为什么django不能接收表中的数据？

<form method="post" action="{% url 'submit_form' %}">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Submit</button>
</form>

from django.shortcuts import render, redirect
from .forms import YourForm

def submit_form(request):
    if request.method == 'POST':
        form = YourForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('success_url')
    else:
        form = YourForm()
    
    return render(request, 'submit_form.html', {'form': form})

from django import forms
from .models import YourModel

class YourForm(forms.ModelForm):
    class Meta:
        model = YourModel
        fields = '__all__'  # 或者指定需要的字段列表

from django.db import models

class User(models.Model):
    username = models.CharField(max_length=100)
    email = models.EmailField()

from django import forms
from .models import User

class UserForm(forms.ModelForm):
    class Meta:
        model = User
        fields = ['username', 'email']

from django.shortcuts import render, redirect
from .forms import UserForm

def user_form_view(request):
    if request.method == 'POST':
        form = UserForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('success')
    else:
        form = UserForm()
    
    return render(request, 'user_form.html', {'form': form})

<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Submit</button>
</form>