While returning from onchange, Error: [_.sprintf] expecting number but found string

Question

I have defined a onchange and returned the calculated age from give date of birth(dob)

def onchange_getage_id(self, cr, uid, ids, dob, context=None):

    if dob:
        current_age = datetime.now().year - parser.parse(dob).year
        print current_age
        return {'value':{'age':current_age}}
    else:
        return {'value':{'age':' '}}

I have declared that age field has integer like this.

'age' : fields.integer('Age'),

While entering dob it returns the age, but when we remove and give nothing in field it return with

Error: [_.sprintf] expecting number but found string

Answer 1

I found the answer!

If you have declared the field has integer you must have to return the dictionary value has integer.

I have returned it has space (return {'value':{'age':' '}}) that means string. This is the reason for error.

So did the following change in return value in else part.

else
    return {'value':{'age':0}}