如何在Django中集成下拉列表中的多选字段

from django.db import models

class MyModel(models.Model):
    my_field = models.ManyToManyField('Option')

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

    def __str__(self):
        return self.name

from django import forms
from .models import MyModel, Option

class MyForm(forms.ModelForm):
    class Meta:
        model = MyModel
        fields = ['my_field']

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

<form method="post">
  {% csrf_token %}
  {{ form.my_field }}
  <input type="submit" value="Submit">
</form>