如何将选择框的值作为外键传递(Django)

from django.db import models

class Choice(models.Model):
    choice_value = models.CharField(max_length=100)

class ForeignKeyModel(models.Model):
    foreign_key = models.ForeignKey(Choice, on_delete=models.CASCADE)

from django.shortcuts import render
from .models import Choice, ForeignKeyModel

def my_view(request):
    if request.method == 'POST':
        choice_value = request.POST.get('choice_value')
        choice = Choice.objects.get(choice_value=choice_value)
        foreign_key_model = ForeignKeyModel.objects.create(foreign_key=choice)
        # 其他处理逻辑...
    else:
        # 渲染包含选择框的表单页面
        choices = Choice.objects.all()
        return render(request, 'my_template.html', {'choices': choices})

<form method="post" action="{% url 'my_view' %}">
  {% csrf_token %}
  <select name="choice_value">
    {% for choice in choices %}
      <option value="{{ choice.choice_value }}">{{ choice.choice_value }}</option>
    {% endfor %}
  </select>
  <button type="submit">提交</button>
</form>