How can i return act_window with context in function on_change ?

Question

def onchange_stage_id( self , cr, uid, ids, stage_id, context= None ):
# open a new act window to display
if stage.name == 'Proposal' :
print stage.name
return {
'type' : 'ir.actions.act_window' ,
'res_model' : 'sale.order' ,
'view_type' : 'form' ,
'view_mode' : 'form' ,
'target' : 'new' ,
}
when i do this onchange i got an error
onchange_stage_values = self.onchange_stage_id(cr, uid, ids, vals.get('stage_id'), context=context)['value']
KeyError: 'value'

Deepa Venkatesh · Answer

You are getting such error because of this code

self.onchange_stage_id(cr, uid, ids, vals.get('stage_id'), context=context)['value']
onchange_stage_id is not returning any dict having "value" as its key/item hence you got that error,

so you can handle it in 2 ways:
1.  declare/initialize "value" in the return dict of the onchange function to ensure that it always returns "value" least dummy value.
Something like this
def onchange_stage_id...
res['value'] = {} # initialize res at the start of t

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