我想根据优惠券的数量对标签进行排序。标签和商店模型具有多对多的关系，商店和优惠券具有一对多的关系。
my models.py:
class tags(models.Model):
""" This is the tag model """
seo_url = models.URLField() # SEO URL for mypromocodes.in
tagDescription = models.TextField() # Tag Description
tag = models.CharField(max_length=200) # Tag name
tagSlug = models.CharField(max_length=400) # Extra info can be added to the existing tag using this field
updatedAt = models.DateTimeField(auto_now=True) # Time at which tag is updated
createdAt = models.DateTimeField(auto_now_add=True) # Time at which tag is created
hash = models.CharField(max_length=10,unique=True) # Tag Hash for mypromocodes.in
def save(self, *args, **kwargs):
"""Custom Save method for tags model """
self.hash = _generateHash() # Generate Hash for mypromocodes.in
self.seo_url = "promocodes-in-" + self.tagSlug.replace(".","-") # Generate SEO URL for mypromocodes.in
super(tags, self).save(*args, **kwargs)
def __unicode__(self):
"""Method to display string correctly"""
return unicode(self.tag)
def storeNames(self):
"""Method to get store related to tag"""
for t in tags.objects.filter(tag=self.tag):
return ",".join([str(a.storeName) for a in t.stores_set.all()])
def storeHash(self):
"""Method to get store hash related to tag for mypromocodes.in"""
for t in tags.objects.filter(tag=self.tag):
return ",".join([str(a.hash) for a in t.stores_set.all()])
def tagURL(self):
"""Method to return tag URL for mypromocodes.in"""
return self.seo_url + _tagURL + self.hash
def couponsId(self):
for t in tags.objects.filter(tag=self.tag):
for a in t.stores_set.all():
return ",".join([str(i.id) for i in a.coupons_set.all()])
class Meta:
"""Meta class to control display Behavior of the Model name """
verbose_name_plural = "Tags"
#------------------------------------------------------------------------------
class stores(models.Model):
""" This is the store model """
seo_url = models.URLField() # SEO URL for mypromocodes.in
storeURL = models.URLField() # Store URL
fallBackURL = models.URLField() # Fallback URL for couponURL
storeDescription = models.TextField() # Store Description
storeTags = models.ManyToManyField(tags) # All the tags associated with the store
storeName = models.CharField(max_length=30) # Store Name
storeSlug = models.CharField(max_length=400) # This is the text you see in the URL
updatedAt = models.DateTimeField(auto_now=True) # Time at which store is updated
storeImage = models.ImageField(upload_to="images") # Store Image
createdAt = models.DateTimeField(auto_now_add=True) # Time at which store is created
hash = models.CharField(max_length=10,unique=True) # Tag Hash for mypromocodes.in
storePopularityNumber = models.IntegerField(choices=PRIORITY_CHOICES,default=3) # Store Popularity Number
def Store_Tags(self):
"""Method to return tags related to store"""
return ','.join([t.tagSlug for t in self.storeTags.all()])
def tagHash(self):
"""Method to get tag hash related to store for mypromocodes.in"""
return ','.join([t.hash for t in self.storeTags.all()])
def store_URL(self):
"""Method to return store URL for mypromocodes.in"""
return self.seo_url + _storeURL + self.hash
def StoreCoupons(self):
"""Method to return coupons related to store"""
for t in stores.objects.filter(storeName=self.storeName):
return ",".join([(a.couponTitle) for a in t.coupons_set.all()])
def StoreCouponsId(self):
"""Method to return coupons ID related to store"""
for t in stores.objects.filter(storeName=self.storeName):
return ",".join([str(a.id) for a in t.coupons_set.all()])
def CouponsCount(self):
"""Method to return coupons count related to store"""
for t in stores.objects.filter(storeName=self.storeName):
count = ",".join([str(a.id) for a in t.coupons_set.all()])
count = count.split(',')
count = filter(None,count)
return len(count)
def StoreImage(self):
"""Method to return store image for admin panel"""
return '<img src="%s%s" height="150" width="150"/>' % (MEDIA_URL , self.storeImage)
