Override values in Django ModelForm instance during get_form() -

i have model "savedsearch" generic updateview. each site user can have 1 saved search. when running search on site, want give them ability click "save search" button take them edit form current savedsearch model , replace values ones search (saved in request.session.params).

so, i'm trying catch bound form on way template , replace values without saving, user has chance edit options or change mind , cancel.

i've tried updating instance fields in get_form():

def get_form(self, form_class):     form = super(savedsearchupdateview, self).get_form(form_class)     # if request coming search form "save" click,     # replace form context data options search form.     if self.request.get.get('ss_override') , self.request.session.get('params', none):         params = self.request.session["params"]         if params.get('location', none): form.instance.location_keywords = params.get('location')         # ... etc.      return form 

i've tried passing request form's __init__ via get_form_kwargs() , doing pretty same above within form's init. both tactics result in no change whatsoever form data.

i tried passing request get_form_kwargs() , in __init__:

def __init__(self, *args, **kwargs):     request = kwargs.pop('request')      super(dreamhomepreferenceform, self).__init__(*args, **kwargs)      # if request coming property search form "save" click,     # replace form context data options search form.     if request.get.get('ehf_override') , request.session.get('params', none):         params = request.session["params"]         new_data = {}         if params.get('location', none): new_data['location_keywords'] = params.get('location')          self.data = self.data.update(new_data) 

this yields no change in form display. tried override data kwarg completely, in get_form_kwargs(), form tries validate right away , fields not in new data show errors.

if can give push in right direction, i'd grateful.

this pretty hard understand - have been helpful have more details user flow.

but think want provide initial data form, rather changing field instances. can done overriding get_initial method of view, return dictionary. passed in form returned get_form automatically, there no need override method.

def get_initial(self):     if self.request.get.get('ehf_override') , self.request.session.get('params'):         initial_data = {}         ...     else:         initial_data = super(savedsearchupdateview, self).get_initial()     return initial_data