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Python Django ORM Total Control select_related

Posted by Pridemore Viriri
Pridemore Viriri
10,570 Points

The view for an individual Review always has to talk about the Product that it relates to. This means we have to do at l

Hie Guys. Kindly assist on the solution for the question.

products/views.py 
import datetime

from django.db.models import Q, Avg
from django.http import Http404
from django.shortcuts import render, get_object_or_404

from . import models


def good_reviews(request):
    reviews = models.Review.objects.filter(rating__gte=3)
    return render(request, 'products/reviews.html', {'reviews': reviews})


def recent_reviews(request):
    six_months_ago = datetime.datetime.today() - datetime.timedelta(days=180)
    reviews = models.Review.objects.exclude(created_at__lt=six_months_ago)
    return render(request, 'products/reviews.html', {'reviews': reviews})


def product_detail(request, pk):
    try:
        product = models.Product.objects.prefetch_related('review_set').get(pk=pk)
    except models.Product.DoesNotExist:
        raise Http404()
    four_weeks_ago = datetime.datetime.today() - datetime.timedelta(weeks=4)
    reviews = product.review_set.filter(Q(rating__gte=8)|Q(created_at__gte=four_weeks_ago)).order_by('-created_at').all()
    return render(request, 'products/product_detail.html', {'product': product, 'reviews': reviews})


def product_list(request):
    products = models.Product.objects.annotate(avg_rating=Avg('review__rating')).all()
    return render(request, 'products/product_list.html', {'products': products})


def review_detail(request, product_pk, pk):
    try:
        review = models.Review.objects.get(product_id=product_pk, pk=pk)
    except models.Review.DoesNotExist:
        raise Http404()
    else:
        return render(request, 'products/review_detail.html', {'review': review})