human
Solve the following python programming problem given the following code:
def datamodel_from_data(env, model_data, parent = None) : 
    def get_value(key) : 
        path = key.split ('.') 
        node = model_data 
        for item in path : 
            node = node.get (item) 
if (node is not None) : 
            return node 
if (parent is not None) : 
            node = parent 
            for item in path : 
                node = getattr (node, item) 
return node 
fields = fields_from_data (env, model_data ['fields'], ((model_data and parent.fields) or None)) 
    return DataModel (env, filename = model_data ['filename'], id = model_data ['id'], parent = parent, name_i18n = model_data ['name_i18n'], primary_field = model_data ['primary_field'], label_i18n = get_value ('label_i18n'), hidden = get_value ('hidden'), protected = get_value ('protected'), child_config = ChildConfig (enabled = get_value ('child_config.enabled'), slug_format = get_value ('child_config.slug_format'), model = get_value ('child_config.model'), order_by = get_value ('child_config.order_by'), replaced_with = get_value ('child_config.replaced_with')), attachment_config = AttachmentConfig (enabled = get_value ('attachment_config.enabled'), model = get_value ('attachment_config.model'), order_by = get_value ('attachment_config.order_by')), pagination_config = PaginationConfig (enabled = get_value ('pagination_config.enabled'), per_page = get_value ('pagination_config.per_page'), url_suffix = get_value ('pagination_config.url_suffix')), fields = fields) 

    
    

    Fix the buggy line: fields = fields_from_data (env, model_data ['fields'], ((model_data and parent.fields) or None))
assistant
#Here is Python program to fix the buggy line: fields = fields_from_data (env, model_data ['fields'], ((model_data and parent.

fields = fields_from_data (env, model_data ['fields'], ((parent and parent.fields) or None))