[Answer]-While submitting data in first form blank object is getting created for second form django

You shouldn’t use one view function for two different actions.

You should do view for add/edit Crave objects like this:

from django.shortcuts import get_object_or_404
from django.core.exceptions import PermissionDenied
from django.contrib.auth.decorators import login_required

@login_required
def crave_edit(request, id=None):
    instance = get_object_or_404(crave_data, pk=id) if id else None
    if instance and instance.person != request.user:
        raise PermissionDenied()
    if request.method=="POST":
        form=CraveDataForm(request.POST, request.FILES, instance=instance)
        if form.is_valid():
            crave_made = form.save(commit=False)
            crave_made.person = request.user
            crave_made.save()                    
    else:                    
        form=CraveDataForm(instance=instance)  

    return render(request, "crave/crave_edit.html", {'form' : form})

Once again, you shouldn’t mix add/edit Crave with add comments. You can’t add comment to non-exist entity:

@login_required
def crave_view(request, id):
    crave = get_object_or_404(crave_data, pk=id)
    if request.method=="POST":
        form=CraveReplyForm(request.POST, request.FILES)
        if form.is_valid():
            reply = form.save(commit=False)
            reply.person=request.user
            reply.crave = crave
            reply.save()                    
    else:                    
        form=CraveReplyForm()  

    return render(request, "crave/crave_view.html", {'crave': crave, 'form' : form})

And please note that names for models should be capitalised, without underlines – “crave_data” is bad style