Python 带外键的ModelForm

需要Django模型表单的帮助。我想在一个对象（如博客）的末尾创建一个表单，“评论”表单位于“帖子”的末尾，我尝试了几个教程，它们有以下示例：

class formCom(ModelForm):
class Meta : 
    model = Comentario
    exclude = ["idE"]



def poncomentario(request, pk):
p = request.POST
if 'message' in p:
    author = 'Anonymous'
    if p['author']:
        author = p["author"]
    comment = Comment(idE = Post.objects.get(pk=pk))
    cf = formCom(p, instance = comentario)
    cf.fields["author"].required = False
    comment = cf.save(commit = False)
    comment.author = author
    comment.save()
return HttpResponseRedirect(reverse("bloging.views.post", args=[pk]))

我尝试了同样的方法，但我的模型“Evolucion”有20个字段：

def evo_crear(request,reg):
if request.method == 'POST':    
    evol = Evolucion(idhisto = HistoriaClinica.objects.get(pk=reg))
    form = EvoForm(request.POST, instance = evol)
    evol = form.save(commit = False)
    evol.save()
else:
    form = EvoForm()
return HttpResponseRedirect(reverse("Historias.views.detalle", args=[reg]))

在forms.py，我有：

from django import forms
from Historias.models import *
class HistoForm(forms.ModelForm):
    class Meta:
model = HistoriaClinica
class EvoForm(forms.ModelForm):
    class Meta:
        model = Evolucion
    exclude = ["idhisto"]

在模板上：

 <form action="" method="POST">
{% csrf_token %}
{{form.as_p}}
<input type="submit" value="Save" />

{%csrf_令牌%}
{{form.as_p}}

但我的表格从来不会只显示“输入”。我做错了什么？

---

Python3.4和Django 1.7

这是因为在您的视图中，从未在上下文中发送表单对象。查看

render

方法..我应该使用

return render\u to\u response（'Histo/detail.html'，{'form'：form}，context\u instance=RequestContext（request））