views.py 文件源码

def get_field_value(self, obj, field_name):
        """ Override if a custom value or behaviour is required for specific fields. """
        if '__' not in field_name:
            if hasattr(obj, 'all') and hasattr(obj, 'iterator'):
                return ','.join([getattr(ro, field_name) for ro in obj.all()])

            try:
                field = obj._meta.get_field(field_name)
            except FieldDoesNotExist as e:
                if not hasattr(obj, field_name):
                    raise e
                # field_name is a property.
                return getattr(obj, field_name)

            value = field.value_from_object(obj)
            if field.many_to_many:
                return ','.join([six.text_type(ro) for ro in value])
            elif field.choices:
                if value is None or six.text_type(value).strip() == '':
                    return ''
                return dict(field.choices)[value]
            return field.value_from_object(obj)
        else:
            related_field_names = field_name.split('__')
            related_obj = getattr(obj, related_field_names[0])
            related_field_name = '__'.join(related_field_names[1:])
            return self.get_field_value(related_obj, related_field_name)