GtkCellLayout::add_attribute
add_attribute(GtkCellRenderercell, string attribute, int column);
Adds an attribute mapping to the list in the cell layout. The column is the column of the model to get a value from, and the attribute is the parameter on cell to be set from the value.
So for example if column 2 of the model contains strings, you could have the "text" attribute of a GtkCellRendererText get its values from column 2.