Question

I’m not really too sure how to title this question, but I’m trying to develop a simple webapp with Django. What I’m trying to do is that the user will manually tag each image, and each tag will have a foreign key to a specific image (but each image can have multiple tags). The index page is supposed to display the actual image, but I haven’t figured that out yet…

Pretty much the problem is, I’m not sure how to implement it so for each page, the index page will show a picture and a box for the image tag. After the user submits, it will go to the next untagged image / image with the least number of tags. Right now, the user can submit a tag (and the data is written correctly), but it still stays on the same image. I’m a Python / Django noob, so forgive me 😛

Here is the relevant source code:

forms.py:

class InputForm(forms.ModelForm):
image = forms.ModelChoiceField(queryset=Image.objects.all(),
    widget=forms.HiddenInput())

class Meta:
    model = Tag 

models.py:

class Image(models.Model):
image_location = models.CharField(max_length=200)
num_tags = models.IntegerField(default=0)   
image_score = models.FloatField()   
def __unicode__(self):
    return u'%d' % self.id 

class Tag(models.Model):
image = models.ForeignKey(Image)
tag_text = models.CharField(max_length=200, blank=True)

def __unicode__(self):
    return self.tag_text

views.py:

def index(request):
    if request.method == 'POST':
            return HttpResponse(request.POST['image'])

    image = Image.objects.all()[0]
    form = InputForm(initial={'image': image})
    return render_to_response('imageSite/index.html',
    {
            'form':form,
    },
    context_instance=RequestContext(request))

def submit(request):
    form = InputForm(request.POST)
    if(form.is_valid()):
            image = form.cleaned_data['image'];
            image.num_tags = image.num_tags + 1
            image.save()
            model = form.save()
            model.save()
            return redirect(index)

index.html:

<ul>
<form action="/imageSite/submit/" method="post">
{%csrf_token %}
<table>
    {{ form.as_table }}
</table>    
<input type="submit" value="Submit" /> 
</form> 
</ul>

Answer 1

The code return redirect(index) won’t work. You’ll need to return a redirect response with the proper URL to which it should redirect. For example:

redirect_url = '/images/45/'
return HttpResponseRedirect(redirect_url)

See this example in the Django documentation for a full example. Note that the value for redirect_url needs to be computed in your view: you’ll need to compute the Image object with the least number of tags and use Django’s reverse to cleanly compute the URL of that Image object. If the form is invalid then you should not perform a redirect.