我需要帮助想出一种基于 M2M 字段对一组对象进行搜索查询的有效方法。我的搜索表单将类似于 Blue Cross Blue Shield 的 | 例如:这张图片
现在,假设我的模型如下所示:
# models.py
class Provider(models.Model)
title = models.CharField(max_length=150)
phone = PhoneNumberField()
services_offered = models.ManyToManyField(ServiceType)
def __unicode__(self):
return self.title
class ServiceCategory(models.Model):
service_category = models.CharField(max_length=30)
def __unicode__(self):
return self.service_category
class Meta(object):
verbose_name_plural = "Service Categories"
class ServiceType(models.Model):
service_type = models.CharField(max_length=30)
service_category = models.ForeignKey(ServiceCategory)
def __unicode__(self):
return u'%s | %s' % (self.service_category, self.service_type
此外,我们必须记住,我们选择的选项可能会发生变化,因为它们在表单上的显示方式是动态的(可以随时添加新的 ServiceCategories 和 ServiceTypes)。*考虑到使用搜索表单的人可以选择多个 Services_Offered,我应该如何构建 Provider 对象的查询?*
这是目前我非常低效的方法:
#managers.py
from health.providers.models import *
from django.db.models import Q
class Query:
def __init__(self):
self.provider_objects=Provider.objects.all()
self.provider_object=Provider.objects
self.service_object=ServiceType.objects
self.category_objects=ServiceCategory.objects.all()
def simple_search_Q(self, **kwargs): #matt's learning note: **kwargs passes any dictionary
return self.provider_objects.filter(
Q(services_offered__service_type__icontains=kwargs['service']),
Q(title__icontains=kwargs['title']),
Q(state=kwargs['state']),
).distinct().order_by('title')
=====================
#views.py
from django.shortcuts import render_to_response
from health.providers.models import *
from health.search.forms import *
from health.search.managers import Query #location of the query sets
from django.core.paginator import Paginator, InvalidPage, EmptyPage
from django.template import RequestContext
def simple_search(request):
if request.method == 'POST':
SimpleSearch_form = SimpleSearch(request.POST)
if SimpleSearch_form.is_valid():
request.session["provider_list"] = None
kwargs = {'title': request.POST['title'],
'service': request.POST['service'], 'state': request.POST['state'] }
provider_list = Query().simple_search_Q(**kwargs)
return pagination_results(request, provider_list)
else:
SimpleSearch_form = SimpleSearch()
return render_to_response('../templates/index.html', { 'SimpleSearch_form': SimpleSearch_form},
context_instance=RequestContext(request))
如何进行查询:
根据选择多个request.POST['service']获取Provider对象
更高效
感谢您在高级方面的任何帮助。
最好的问候,马特