如何在 Django 的数据库中将表单响应保存为 object？

Question

I am unable to save my form responses to the database as an object in Django. Everytime I click on submit to submit my form, I am just logged out of my website and the object isnt saved in the database either. Can anyone tell me where I am going wrong? This is my models in models.py.

class Chain(models.Model):
    name = models.CharField(max_length=255)
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    year = models.CharField(max_length=10, default="20XX")
    sem = models.CharField(max_length=30, default="Default Semester")
    code = models.CharField(max_length=10, default="SUB-CODE")
    slot = models.CharField(max_length=10, default="EX+EX")
    last_updated = models.DateTimeField(auto_now=True)

    def __str__(self):
        return self.name

This is my view in views.py file.

@login_required(login_url='/')
def create_course(request):
    if request.method == 'GET':
        return render(request, 'create_course.html', {})
    elif request.method == 'POST':    
        name=request.POST['name']
        year=request.POST['year']
        sem=request.POST['sem']
        code=request.POST['code']
        slot=request.POST['slot']
        newchain = Chain(
            name=name,
            year=year,
            sem=sem,
            code=code,
            slot=slot,
        )
        newchain.user = request.user
        newchain.save()
        return redirect('success')

This is my HTML code for the form.

{% extends 'authmain.html' %}

{% block content %}
<h3> <p class="text-center"> Create a new Course Blockchain: </p> </h3>

<div class="card border-dark mb-3 mx-auto" align="center" style="width: 40rem;">
  <div class="card-body">
    <h5 class="card-title">
      <form method='POST'>
        {% csrf_token %}
        <label for="year">Year: </label>
        <input type="text" id="year" name="year" value=""><br>
        <label for="code">Course Code: </label>
        <input type="text" id="code" name="code" value=""><br>
        <label for="name">Course Name: </label>
        <input type="text" id="name" name="name" value=""><br>
        <label for="slot">Slot: </label>
        <input type="text" id="slot" name="slot" value=""><br>
        <label for="sem">Semester: </label>
        <input type="text" id="sem" name="sem" value=""><br>
        <button class="btn btn-outline-primary" type="Submit"> Create </button>
      </form>
    </h5>
    </div>
</div>

{% endblock %}

This is my urls.py.

from django.urls import path, include
from . import views

urlpatterns = [
    path('', views.home, name="home"),
    path('register/', views.register, name="register"),
    path('logout/', views.logoutuser, name="logoutuser"),
    path('dashboard/', views.dashboard, name="dashboard"),
    path('create_course/', views.create_course, name="create_course"),
    path('success', views.success, name="success"),
]

This is the view function for success.

@login_required(login_url='/')
def success(request):
    return render(request, 'success.html', {})

Answer 1

To save directly in the database in Django use Model.objects.create()

Chain.objects.create(user=request.user, name=name, year=year, sem=sem, 
                      code=code, slot = slot)

Answer 2

The issue is that you are not closing form tag in the authmain.html .

<ul class="navbar-nav ml-auto">
  <li class="nav-item">
  <form action="{% url 'logoutuser' %}" method='POST'>
  {% csrf_token %}
    <button class="btn btn-outline-info mb-auto" type="submit">Logout</button>
  -----  CLOSING FORM TAG MISSING HERE ---
  </li>
</ul>

and when you submit the form at Create Course, you actually trigger this form, which logs out the user. Add closing tag to the logout form and you'll fix your problem.

Sometimes debugging can be a bit tricky.

Answer 3

You need to use a model form to achieve this

class MyForm(ModelForm):
     class Meta:
         model = MyModel
         fields = []

And then you can do something like this:

 form = MyForm(request.POST)
 if form.is_valid():
       new_item = form.save()
       ...

And it will save directly to the database.