我现在想要实现的目标:
我觉得我很亲密,但却缺少一些我需要的关系。能够使用以下内容获得高评价的鞋子评论会非常方便。
ShoeReview.objects.filter(owner_review__ratings__rating_attribute = 'overall').sort_by(owner_review__ratings__rating)
我认为以上是正确的?同样,对django来说是新的,所以请原谅任何愚蠢的错误。和往常一样,在我问这里之前,我已经用我的代码破解了几天,所以不要以为我只是在没有自己付出努力的情况下发布了它。
以下是models.py文件内容:
from django.db import models
from django.contrib.auth.models import User
from tagging.fields import TagField
class Brand(models.Model):
def __unicode__(self):
return self.name
name = models.CharField(max_length=200)
popularity = models.PositiveIntegerField(default=0)
class Shoe(models.Model):
def __unicode__(self):
return self.name
brand = models.ForeignKey(Brand)
name = models.CharField(max_length=200)
description = models.TextField()
price = models.PositiveIntegerField()
buylink = models.URLField(verify_exists='true', default="http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%2Fwww.amazon.com%2FAthletic-Outdoor%2Fb%3Fie%3DUTF8%26node%3D679564011%26ref_%3Damb%5Flink%5F23091522%5F13&tag=runnshoerevi-20&linkCode=ur2&camp=1789&creative=390957", max_length=400)
picture = models.ImageField(upload_to='shoes', blank=True, default="shoes/default_picture.jpg")
youtube_video_id = models.CharField(max_length=25, blank=True)
class RatingAttributes(models.Model):
def __unicode__(self):
return self.attribute
attribute = models.CharField(max_length=65)
class Rating(models.Model):
def __unicode__(self):
return "%s, %s: %s" % (str(self.author), str(self.rating_attribute), str(self.rating))
rating_attribute = models.ForeignKey(RatingAttributes)
author = models.ForeignKey(User)
pub_date = models.DateTimeField(auto_now_add='true')
rating = models.IntegerField(blank=True, null=True)
class OwnerReview(models.Model):
def __unicode__(self):
return self.comments
author = models.ForeignKey(User)
pub_date = models.DateTimeField(auto_now_add='true')
shoe = models.ForeignKey(Shoe)
youtube_video_id = models.CharField(max_length=25, blank=True)
comments = models.TextField()
# this field will be increased every time a user clicks "this review was helpful and all reviws will be sorted by the helpfulness value
ratings = models.ForeignKey(Rating)
helpfulness = models.IntegerField(default=0, blank=True)
class ShoeReview(models.Model):
def __unicode__(self):
return self.title
pub_date = models.DateTimeField(auto_now_add='true')
author = models.ForeignKey(User, related_name='reviews')
title = models.CharField(max_length=200)
keywords = models.CharField(max_length=800, blank=True, default="Shoe Review")
slug = models.SlugField(unique=True)
cur_shoe = models.ForeignKey(Shoe)
staff_opinion = models.TextField()
owner_review = models.ForeignKey(OwnerReview)
shoe_activities = TagField()
答案 0 :(得分:1)
而不是:
ShoeReview.objects.filter(owner_review__ratings__rating_attribute = 'overall').sort_by(owner_review__ratings__rating)
你应该致电:
ShoeReview.objects.filter(owner_review__ratings__rating_attribute__attribute = 'overall').order_by(owner_review__ratings__rating)
owner_review__ratings__rating_attribut
期望模型(它将从模型中检索pk并在查询中使用它)。还有order_by方法,而不是sort_by。除了那个查询似乎没问题。尝试运行它,并告诉您,如果您得到结果或有一些错误。尝试在./manage.py shell
中运行它,这样可以轻松快速地检查它是否有效。
答案 1 :(得分:1)
你应该这样做:
ShoeReview.objects\
.filter(owner_review__ratings__rating_attribute__attribute='overall')\
.order_by(owner_review__ratings__rating)
但实际上,你最好使用经理:
class BestShoesReviewManager(models.Manager):
def get_query_set(self):
qs = super(DahlBookManager, self).get_query_set()
return qs.filter(owner_review__ratings__rating_attribute__attribute= 'overall')\
.order_by(owner_review__ratings__rating)
这样你就可以:
class ShoeReview(models.Model)
objects = models.Manager() # The default manager.
best = BestShoesReviewManager() # The best review manager.
在您的代码中,您可以这样做:
ShoeReview.objects.best()