Question

get_object_or_404（）的第一个参数必须是Model，Manager或QuerySet，而不是“ function”。

我正在尝试根据数据库中的平板电脑显示平板电脑详细信息，但它一直在显示此ValueError。谁能帮助我找出我做错了什么？

这是我的views.py

from django.shortcuts import render, get_object_or_404
from .models import PharmaceuticalCapsules, PharmaceuticalSuspension, 
PharmaceuticalPowder, PharmaceuticalSyrup, \
PharmaceuticalTablet


def alltablet(request):
tablet = PharmaceuticalTablet.objects
return render(request, 'tablets.html', {'tablet': tablet})


def tabdetail(request, tab_id):
tabdetail = get_object_or_404(alltablet, pk=tab_id)
return render(request, 'tab_detail.html', {'tablet': tabdetail})

这是我的模特。py

from typing import re
from django.db import models

class PharmaceuticalTablet(models.Model):
tab_name = models.CharField(max_length=100)
tab_image = models.ImageField(upload_to='image/', blank=True, null=True)
tab_dose_strength = models.CharField(max_length=100)
tab_pack = models.CharField(max_length=100)
tab_form = models.CharField(max_length=200)
tab_dose = models.CharField(max_length=100, default='Direction By Physician')
tab_storage = models.CharField(max_length=100)
tab_usage = models.CharField(max_length=100)
tab_brandname = models.CharField(max_length=100)
tab_composition = models.CharField(max_length=100)

def __str__(self):
    return self.tab_name

浏览器显示

ValueErrorat /tablet/1/
First argument to get_object_or_404() must be a Model, Manager, or QuerySet, not 'function'.
Request Method:
GET 
Request URL:
http://127.0.0.1:8000/tablet/1/ 

Django Version:
v2.2.1 

Exception Type:
ValueError 

Exception Value:
First argument to get_object_or_404() must be a Model, Manager, or QuerySet, not 'function'.

Answer 1

就像错误所示一样，您试图将一个函数而不是查询集或模型传递给get_object_or_404(...)。我认为除非您希望之前对其进行过滤，否则您想使用PharmaceuticalTablet.objects.all()。


def alltablet(request):
    tablet = PharmaceuticalTablet.objects
    return render(request, 'tablets.html', {'tablet': tablet})


def tabdetail(request, tab_id):
    tabdetail = get_object_or_404(PharmaceuticalTablet.objects.all(), pk=tab_id)
    return render(request, 'tab_detail.html', {'tablet': tabdetail})

Answer 2

tabdetail = get_object_or_404（PharmaceuticalTablet，pk = tab_id）

进行更改。您要确定模态，而不是函数。

get_object_or_404（）的第一个参数必须是Modelt，而不是'function'

2 个答案: