CODEWITHSUNDEEP
pythondjango
Sharath Nayak
Sharath Nayak

Reputation: 217

How to save foreign key in django Model Form

I have two models and one form and one formsets so Formsets contains foreign of form and I want to save add id to formsets when saving both the forms and formsets.

model.py

class fmodel(models.Model):
   name=models.TextField(blank=True,null=True)

class smodel(models.Model):
   desc=models.TextField(blank=True,null=True)
   n=models.ForeignKey(fmodel,null=True,blank=True,related_name='somemodel')

forms.py

class fmodelForm(forms.ModelForm):
   name=forms.CharField(max_length=200,widget=forms.TextInput(attrs={'class': 'form-control'}))
    class Meta:
         model=fmodel
         fields=['name']

smodelFormset=modelformset_factory(
  smodel,
  fields=('desc',),
  extra=1,
  widgets={
      'desc':forms.TextInput(attrs={'class': 'u-form'})
  }
)

template

<div>
   <form role="form" action="//" enctype='multipart/form-data' method="post" id="form_sample_2" class="form-horizontal" novalidate="">{% csrf_token %}
     <div class="row">
          <div class="col-md-6" style="margin-bottom: 30px;">
                <label> name : </label>
                  {{form.name}}
          </div>
           <div class="col-md-6" style="margin-bottom: 30px;">
                 {{ form1.management_form }}
                 {% for f in form1 %}
                <label> desc : </label>
                  {{f.desc}}
                 {% endfor %}
          </div>
     </div>
     <input type="submit" value="Save" />
   </form>
</div>

views.py

form=fmodelForm(request.POST or None)
formset = smodelFormset(request.POST or None)
if form.is_valid():
   form.save()
if formset.is_valid():
   forms=formset.save(commit=False)
   for f in forms:
    #here I want to add id of previously added form
    f.save()

Upvotes: 2

Views: 2385

Answers (2)

Sharath Nayak
Sharath Nayak

Reputation: 217

Feeling so dumb now after solving my own question.

so here is the answer:

views.py

form=fmodelForm(request.POST or None)
formset = smodelFormset(request.POST or None)

#Just add 
if request.method == 'POST':
   if form.is_valid() and if formset.is_valid():
      instance=form.save()
      forms=formset.save(commit=False)
      for f in forms:
       f.foreignkey=instance.id
       f.save()

Upvotes: 1

willeM_ Van Onsem
willeM_ Van Onsem

Reputation: 477686

A form.save() returns the instance it has saved. We can then iterate over the forms, and for each form, set the .foreign_keyof the f.instance to that instance:

if form.is_valid() and formset.is_valid():
    instance = form.save()
    instances = formset.save(commit=False)
    for obj in instances:
        obj.foreign_key = instance
        obj.save()

You probably first want to validate both the form and the formset. Since if one of the two is invalid. It might be better not to save any data at all.

Upvotes: 2

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