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Instance partial update

Author:
dballanc
Posted:
September 9, 2007
Language:
Python
Version:
.96
Tags:
forms model partial updating
Score:
7 (after 7 ratings)

If you're like me, you've got a models with a lot of fields/foreignkeys and often only want to edit a portion of the model in a form. Add this method to your custom form class and use it in place of the save() method.

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"""
Add this method to a custom form to use as an alternative
to the save method.  When passed an object instance, the it
will set values on the model corresponding to matching
field names on the form.  

Example:

myobject = MyObject.objects.get(pk=1) 
form = MyForm(request.POST) 
    if form.is_valid(): 
        form.update_instance(myobject)
"""
def update_instance(self,instance,commit=True):
    for f in instance._meta.fields:
        if f.attname in self.fields:
            setattr(instance,f.attname,self.cleaned_data[f.attname])
    if commit:
        try: 
            instance.save()
        except: 
            return False
    return instance

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