rows.py 文件源码

def _get_and_render_with(self, name, render_func, default):
        bound_column = self.table.columns[name]

        value = None
        accessor = A(bound_column.accessor)

        # We need to take special care here to allow get_FOO_display()
        # methods on a model to be used if available. See issue #30.
        penultimate, remainder = accessor.penultimate(self.record)

        # If the penultimate is a model and the remainder is a field
        # using choices, use get_FOO_display().
        if isinstance(penultimate, models.Model):
            try:
                field = accessor.get_field(self.record)
                display_fn = getattr(penultimate, 'get_%s_display' % remainder,
                                     None)
                if getattr(field, 'choices', ()) and display_fn:
                    value = display_fn()
                    remainder = None
            except FieldDoesNotExist:
                pass

        # Fall back to just using the original accessor
        if remainder:
            try:
                value = accessor.resolve(self.record)
            except Exception:
                # we need to account for non-field based columns (issue #257)
                is_linkcolumn = isinstance(bound_column.column, BaseLinkColumn)
                if is_linkcolumn and bound_column.column.text is not None:
                    return render_func(bound_column)

        if value in bound_column.column.empty_values:
            return default

        return render_func(bound_column, value)