I've overridden the create method for my custom module to create only records that have certain data in vals dict. I did this because the model is being filled by a service over xml-rpc calls, so I don't want to create a record if a user does not exist in odoo.

So I first check if the key is even in vals dict and if it is I check if it's in Odoo else I return False (tried None same error). The error is caused by the models.py original create method because of the decorator @api.returns('self', lambda value: value.id). So every time that I want to return false I get an AttributeError: 'bool' object has no attribute 'id' in my log.

Is there a way to return False/None without raising an AttributeError? I can't make this check in the script that's executed by the service, because every xml-rpc call/response takes ~ 1s and I need to do 3-5 and this would take to long. 

@api.model
def create(self, vals):
    if 'from_number' not in vals or 'to_number' not in vals:
        _logger.error(u'TABLA: from or to number not in vals! Exiting! vals: {}'.format(vals))
        return False

    if vals['from_number'] != '':
        caller_partner_id = self.get_partner_by_number(vals['from_number'])
        if caller_partner_id:
            vals['caller_partner_id'] = caller_partner_id
    else:
        _logger.error(u'TABLA: from number not in vals! Exiting! vals: {}'.format(vals))
        return False
    
    # some more checks, same style

    call = super(TablaAsteriskCalls, self).create(vals)
    
    # some more code if the record is created

    return call