human
Solve the following python programming problem given the following code:
def model_form(model, base_class = Form, fields = None, readonly_fields = None, exclude = None, field_args = None, converter = None) : 
    '
    Create a wtforms Form for a given MongoEngine Document schema::

        from flaskext.mongoengine.wtf import model_form
        from myproject.myapp.schemas import Article
        ArticleForm = model_form(Article)

    :param model:
        A MongoEngine Document schema class
    :param base_class:
        Base form class to extend from. Must be a ``wtforms.Form`` subclass.
    :param fields:
        An optional iterable with the property names that should be included
        in the form. Only these properties will have fields. It also
        determines the order of the fields.
    :param exclude:
        An optional iterable with the property names that should be excluded
        from the form. All other properties will have fields.
    :param field_args:
        An optional dictionary of field names mapping to keyword arguments used
        to construct each field object.
    :param converter:
        A converter to generate the fields based on the model properties. If
        not set, ``ModelConverter`` is used.
    ' 
    field_dict = model_fields (model, fields, readonly_fields, exclude, field_args, converter) 
    field_dict ['model_class'] = model 
    def populate_obj(self, obj) : 
        return data_to_document (obj, self.data) 
field_dict ['populate_obj'] = populate_obj 
    return type ((model.__name__ + 'Form'), (populate_obj,), field_dict) 

    
    

    Fix the buggy line: return type ((model.__name__ + 'Form'), (populate_obj,), field_dict)
assistant
#Here is Python code to fix the buggy line: return type ((model.

return type ((model.__name__ + 'Form'), (base_class,), field_dict)