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catalog.py
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catalog.py
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from functools import partial
from django import http
from django.conf import settings
from django.core.paginator import Paginator, InvalidPage
from django.shortcuts import render, get_object_or_404
from django.views.decorators.http import require_POST
from django_user_agents.utils import get_user_agent
from catalog.views import catalog
from images.models import Image
from pages import views as pages_views
from shopelectro import config
from shopelectro import models
from shopelectro.views.helpers import set_csrf_cookie
PRODUCTS_ON_PAGE_PC = 48
PRODUCTS_ON_PAGE_MOB = 12
def get_products_count(request):
"""Calculate max products list size from request. List size depends on device type."""
mobile_view = get_user_agent(request).is_mobile
return PRODUCTS_ON_PAGE_MOB if mobile_view else PRODUCTS_ON_PAGE_PC
def get_paginated_page_or_404(objects, per_page, page_number):
try:
return Paginator(objects, per_page).page(page_number)
except InvalidPage:
raise http.Http404('Page does not exist')
# CATALOG VIEWS
class CategoryTree(catalog.CategoryTree):
category_model = models.Category
@set_csrf_cookie
class ProductPage(catalog.ProductPage):
pk_url_kwarg = None
slug_url_kwarg = 'product_vendor_code'
slug_field = 'vendor_code'
queryset = (
models.Product.objects
.filter(category__isnull=False, page__is_active=True)
.prefetch_related('product_feedbacks', 'page__images')
.select_related('page')
)
def get(self, request, *args, **kwargs):
try:
self.object = self.get_object()
except http.Http404 as error404:
# @todo #273 Render 404, that is recommending products for a deleted product.
# 1. Find a product with page__is_active=False
# 2. If the product exists then render 404 with products of its category
# See the parent issue for details.
raise error404
context = self.get_context_data(object=self.object)
return self.render_to_response(context)
def get_context_data(self, **kwargs):
context = super(ProductPage, self).get_context_data(**kwargs)
group_tags_pairs = (
models.Tag.objects
.filter(products=self.object)
.get_group_tags_pairs()
)
return {
**context,
'price_bounds': config.PRICE_BOUNDS,
'group_tags_pairs': group_tags_pairs
}
# SHOPELECTRO-SPECIFIC VIEWS
@set_csrf_cookie
class IndexPage(pages_views.CustomPageView):
def get_context_data(self, **kwargs):
"""Extended method. Add product's images to context."""
context = super(IndexPage, self).get_context_data(**kwargs)
mobile_view = get_user_agent(self.request).is_mobile
top_products = (
models.Product.objects
.filter(id__in=settings.TOP_PRODUCTS, page__is_active=True)
.prefetch_related('category')
.select_related('page')
)
images = Image.objects.get_main_images_by_pages(
models.ProductPage.objects.filter(
shopelectro_product__in=top_products
)
)
categories = models.Category.objects.get_root_categories_by_products(
top_products)
prepared_top_products = []
if not mobile_view:
prepared_top_products = [
(product, images.get(product.page), categories.get(product))
for product in top_products
]
return {
**context,
'category_tile': config.MAIN_PAGE_TILE,
'prepared_top_products': prepared_top_products,
}
def merge_products_and_images(products):
images = Image.objects.get_main_images_by_pages(
models.ProductPage.objects.filter(shopelectro_product__in=products)
)
return [
(product, images.get(product.page))
for product in products
]
@set_csrf_cookie
class CategoryPage(catalog.CategoryPage):
def get_context_data(self, **kwargs):
"""Add sorting options and view_types in context."""
context = super().get_context_data(**kwargs)
products_on_page = int(self.request.GET.get(
'step', get_products_count(self.request),
))
page_number = int(self.request.GET.get('page', 1))
view_type = self.request.session.get('view_type', 'tile')
sorting = int(self.kwargs.get('sorting', 0))
sorting_option = config.category_sorting(sorting)
category = context['category']
if (
page_number < 1 or
products_on_page not in settings.CATEGORY_STEP_MULTIPLIERS
):
raise http.Http404('Page does not exist.')
