Question

我正在处理一个Todo列表，该列表具有单独的用户和他们自己的列表。最初，我将models.py设置为：

from django.db import models
from django.contrib.auth.models import User



class Todo(models.Model):
    text = models.CharField(max_length=40, default='Test User')
    complete = models.BooleanField(default = False)
    task_priority = models.CharField(max_length=40, default='high')
    def __str__(self):
        return self.text

但是，当我尝试将单个用户与其自己的todotask（文本字段）集合及其优先级和状态链接在一起时。

我在这样的字段中添加了一个：

from django.db import models
from django.contrib.auth.models import User



class Todo(models.Model):
    user = models.OneToOneField(User,on_delete=models.CASCADE,primary_key='user_id') #new
    text = models.CharField(max_length=40, default='Test User')
    complete = models.BooleanField(default = False)
    task_priority = models.CharField(max_length=40, default='high')
    def __str__(self):
        return self.text

它抛出了这样的错误：

FieldError位于/ 无法将关键字“ id”解析为字段。选项包括：完整，任务优先级，文本，用户，用户ID

我不完全理解一对一字段的概念，在困惑的天气中在线查看教程，我需要制作另一个表并将其链接到Todo表或使用主键添加另一个字段？

帮我理解这个概念。预先感谢。

编辑： views.py文件：

from django.shortcuts import render, redirect
from .models import Todo
from .form import TodoForm,ContactForm
import datetime 
from django.conf import settings
from django.utils import timezone
from django.views.decorators.http import require_POST
from django.core.mail import send_mail, BadHeaderError
from django.http import HttpResponse, HttpResponseRedirect
import json



def index(request):
    todo_list = Todo.objects.order_by('id')
    form = TodoForm()
    mydate = datetime.datetime.now()

    context = {'todo_list': todo_list, 'form': form, 'mydate':mydate}

    return render(request,'todo/index.html',context)

def login(request):
    return render(request, 'todo/login.html')


@require_POST
def addTodo(request):
    form = TodoForm(request.POST)
    text_input = form.get_cleaned_data['text']
    priority_input = form.get_cleaned_data['task_priority']
    if form.is_valid():
        new_todo = Todo(text = text_input, task_priority = priority_input)
        # new_todo = Todo(text = request.POST['text'])
        new_todo.save()
    return redirect('index')

def completeTodo(request, todo_id):
    todo = Todo.objects.get(pk=todo_id)
    todo.complete = True
    todo.save()

    return redirect('index')

def deleteCompleted(request):
    Todo.objects.filter(complete__exact=True).delete()

    return redirect('index')

def deleteAll(request):
    Todo.objects.all().delete()

    return redirect('index')


def emailView(request):

    todo = Todo.objects.all();
    task_list = []
    status_list = []
    for item in todo:
        stritem=str(item)
        task_list.append(stritem)
        if item.complete == True:
            status_list.append('complete')
        else:
            status_list.append('incomplete')


    if request.method == 'GET':
        form = ContactForm()
    else:
        form = ContactForm(request.POST)
        if form.is_valid():

            from_email = form.cleaned_data['from_email']
            message = form.cleaned_data['message']
            #maillist = Todo.objects.all()
            email_list=dict(zip(task_list,status_list))
            strlist = json.dumps(email_list)
            content = message + strlist
            try:
                send_mail('Todo List', content ,settings.EMAIL_HOST_USER,[from_email])
            except BadHeaderError:
                return HttpResponse('Invalid header found.')
            return redirect('success')
    return render(request, "email.html", {'form': form})

def successView(request):
    return HttpResponse('Success! Thank you for your message.')

新模型。py：

from django.db import models
from django.contrib.auth.models import User



class Todo(models.Model):
    user = models.OneToOneField(User,on_delete=models.CASCADE)
    text = models.CharField(max_length=40, default="")
    complete = models.BooleanField(default = False)
    task_priority = models.CharField(max_length=40, default='high')
    def __str__(self):
        return self.text

遇到

在/ add NOT NULL约束处的
IntegrityError失败：todo_todo.user_id

Answer 1

此：

user = models.OneToOneField(User,on_delete=models.CASCADE,primary_key='user_id')

根本没有按照您的想法去做。 primary_key需要一个布尔值，而不是字段名，并且与该关系完全无关。由于字符串'user_id'不为空，因此将其解释为True，并等同于：

user = models.OneToOneField(User,on_delete=models.CASCADE,primary_key=True)

，这意味着user现在是Todo模型的主键。这不是你想要的。

删除该primary_key子句。

无法将关键字“ id”解析为字段。选择包括：完整，任务优先级，文本，用户，用户ID

1 个答案: