过滤对象或(如果找到0)通过一次DB命中获取Django中的所有对象

from django.shortcuts import render
from .models import YourModel

def your_view(request):
    # 尝试过滤对象
    filtered_objects = YourModel.objects.filter(some_condition=True)
    
    # 如果没有找到任何对象，则获取所有对象
    if not filtered_objects.exists():
        filtered_objects = YourModel.objects.all()
    
    # 将对象传递给模板进行渲染
    context = {'objects': filtered_objects}
    return render(request, 'your_template.html', context)

# 在模型中为查询条件中的字段添加索引
class YourModel(models.Model):
    some_field = models.CharField(max_length=100, db_index=True)
    # 其他字段...

# 使用分页器处理大量数据
from django.core.paginator import Paginator

def your_view(request):
    filtered_objects = YourModel.objects.filter(some_condition=True)
    
    if not filtered_objects.exists():
        filtered_objects = YourModel.objects.all()
    
    paginator = Paginator(filtered_objects, 10)  # 每页显示10条记录
    page_number = request.GET.get('page')
    page_obj = paginator.get_page(page_number)
    
    context = {'page_obj': page_obj}
    return render(request, 'your_template.html', context)