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from django.shortcuts import render, redirect, reverse, get_object_or_404 from django.contrib import messages from django.contrib.auth.decorators import login_required from django.db.models import Q from django.db.models.functions import Lower from .models import Product, Category from .forms import ProductForm def all_products(request): """ A view to show all products, including sorting and search queries """ products = Product.objects.all() query = None categories = None sort = None direction = None if request.GET: if 'sort' in request.GET: sortkey = request.GET['sort'] sort = sortkey if sortkey == 'name': sortkey = 'lower_name' products = products.annotate(lower_name=Lower('name')) if sortkey == 'category': sortkey = 'category_name' if 'direction' in request.GET: direction = request.GET['direction'] if direction == 'desc': sortkey = f'-{sortkey}' products = products.order_by(sortkey) if 'category' in request.GET: categories = request.GET['category'].split(',') products = products.filter(category__name__in=categories) # change the list of categories into objects categories = Category.objects.filter(name__in=categories) if 'q' in request.GET: query = request.GET['q'] if not query: messages.error(request, "You didn't enter any\ search criteria!") return redirect(reverse('products')) queries = Q(name__icontains=query) | Q( description__icontains=query) products = products.filter(queries) current_sorting = f'{sort}_{direction}' context = { 'products': products, 'search_term': query, 'current_categories': categories, 'current_sorting': current_sorting, } return render(request, 'products/products.html', context) def product_detail(request, product_id): """ A view to show individual product details """ product = get_object_or_404(Product, pk=product_id) context = { 'product': product, } return render(request, 'products/product_detail.html', context) # CRUD functionality for a product management @login_required def add_product(request): """ Add a product to the store """ # defensive programming: admin has to be logged in if not request.user.is_superuser: messages.error(request, 'Sorry, only admin can enter.') return redirect(reverse('home')) if request.method == 'POST': form = ProductForm(request.POST, request.FILES) if form.is_valid(): product = form.save() messages.success(request, 'Successfully added product!') return redirect(reverse('product_detail', args=[product.id])) else: messages.error(request, 'Failed to add a product. \ Please ensure the form is valid.') else: form = ProductForm() template = 'products/add_product.html' context = { 'form': form, } return render(request, template, context) @login_required def edit_product(request, product_id): """ Edit a product in the store """ # defensive programming: admin has to be logged in if not request.user.is_superuser: messages.error(request, 'Sorry, only admin can enter.') return redirect(reverse('home')) product = get_object_or_404(Product, pk=product_id) if request.method == 'POST': form = ProductForm(request.POST, request.FILES, instance=product) if form.is_valid(): form.save() messages.success(request, 'Successfully updated product!') return redirect(reverse('product_detail', args=[product.id])) else: messages.error(request, 'Failed to update the product. \ Please ensure the form is valid.') else: form = ProductForm(instance=product) messages.info(request, f'You are editing the\ product named {product.name}') template = 'products/edit_product.html' context = { 'form': form, 'product': product, } return render(request, template, context) @login_required def delete_product(request, product_id): """ Delete a product from the store """ # defensive programming: admin has to be logged in if not request.user.is_superuser: messages.error(request, 'Sorry, only admin can enter.') return redirect(reverse('home')) product = get_object_or_404(Product, pk=product_id) product.delete() messages.success(request, 'Product has been deleted.') return redirect(reverse('products'))