Django中的复杂过滤

Question

我有一个(简化的)Django模型，如下所示:

models.py

# python
class Hotel(models.Model):
     name = models.Charfield()
class RoomType(models.Model):
     hotel=models.ForeignKey(Hotel, related_name="roomtypes")
     price=models.IntegerField() # really  a currency field
class Room(models.Model):
     hotel = models.ForeignKey(Hotel)
     roomType = models.ForeignKey(RoomType, related_name="rooms")
class Reservation(models.Model):
     room = models.ForeignKey(Room)
     date = models.DateField()

所以我需要我的模板的层次结构是Hotel->RoomType->Room，其中每个都被过滤了。

views.py

# only get available rooms that meet the user supplied criteria in q
q = Q() # complex query building omitted
rooms = Room.objects.filter(q) 
# only get roomtypes that have rooms meeting criteria in q
roomTypesValues = rooms.values_list('roomType', flat=True)
roomTypes = RoomType.objects.filter(pk__in=list(roomTypesValues))
# only get hotels that have rooms meeting criteria in q
hotelsValues = roomTypes.values_list('hotel', flat=True)
hotels = Hotel.objects.filter(pk__in=list(hotelsValues))
c=RequestContext(request, {'hotels': hotels})

这些查询在某种程度上都是有效的。我还不知道如何在模板中使用它们。

我试图得到这样的工作(HTML简化):

template.html

{% for hotel in hotels %}
<h1>{{hotel.name}}</h1>
   <ul>
   {% for roomtype in hotel.roomtypes %}
     <li>
       {{roomtype.name]}, {{roomtype.price}}
       {% for room in roomtype.rooms %}
            <!-- not really needed for this -->
       {% endfor %}
     </li>
   {% endfor %}
   </ul>
{% endfor %}

如何将对象传递给模板，以便我可以以类似于上面的方式处理它们?

Answer 1

您的第一个代码片段可以简化为这一个调用:

hotels = Hotel.objects.filter(roomtype__room=<whatever your criteria are>)

您不能在模板中执行此查询，但是您可以将hotels查询集传递给模板以在那里呈现。