Im trying to initialize a model form where both fields are foreign key.

Model:

class Subcohort(models.Model):
cohort_id=models.ForeignKey(Cohort,on_delete=models.PROTECT,default=0,db_constraint=False,related_name='subcohortid')
parent_id=models.ForeignKey(Cohort,on_delete=models.PROTECT,default=0,db_constraint=False,related_name='subparentid')

Form:

class SubcohortForm(forms.ModelForm):

class Meta:
    model = Subcohort

    fields = [
        "cohort_id","parent_id",
    ]

Views:

cohortidnew = Cohort.objects.latest('id').id
initialvalue2={
     'cohort_id':int(cohortidnew),
     'parent_id':id,
}

     form2 = SubcohortForm(initialvalue2)
            
     if form2.is_valid():
          return redirect('/dashboard')

It is saying my form is not valid. Can someone explain what is the reason behind this and how to fix this? Thanks.

CodePudding user response：

Because, you have not saved that form after validation.

let's save it:

 if form2.is_valid():
      form2.save()
      return redirect('/dashboard')

And now your problem will be solved..

CodePudding user response：

If you need the form intialize with these values, then please pass the values using initial parameter when initiaiting form object:

initialvalue2={
     'cohort_id':int(cohortidnew),
     'parent_id':id,
}

form2 = SubcohortForm(initial = initialvalue2)

You can send this form2 instance to the template directly without validating it. But you should check if the form is valid on post request. For example:

if request.method == 'GET':
     form2 = SubcohortForm(initial = initialvalue2)
     return render(request, template_name, context={'form2':form2})
else:
    form = SubcohortForm(request.POST)
    if form.is_valid():
       form.save()
       return redirect('dashboard')
    else:
       return render(request, template_name, context={'form2':form})