all_products = (
models.Product.objects
.prefetch_related('page__images')
.select_related('page')
.get_by_category(category, ordering=(sorting_option, ))
)
group_tags_pairs = (
models.Tag.objects
.filter(products__in=all_products)
.get_group_tags_pairs()
)
tags = self.kwargs.get('tags')
tag_titles = ''
if tags:
slugs = models.Tag.parse_url_tags(tags)
tags = models.Tag.objects.filter(slug__in=slugs)
all_products = (
all_products
.filter(tags__in=tags)
# Use distinct because filtering by QuerySet tags,
# that related with products by many-to-many relation.
.distinct(sorting_option.lstrip('-'))
)
tag_titles = models.serialize_tags_to_title(tags)
def template_context(page, tag_titles, tags):
return {
'page': page,
'tag_titles': tag_titles,
'tags': tags,
}
page = context['page']
page.get_template_render_context = partial(
template_context, page, tag_titles, tags)
paginated_page = get_paginated_page_or_404(all_products, products_on_page, page_number)
total_products = all_products.count()
products = paginated_page.object_list
if not products:
raise http.Http404('Page without products does not exist.')
return {
**context,
'product_image_pairs': merge_products_and_images(products),
'group_tags_pairs': group_tags_pairs,
'total_products': total_products,
'products_count': (page_number - 1) * products_on_page + products.count(),
'paginated_page': paginated_page,
'sorting_options': config.category_sorting(),
'limits': settings.CATEGORY_STEP_MULTIPLIERS,
'sort': sorting,
'tags': tags,
'view_type': view_type,
'skip_canonical': bool(tags),
}
def load_more(request, category_slug, offset=0, limit=0, sorting=0, tags=None):
"""
Load more products of a given category.
:param sorting: preferred sorting index from CATEGORY_SORTING tuple
:param request: HttpRequest object
:param category_slug: Slug for a given category
:param offset: used for slicing QuerySet.
:return: products list in html format
"""
products_on_page = limit or get_products_count(request)
offset = int(offset)
if offset < 0:
return http.HttpResponseBadRequest(
'The offset is wrong. An offset should be greater than or equal to 0.'
)
if products_on_page not in settings.CATEGORY_STEP_MULTIPLIERS:
return http.HttpResponseBadRequest(
'The limit number is wrong. List of available numbers:'
f' {", ".join(map(str, settings.CATEGORY_STEP_MULTIPLIERS))}'
)
# increment page number because:
# 11 // 12 = 0, 0 // 12 = 0 but it should be the first page
# 12 // 12 = 1, 23 // 12 = 1, but it should be the second page
page_number = (offset // products_on_page) + 1
category = get_object_or_404(models.CategoryPage, slug=category_slug).model
sorting_option = config.category_sorting(int(sorting))
all_products = (
models.Product.objects
.prefetch_related('page__images')
.select_related('page')
.get_by_category(category, ordering=(sorting_option,))
)
if tags:
tag_entities = models.Tag.objects.filter(
slug__in=models.Tag.parse_url_tags(tags)
)
all_products = (
all_products
.filter(tags__in=tag_entities)
# Use distinct because filtering by QuerySet tags,
# that related with products by many-to-many relation.
.distinct(sorting_option.lstrip('-'))
)
paginated_page = get_paginated_page_or_404(all_products, products_on_page, page_number)
products = paginated_page.object_list
view = request.session.get('view_type', 'tile')
return render(request, 'catalog/category_products.html', {
'product_image_pairs': merge_products_and_images(products),
'paginated_page': paginated_page,
'view_type': view,
'prods': products_on_page,
})
@require_POST
def save_feedback(request):
def get_keys_from_post(*args):
return {arg: request.POST.get(arg, '') for arg in args}
product_id = request.POST.get('id')
product = models.Product.objects.filter(id=product_id, page__is_active=True).first()
if not (product_id and product):
return http.HttpResponse(status=422)
fields = ['rating', 'name', 'dignities', 'limitations', 'general']
feedback_data = get_keys_from_post(*fields)
models.ProductFeedback.objects.create(product=product, **feedback_data)
return http.HttpResponse('ok')
@require_POST
def delete_feedback(request):
if not request.user.is_authenticated:
return http.HttpResponseForbidden('Not today, sly guy...')
feedback_id = request.POST.get('id')
feedback = models.ProductFeedback.objects.filter(id=feedback_id).first()
if not (feedback_id and feedback):
return http.HttpResponse(status=422)
feedback.delete()
return http.HttpResponse('Feedback with id={} was deleted.'.format(feedback_id))
class ProductsWithoutImages(catalog.ProductsWithoutImages):
model = models.Product
class ProductsWithoutText(catalog.ProductsWithoutText):
model = models.Product