<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def init_model(self, model, value):
 """Init model with field. :param DomainModel model: :param object value: """

        if value is None and self.default is not None:
            value = self.default() if callable(self.default) else self.default

        self.set_value(model, value)