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一、应用场景

        假设我们现在有一个客房系统,前端界面上展示出来了所有客房的所有信息。用户通过客房的价格、面积、人数等对客房进行模糊搜索，如检索出价格在50到100元之间的客房，同时检索面积在20平方米到30平方米之间的客房，此时后端可以借助Q对象对客房进行筛选处理，并返回给前端。

二、代码部分

        学习笔记以注释的形式出现

from django.db.models import Q  
def searchHouse(request):datas = request.POSTtype = datas.get("type")area = datas.get("area")price = datas.get("money")people = datas.get("people")query = Q()# 使用Q对象组合多个查询条件type_value = int(type)if type_value != 0:query.add(Q(type=type_value-1), Q.AND)if area == "1":# 若area检索类型为"1",则为检索面积在0到15之间的客房query &= Q(area__range=(0, 15))# 给query添加上该查询语句elif area == "2":query &= Q(area__range=(15, 20))elif area == "3":query &= Q(area__range=(20, 30))elif area == "4":query &= Q(area__gte=30)if price == "1":query &= Q(price__range=(0, 50))elif price == "2":query &= Q(price__range=(50, 100))elif price == "3":query &= Q(price__range=(100, 200))elif price == "4":query &= Q(price__gte=200)if people == "1":query.add(Q(people=1), Q.AND)elif people == "2":query.add(Q(people=2), Q.AND)elif people == "3":query &= Q(people__gte=3)# 依照query对house表进行检索reses = house.objects.filter(query)houses = []for res in reses:a_house = {"id": res.id,"type": res.type,"area": res.area,"price": res.price,"people": res.people,"counts": res.counts,"status": res.status,"manager_phone": res.managerID.phone,"manager_name": res.managerID.name}houses.append(a_house)return JsonResponse({'data': houses}, safe=False)