Duplicate entry in database on refreshing the submitted form

[Satinderpal Singh]

I am using mysql database with my project, and made a user input form
with submit button. After submitting the form, it produces an html
output, If i again reload the output page it fills a duplicate entry
in the database. And on every refresh, it continues to add entries in
the database.
How will i prevent these duplicate entries on refreshing.

Here is the views of my code related to that form:
def header(request):
if request.method=='POST':
form = headForm(request.POST)
if form.is_valid():
cd = form.cleaned_data
form.save()
zee = head.objects.aggregate(Max('id'))
mee =zee['id__max']
Head = head.objects.filter(id = mee)
return render_to_response('report/header.html',
{'Head':Head,},context_instance=RequestContext(request))

else:
form = headForm()
return render_to_response('report/report.html', {"form":form},
context_instance=RequestContext(request))

And the models are described as:
class head(models.Model):
refrence_no = models.CharField(max_length=255) #college
reference letter no.
dispatch_report_date = models.CharField(max_length=255) #report
dispatch date, to the client
date_of_testing = models.CharField(max_length=255) #date on
which test is performed
subject = models.CharField(max_length=255)
reference = models.CharField(max_length=255) #client reference letter no.
column_1 = models.CharField(max_length=255,blank=True)
column_2 = models.CharField(max_length=255,blank=True)
column_3 = models.CharField(max_length=255,blank=True)

def __str__(self):
return self.subject

class headForm(ModelForm):
class Meta :
model = head

Thanks in advance.

--
Satinderpal Singh
http://satindergoraya.blogspot.in/
http://satindergoraya91.blogspot.in/

[Timster]

After saving the form, instead of doing a render_to_response, you should redirect the user to another page.

[Satinderpal Singh]

On Sat, Sep 29, 2012 at 5:22 PM, Timster <timsha...@gmail.com> wrote:
> After saving the form, instead of doing a render_to_response, you should
> redirect the user to another page.

Thanks Timster, it works!

[Amyth Arora]

As Tim said use "redirect" instead of "render". Alternatively on form submit you can also have some kind of validation for ex: Query for one reference_no can take place only once in 24 hours and if it is being submitted twice return an error message. This way it will be more user friendly. Also, you can add a "unique" field in your models to achieve this.

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