Getting the "Real" Foreign Key from a ModelForm

This is my first attempt at a work Django Application since the tutorial, so my odds of missing something obvious are pretty high.  Still, I've been as far as I can in the documentation, and I can't find anything that addresses this.  Using Python 2.7 and Django 1.6.5, in a ModelForm containing a foreign key, rather than returning the key value itself the form returns an object that represents the __unicode__(self) value of the model.  So it isn't an integer of a string, and I get a TypeError when I try to save it.

class Pad_info(models.Model):

    site_id = models.IntegerField(primary_key=True)

    name = models.CharField('Pad Location', max_length=40, unique=True)
...
(irrelevant fields snipped...)

   

    def __unicode__(self):

        return u'%s, %s' % (self.site_id, self.name)

    

    def ID(self):

        return self.site_id

    class Meta:

        db_table = 'pad_info'

        verbose_name = 'Pad Info'

class Inspections(models.Model):

    of_pad = models.ForeignKey(Pad_info)

    insp_date = models.DateField('Inspection Date')

    agency = models.CharField('Agency/ Organization', max_length=40)

    lead_inspector = models.CharField('Lead Inspector', max_length=40)

    accepted = models.BooleanField(default=False)

    comments = models.TextField('Comments/ Notes')

    def __unicode__(self):

        return self.agency

    def ID(self):

        return self.id

    class Meta:

        db_table = 'inspections'

        verbose_name = 'Pad Inspection'

Here's my form:

from django import forms

from django.forms import ModelForm

from django.forms.fields import DateField

from reclamationdb.models import Inspections

class create_insp_m(ModelForm):

    class Meta:

        model = Inspections

        fields = ['insp_date', 'of_pad', 'agency', 'lead_inspector', 'accepted', 

                'comments']

And here's my view, still under construction:

def inspectioncreate_m(request):

    if request.method == 'POST':

        form = create_insp_m(request.POST)

        if form.is_valid():

            # create new inspection record

            insp_date = form.cleaned_data['insp_date']

            of_pad = form.cleaned_data['of_pad']

            agency = form.cleaned_data['agency']

            lead_inspector = form.cleaned_data['lead_inspector']

            accepted = form.cleaned_data['accepted']

            comments = form.cleaned_data['comments']

            

            # find if there is a record that matches pad_id

            try:

                checkPad = Pad_info.objects.get(pk=of_pad)

                newrecord = Inspections(of_pad, insp_date, agency, lead_inspector, accepted, 

                            comments)

                newrecord.save(force_insert=True)

                

            except Pad_info.DoesNotExist:

                # display error message and blank the pad_id field

                pass

                

            return render(request, 'reclamationdb/inspectioncreate_mobile.html', {'form' : form,})

            #return HttpResponseRedirect('/index/')

        

        else:

            # invalid form

            pass

    else:

        # do something else

        form = create_insp_m()

        #return render(request, 'reclamationdb/inspectioncreate_mobile.html', {'form' : form,})

        

    return render(request, 'reclamationdb/inspectioncreate_mobile.html', {'form' : form,})

The form appears in a web page, and displays all the required information, including the data from the related one record in the foreign key.

But when I save, I get a Type Error, reading "int() argument must be a string or a number, not 'Pad_info'".

The traceback that's highlighted is the line "checkPad = Pad_info.objects.get(pk=of_pad)"

 And in the list of local variables, the relevant one seems to be:

"of_pad  <Pad_info: 41, N. EZ Jr>"

It's an object rather than a string, and I can't seem to filter out just the number 41, which is the actual content of pad_id, and the value I'm trying to save in the foreign key field. This is really driving me crazy!

Thanks!

Dave

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