使用ModelForm创建对象时，如何关联ForeignKey？

from django import forms
from .models import ParentModel, ChildModel

class ParentModelForm(forms.ModelForm):
    class Meta:
        model = ParentModel
        fields = ['name', 'child']

class ChildModelForm(forms.ModelForm):
    class Meta:
        model = ChildModel
        fields = ['name']

# 在视图函数中处理表单提交和显示
from .forms import ParentModelForm

def create_parent(request):
    if request.method == 'POST':
        form = ParentModelForm(request.POST)
        if form.is_valid():
            parent = form.save()
            # 处理成功的逻辑
    else:
        form = ParentModelForm()
    
    return render(request, 'create_parent.html', {'form': form})

<!-- create_parent.html 模板文件 -->
<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <input type="submit" value="创建">
</form>