I have to generate a FormSet from a model but I need to insert an &quot;extra value&quot; in to every form.

Specifically, I have a JApplet that generates some Markers and Paths on a image, and POST it on the server.

In my model lines are composed from two Markers. But when I POST it, because I&#39;m using the id generated from the JApplet and not from the database, I will not know from which Markers a Path will be composed.

So I thought to insert a &quot;temporary id&quot; on the Marker on the form, and do the correct arrangements in the view before saving the Path.

I thought about defining a custom form for the markers, but it not seems to be very DRY, and I don&#39;t want to came back to this if I change the Marker model.

Here is the form:

      class PointForm(forms.ModelForm):
        temp_id = forms.IntegerField()
        class Meta:
                model = Point
                
        def clean(self):
                if any(self.errors):
                        # Don&#39;t bother validating the formset unless each form is valid on its own
                        return
      
                ingresso = self.cleaned_data[&#39;ingresso&#39;]
                ascensore = self.cleaned_data[&#39;ascensore&#39;]
                scala = self.cleaned_data[&#39;scala&#39;]
                
                if (ingresso and ascensore) or (ingresso and scala) or (ascensore and scala):
                        raise forms.ValidationError(&quot;A stair cannot be a elevator or an access!!!&quot;) 
                return self
        
        def save(commit=True):
        # do something with self.cleaned_data[&#39;temp_id&#39;]
                super(PointForm).save(commit=commit)
         

And the model:

      class Point(models.Model):

        RFID = models.CharField(max_length=200, blank=True)
        
        x = models.IntegerField()
        y = models.IntegerField()
        
        piano = models.ForeignKey(Floor)
        
        ingresso = models.BooleanField()

The error:


      ViewDoesNotExist at /admin/
      Could not import buildings.views.getFloors. View does not exist in module buildings.views.
      Request Method:	GET
      Request URL:	http://127.0.0.1:8000/admin/
      Django Version:	1.4.1
      Exception Type:	ViewDoesNotExist
      Exception Value:	
      Could not import buildings.views.getFloors. View does not exist in module buildings.views.
      Exception Location:	/usr/local/lib/python2.7/dist-packages/django/core/urlresolvers.py in get_callable, line 101


The error is generated when I try to load the admin page, this page has no references at all with the form. 


**SOLUTION FOR EXCEPTION**

Ok, I&#39;ll write here how to find out why Django was doing such a strange thing.

[Here][1] it&#39;s a correct way to find out what is the problem. 

The exception was thrown because I forgot to add `forms.py` to the `from django import forms`.




  [1]: https://stackoverflow.com/questions/11393257/viewdoesnotexist-error

All Japplet Solutions on Gang of Coders

Total of 1 Japplet Solutions

Django add extra field to a ModelForm generated from a Model