def __init__(self, column_name, datamodel, is_related_view=False):
self.column_name = column_name<EOL>self.datamodel = datamodel<EOL>self.model = datamodel.obj<EOL>self.is_related_view = is_related_view<EOL>if self.arg_name:<EOL><INDENT>map_args_filter[self.arg_name] = self.__class__<EOL><DEDENT>
Constructor.

:param column_name:
    Model field name
:param datamodel:
    The datamodel access class
:param is_related_view:
    Optional internal parameter to filter related views