Django详细视图查询-按外键对象筛选textchoices字段

我有以下两个模型-ToDoList和Tasks。Tasks具有ToDoList模型的Foreignkey。在我的Detailview中，我只想显示已发布的任务（status=“published”）

我试图覆盖视图的获取上下文数据。这起作用了。但它在Detailview中根本不显示任何任务实例，即使我将示例1任务设置为“已发布”

我还尝试在模板中执行筛选条件。我想这是不可能的？我或多或少确定筛选条件必须出现在查询集中

class ToDoList(TimeStamp):


    class STATUS(models.TextChoices): 
        PUBLISHED = "published", "Published" 
        TRASH = "trash", "Trash"
        WORKINGDRAFT = "workingdraft", "Workingdraft" 


    headline = models.CharField(max_length=200)
    author = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
    status = models.CharField("Status", max_length=20, choices=STATUS.choices, default=STATUS.PUBLISHED)



    def __str__(self):
        return self.headline

    def get_absolute_url(self):
        return reverse('notepad:todo_detail', args=[str(self.id)])


class Tasks(TimeStamp):

    class STATUS(models.TextChoices): 
        PUBLISHED = "published", "Published" 
        TRASH = "trash", "Trash"
        WORKINGDRAFT = "workingdraft", "Workingdraft" 


    todos = models.CharField(max_length=250)
    todolist = models.ForeignKey(ToDoList, on_delete=models.CASCADE, related_name='tasks')
    status = models.CharField("Status", max_length=20, choices=STATUS.choices, default=STATUS.PUBLISHED)


    def __str__(self):
        return self.todos

views.py

from django.shortcuts import render

# Create your views here.
from django.http import HttpResponseRedirect
from django.forms.models import inlineformset_factory
from django.views.generic import ListView, DetailView, TemplateView
from django.views.generic.edit import CreateView
from django.urls import reverse
from django.urls import reverse_lazy

from .models import ToDoList, Tasks
from .forms import ToDoListForm

class ToDoDetailView(DetailView):
    model = ToDoList
    template_name = 'notepad/notepad_detail.html'

    def get_context_data(self,**kwargs):
        context = super(ToDoDetailView,self).get_context_data(**kwargs)
       context['tasks_published'] = self.object.tasks.filter(status="published")
        return context    

    def get_object(self):
        object = super(ToDoDetailView, self).get_object()
        object.num_tasks = object.tasks.all().count()
        return object

模板

<!-- templates/books/book_detail.html -->
{% extends 'base.html' %}

{% block title %}{{ object.headline }}{% endblock title %}

{% block content %}
<div class="book-detail">
<h2><a href="">{{ object.headline }}</a></h2> 
<p>Author: {{ object.author }}</p> 
<p>Created at: {{ object.created }}</p>

<p>Total Tasks: {{ object.num_tasks }}</p>



<div>
    <h3>Tasks</h3> <ul>
    {% for todo in tasks_published %}
    <li>{{ todo.todos }}</li> 
    {% endfor %}
    </ul> </div>
</div>

<a class="btn btn-primary"
href="{% url 'notepad:todo_list' %}" role="button">
Back to ToDo List
</a> </p>
{% endblock content %}

{%extends'base.html%}
{%block title%}{{object.headline}{%endblock title%}
{%block content%}
作者：{{object.Author}}

创建时间：{{object.Created}

任务总数：{{object.num_Tasks}

任务

{任务中todo的%u已发布%}
{{todo.todos}}
{%endfor%}


{%endblock内容%}

任何帮助都将不胜感激。 非常感谢您的时间和支持。

请尝试：

def get_context_data(self,**kwargs):
    context = super(ToDoDetailView,self).get_context_data(**kwargs)
    context['tasks_published'] = self.object.tasks.filter(status=STATUS.PUBLISHED)
    return context 

因为在您的代码中，您将拥有ToDoList实例列表，而不是任务列表。在DetailView（）中，您需要查看当前TodoList的已发布任务，对吗？

请尝试：

def get_context_data(self,**kwargs):
    context = super(ToDoDetailView,self).get_context_data(**kwargs)
    context['tasks_published'] = self.object.tasks.filter(status=STATUS.PUBLISHED)
    return context 

---

因为在您的代码中，您将拥有ToDoList实例列表，而不是任务列表。在DetailView（）中，您需要查看当前TodoList的已发布任务，对吗？

尝试在

CharField

中的choice tuple中执行以下操作，将choices属性更改为i give tuple

#define_tuple
PUBLISHED = (
    ('published','Published'),
    ('trash','Trash'),
    ('workingdraft','Workingdraft'),
)

class ToDoList(TimeStamp):
    headline = models.CharField(max_length=200)
    author = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
    #change in following line 
    status = models.CharField("Status", max_length=20, choices=PUBLISHED, default='published') #here change

    def __str__(self):
        return self.headline

---

在这两种模型中都进行尝试，并检查其工作是否完美让我知道

在您的

CharField

中尝试以下选项元组，将选项属性更改为i give tuple

#define_tuple
PUBLISHED = (
    ('published','Published'),
    ('trash','Trash'),
    ('workingdraft','Workingdraft'),
)

class ToDoList(TimeStamp):
    headline = models.CharField(max_length=200)
    author = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
    #change in following line 
    status = models.CharField("Status", max_length=20, choices=PUBLISHED, default='published') #here change

    def __str__(self):
        return self.headline

---

在两种型号中都试用，并检查其工作是否完美，请告诉我

非常感谢。这给了我以下错误：未定义名称“STATUS”。但是“自我、目标、任务”是我错过的。正确的查询是：context['tasks\u published']=self.object.tasks.filter（status=“published”）。我编辑我的问题。尝试在视图中导入状态非常感谢。这给了我以下错误：未定义名称“STATUS”。但是“自我、目标、任务”是我错过的。正确的查询是：context['tasks\u published']=self.object.tasks.filter（status=“published”）。我编辑我的问题。尝试在视图中导入状态