如何在django中通过外键连接从对象获取特定值？

from django.db import models

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

class ChildModel(models.Model):
    parent = models.ForeignKey(ParentModel, on_delete=models.CASCADE)
    value = models.CharField(max_length=100)

python manage.py makemigrations
python manage.py migrate

from django.shortcuts import render
from .models import ParentModel

def get_specific_value(request, parent_id):
    parent = ParentModel.objects.get(id=parent_id)
    child_value = parent.childmodel_set.first().value
    return render(request, 'template.html', {'child_value': child_value})

<h1>Child Value: {{ child_value }}</h1>