Show values in cells which do not come from database fields

[Former user]

Sometimes I want to show computed values in tables. How can I do this with the djanog-datatables-view?

[Maciej Wisniowski]

Just override render_column or prepare_results method and render it as you want.

[toabi]

render_column sadly converts to string already so doing super() and then calling the method is result is callable is not possible. I'd insert

if callable(value):
  value = value()

between the getattr and if value is None. But I just noticed that there's also not yet an easy way to then define how search is handled for those fields. So I think I'll just stick to database fields for now.

Would you be interested in the feature of having not only database fields as columns, but any callables/properties of models with support for search of those (via custom methods defined in the child of {{BaseDatatableView}}? I'm thinking about doing a PR.

[Maciej Wisniowski]

Sorry, but I don't understand what you mean. You can use render_column like:

class MyClass(BaseDatatableView):
    def render_column(self, row, column):
        if column == 'mycolumn':
            return '{} and {}'.format(row.field1, row.get_field2_display())  #or compute value in any other way you want
        else:
            return super(MyClass, self).render_column(row, column)

Regarding filtering, just override filter_queryset method in a way you need.