如何在django中创建下拉菜单，并从创建的模型对象中进行选择？

from django.db import models

class Category(models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name

from django import forms
from .models import Category

class MyForm(forms.Form):
    category = forms.ModelChoiceField(queryset=Category.objects.all())

from django.shortcuts import render
from .forms import MyForm

def my_view(request):
    form = MyForm()
    return render(request, 'my_template.html', {'form': form})

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