Drop down box in django getting populated from a database table column

I searched the same thing on net and got many answers but some how
dint get working with any of them. Table: 1. Report :
reportType(foreign key from ReportCategory), name, description 2.
Report Category: name,description forms.py

class ReportForm_insert(forms.ModelForm):

class Meta:
model=Report
invent = ReportCategory.objects.all()
print invent
reportType_id = forms.ModelMultipleChoiceField(queryset = invent)

fields =('name','description',)

model.py

class ReportCategory(models.Model):

name = models.CharField(max_length=20)

description = models.CharField(max_length=20)

def __unicode__(self):
return self.name

class Report(models.Model):

reportType = models.CharField(max_length=200)

name = models.CharField(max_length=200)

description = models.CharField(max_length=300)

def __unicode__(self):
return self.name

I want the ReportType to be shown as a drop down box which would
contain values from the name column of the Report Category table. I am
surely going wrong big way but I am not understanding what to do... So
I am not understanding whether there is a problem with not able to
handle the foreign key or the drop down box.

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