Django passing object ID in hiddeninput by populating -

i have form allows user edit object description. how can populate object id in form's hidden input value. done far added field called hidden_field in forms.py show hidden_field . how can link hidden_field object id

models.py

class school(models.model):       user = models.foreignkey(user)     name = models.charfield(max_length=55)     description = models.charfield(max_length=300,blank=true) 

forms.py

class schooldescriptionform(forms.modelform):         description = forms.charfield(widget=forms.textarea,max_length=300)         hidden_field = forms.charfield(widget=forms.hiddeninput())     class meta:         model = school          fields = () 

views.py

def schooleditor(request,school_id):       school = school.objects.get(pk=school_id,user=request.user)     form = schooldescriptionform(instance=school) # want populate object id       return render(request,'schooleditor.html',{'school':school,'form':form}) 

template

 <form method="post" enctype="multipart/form-data">      {% csrf_token %}     {{ form.as_p }}      <input type = "submit" value= "save" /> {{ form.field.as_hidden }}  </form> 

change hidden_field id , tell django include school's id.

class schooldescriptionform(forms.modelform):         description = forms.charfield(widget=forms.textarea,max_length=300)         id          = forms.charfield(widget=forms.hiddeninput())     class meta:         model = school          fields = ('id', 'name', 'description') 

edit:

if want conserve hidden_field name should add custom init method:

def __init__(self, *args, **kwargs):     super(schooldescriptionform, self).__init__(*args, **kwargs)     if self.instance:         self.fields['hidden_field'].initial = instance.id