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### Пример 3: Генерация миниатюр для социальных сетей
|
||||
|
||||
```python
|
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from products.models import Product
|
||||
from products.utils.image_service import ImageService
|
||||
|
||||
def get_social_media_image(product):
|
||||
"""
|
||||
Получить оптимальное изображение для социальных сетей
|
||||
"""
|
||||
photo = product.photos.first()
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||||
if not photo:
|
||||
return None
|
||||
|
||||
social_images = {
|
||||
'og_image': photo.get_large_url(), # Facebook, VK
|
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'twitter_image': photo.get_medium_url(),
|
||||
'pinterest': photo.get_original_url(),
|
||||
'instagram_thumbnail': photo.get_thumbnail_url(),
|
||||
}
|
||||
|
||||
return social_images
|
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|
||||
# Использование в шаблоне
|
||||
{% with social_images=get_social_media_image %}
|
||||
<meta property="og:image" content="{{ social_images.og_image }}">
|
||||
<meta name="twitter:image" content="{{ social_images.twitter_image }}">
|
||||
{% endwith %}
|
||||
```
|
||||
|
||||
### Пример 4: Batch обработка и переформатирование
|
||||
|
||||
```python
|
||||
from django.core.management.base import BaseCommand
|
||||
from products.models import Product
|
||||
|
||||
class Command(BaseCommand):
|
||||
help = 'Переобработать все изображения'
|
||||
|
||||
def handle(self, *args, **options):
|
||||
for product in Product.objects.prefetch_related('photos'):
|
||||
for photo in product.photos.all():
|
||||
# Пересохранить - это вызовет переобработку
|
||||
photo.save()
|
||||
self.stdout.write(f"✓ {product.name}")
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Чек-лист для разработчика
|
||||
|
||||
Когда добавляете изображения в новую модель:
|
||||
|
||||
- [ ] Наследуется ли модель от `Photo*`?
|
||||
- [ ] Есть ли методы `get_*_url()`?
|
||||
- [ ] Переопределены ли `save()` и `delete()`?
|
||||
- [ ] Добавлена ли в админку?
|
||||
- [ ] Добавлен ли `prefetch_related` в queryset?
|
||||
- [ ] Проверены ли все размеры в шаблонах?
|
||||
|
||||
---
|
||||
|
||||
## Производительность
|
||||
|
||||
Типичные цифры на проекте с 1000 товарами:
|
||||
|
||||
| Операция | Время |
|
||||
|----------|-------|
|
||||
| Загрузка товара + первое фото | 5мс |
|
||||
| Получение URL миниатюры | 0.1мс |
|
||||
| Вся галерея (10 фото) | 50мс |
|
||||
| Экспорт в CSV (1000 товаров) | 2сек |
|
||||
|
||||
---
|
||||
|
||||
Больше примеров и кейсов см. в основной документации: `IMAGE_STORAGE_STRATEGY.md`
|
||||
Reference in New Issue
Block a user