StoreImage.allow_tags = True
def StoreURL(self):
"""Method to return store URL"""
return '<a href="%(url)s" target="_blank">%(url)s</a>' %{"url":self.storeURL}
StoreURL.allow_tags = True
def imageURL(self):
"""Method to return store Image related to store"""
return HOST_NAME + "%s%s" % (MEDIA_URL , self.storeImage)
class Meta:
"""Meta class to control display Behavior of the Model name """
verbose_name_plural = "Stores"
def __unicode__(self):
"""Method to display string correctly"""
return unicode(self.storeName)
def save(self, *args, **kwargs):
self.hash = _generateHash() # Generate Hash for mypromocodes.in
self.seo_url = "coupons-in-" + self.storeName.replace(".","-") # Generate SEO URL for mypromocodes.in
super(stores, self).save(*args, **kwargs)
#------------------------------------------------------------------------------
class coupons(models.Model):
""" This is the coupon model """
couponURL = models.URLField() # Special URL for coupon provided by vendor
couponDescription = models.TextField() # Coupon Description
couponStore = models.ForeignKey(stores) # Key of coupon to store
failure = models.IntegerField(default=0) # Count of the number of times this has failed
success = models.IntegerField(default=1) # Count of the number of times people have made it work
active = models.BooleanField(default=True) # Coupon status active or not
couponCode = models.CharField(max_length=30) # Coupon code
couponValue = models.CharField(max_length=50) # Coupon value in Rs.
featured = models.BooleanField(default=False) # Coupon status featured or not
updatedAt = models.DateTimeField(auto_now=True) # Date on which coupon updated on
lastTested = models.DateTimeField(auto_now=True) # When was the coupon last tested
addedOn = models.DateTimeField(auto_now_add=True) # Date on which coupon added on
createdAt = models.DateTimeField(auto_now_add=True) # Date on which coupon is created
couponTitle = models.CharField(max_length=100,default="") # Coupon Title
def getCouponStoreName(self):
"""Method to return store name related to coupons"""
return self.couponStore.storeName
def storeHash(self):
"""Method to return store hash related to coupon for mypromocodes.in"""
return self.couponStore.hash
def couponStoreURL(self):
"""Method to return store Hash related to coupon for mypromocodes.in"""
return self.couponStore.seo_url + _storeURL + self.couponStore.hash
def convertLastTestedToDate(self):
"""Method to return convert lastTestedDtae format"""
return self.lastTested.strftime('%B %d %Y')
def storeImage(self):
"""Method to return store Image related to coupon"""
return self.couponStore.imageURL()
def couponVote(self):
"""This method returns coupons success %"""
returnVariable = int(float(self.success)/float(self.failure+self.success)*100)
return returnVariable
def commentCount(self):
"""Method to return Comment count related to count"""
for t in coupons.objects.filter(couponTitle=self.couponTitle):
count = ",".join([str(a.id) for a in t.comments_set.all()])
count = count.split(',')
count = filter(None,count)
return len(count)
def couponCommentData(self):
"""This method returns comment data related to coupon"""
temp = []
for i in coupons.objects.filter(id=self.id):
for y in i.comments_set.all():
dataDict = {'comment':y.comment,'addedOn':y.addedOn,'userName':y.userName}
temp.append(dataDict)
if temp:
returnVariable = sorted(temp, key=lambda k: k['addedOn'],reverse=False)
else:
returnVariable = []
return returnVariable
def __unicode__(self):
"""Method to display string correctly"""
return unicode(self.couponTitle)
class Meta:
"""Meta class to control display Behavior of the Model name """
verbose_name_plural = "Coupons"
我在标签模型中有couponsId方法可用于根据标签的数量对标签进行排序。请帮帮我。
答案 0 :(得分：5)
你走了：
from django.db.models import Count
sorted = coupons.objects.all()\
.annotate(tags_count=Count('couponStore__storeTags')\
.order_by('-tags_count')
没有什么是个人的，但你真的必须阅读这两个：