给定一个产品(product_name 是视图中的一个参数),我试图返回该类别中排名靠前的 5 个产品(由方法“get_avg_rating”定义)作为我可以在模板中循环的列表。关于如何做到这一点的任何建议?
class Productbackup(models.Model):
website = models.CharField('Product name', max_length = 200)
url_friendly = models.CharField('URL friendly', max_length = 200)
website_url = models.URLField('Product URL')
description= models.CharField('Description', max_length = 2000)
category = models.ForeignKey(Categories)
#category = models.ManyToManyField(Categories)
image_hero = models.URLField('Hero image url')
image_second = models.URLField('Second image url')
image_third = models.URLField('Third image url')
created_on = models.DateTimeField(auto_now_add = True)
updated_at = models.DateTimeField(auto_now = True)
def __unicode__(self):
return self.website
def get_avg_rating(self):
reviews = Reviewbackup.objects.filter(product=self)
count = len(reviews)
sum = 0.0
for rvw in reviews:
sum += rvw.rating
return (sum/count)
def get_num_reviews(self):
reviews = Reviewbackup.objects.filter(product=self)
count = len(reviews)
return count
RATING_OPTIONS = (
(1, '1'),
(2, '2'),
(3, '3'),
(4, '4'),
(5, '5'),
(6, '6'),
(7, '7'),
(8, '8'),
(9, '9'),
(10, '10'),
)
class Reviewbackup(models.Model):
review = models.CharField('Review', max_length = 2000)
created_on = models.DateTimeField(auto_now_add = True)
updated_at = models.DateTimeField(auto_now = True)
user = models.CharField('Username', max_length = 200)
rating = models.IntegerField(max_length=2, choices=RATING_OPTIONS)
product = models.ForeignKey(Productbackup)
def __unicode__(self):
return self.review
class Categories(models.Model):
category = models.CharField('Category_second', max_length = 200)
url_friendly = models.CharField('url_friendly', max_length = 200)
def __unicode__(self):
return unicode(self.category)
def view_reviews(request, product_name):
product = get_object_or_404(Productbackup, url_friendly=product_name)
product_id = product.id
#get reviews for the this product
reviews = Reviewbackup.objects.filter(product_id=product_id).order_by("-created_on")
#similar products in category comparison
prod_category = Productbackup.objects.filter(category=product.category)
#top_ranked = Productbackup.objects.order_by('get_avg_rating')[0:5]
#recently added
recent_added = Productbackup.objects.order_by('-created_on')[0:5]
return render_to_response('reserve/templates/view_reviews.html', {'prod_category': prod_category, 'product':product, 'reviews':reviews, 'recent_added':recent_added},
context_instance=RequestContext(request))