Require help in Django 'local variable 'form' referenced before assignment'

Question

Hello, I am having problem in django. I have created a form in my app where I can take details of a client. Now I want to create a form which can allow me to edit a form. However I am having some problems when I go to /index/edit_client/1, I get this error.

local variable 'form' referenced before assignment

I do not know what the reason why I have got this error, but from what I have looked at, it does not help matters unless of course there is another way how to create an edit form to edit the clients form. Here are some output that can be helpful too.

# urls.py
    urlpatterns = patterns('',
    (r'^index/$', login_required(direct_to_template), { 'template': 'index.html' }),
    (r'^index/clients/$', client_info),
    (r'^index/clients_details/(?P<id>\d+)/$', clients_details),
    (r'^index/edit_client/(?P<id>\d+)/$', edit_client),
)

# views.py
@login_required 
def edit_client(request, id=1):
 clients_list = Client.objects.filter(pk=id)  
 if request.method == 'POST':
  form = ClientForm(request.POST or None)
  if form.is_valid():
   form.save()
   return HttpResponseRedirect('/index/clients/')
  else: form = ClientForm()
 return render_to_response('edit_client.html', {'form': form},  context_instance=RequestContext(request))

#edit_client.html
{% extends "base.html" %}

{% block content %}
<font face="verdana,news gothic,arial,heltevica,serif">
<h3>Edit Client</h3>
</font>
 <form method= "POST" action="">
  <font face="verdana,news gothic,arial,heltevica,serif">
  <div id="form">
  <table>
   {{form.as_table}}
  </table>
  <div align="center" STYLE=" margin-right:190px">
  <input type="submit" value="Submit" STYLE="background-color:#E8E8E8; color:#181818 "/>
  </div>
  </div>
 </form>
{% endblock %}

Answer 1

This will always run:

return render_to_response('edit_client.html', {'form': form}

But if request.method is not POST, nothing is assigned to form.

Fixed code:

@login_required 
def edit_client(request, id=1):
 clients_list = Client.objects.filter(pk=id)  
 form = ClientForm()
 if request.method == 'POST':
  form = ClientForm(request.POST or None)
  if form.is_valid():
   form.save()
   return HttpResponseRedirect('/index/clients/')
 return render_to_response('edit_client.html', {'form': form},  context_instance=RequestContext(request))

Answer 2

In your edit_client method, you pass form in the response, however, if the method wasn't a POST, you won't have initialized a form.