0

我有三个相互关联的模型：

地址/models.py：

class Town(models.Model):
    name = models.CharField(max_length=200, db_index=True, unique=True)

def __str__(self):
    return '%s' % self.name
def get_absolute_url(self):
    return reverse('home:home_by_town', args=[self.slug])

class Street(models.Model):
    town = models.ForeignKey(Town, default=id(1), related_name='streets')
    name = models.CharField(max_length=200, db_index=True)

def get_absolute_url(self):
    return reverse('home:home_by_town', args=[self.slug])

提供者/models.py：

class Provider(models.Model):
    location = models.ManyToManyField(Street, db_index=True, symmetrical=False, related_name='providers')
    name = models.CharField(max_length=200, db_index=True)

我已经搜索了为街道服务的提供商：

def search_results(request, town_slug=None):
    regions = Region.objects.filter(is_active=True)
    town = None
    towns = Town.objects.filter(is_active=True)
    streets = Street.objects.all()
    if town_slug:
        town = get_object_or_404(Town, slug=town_slug)
        streets = Street.objects.filter(town=town)
        streets_list = list(str(p.name) for p in streets)
form = SearchForm()
query = None
results = []
if 'query' in request.GET:
    form = SearchForm(request.GET)
    if form.is_valid():
        query = form.cleaned_data['query']
        results = Provider.objects.prefetch_related('location').annotate(
            similarity=TrigramSimilarity('location__name', query), min=Min('tariffs__price'),
        ).filter(similarity__gt=0.87).distinct().order_by('-similarity')
        # tariffs__tariff_details__price
        return render(request, 'home/search_results.html', locals())
else:
    form = SearchForm()

return render(request, 'home/search_results.html', locals())

这一切都很好，因为我们正在寻找所有街道location__name 记录中的对象，我会对结果感到满意，但我不明白如何将过滤后的街道列表按城市放入 TrigramSimilarity 方法street = Street.objects。过滤器（城镇 = 城镇）

我希望我的搜索结果在这个表现中起作用：

results = Provider.objects.prefetch_related('location').annotate(
            similarity=TrigramSimilarity(streets, query), min=Min('tariffs__price'),
        ).filter(similarity__gt=0.87).distinct().order_by('-similarity')

但是这种构造给了我一个异常值：子查询应该只返回一列

有人知道如何解决这个问题吗？也许有人遇到过这个？

4

0 回答 0