Can't set Nullable Fields to null

[TheNeikos]

• What would you like to be able to do? Can you provide some examples?

I have a boolean field on my model that can have 3 values, "not set" -> NULL, "true" and "false. Right now, I can only switch between true/false but not `NULL.

• How could we go about implementing that?

One could add a new option to Field::Boolean like 'nullable'. Although, this could be applied to all fields.

• Can you think of other approaches to the problem?

Not really in this case

[pablobm]

The problem with implementing this with a checkbox is that a checkbox only has two states. There's no way to express the three states you require.

Instead, you could create a custom field type that shows something else, perhaps three radio buttons. These would send values null, true or false, and a controller that knows how to use it, perhaps by overriding Administrate::ApplicationController#resource_params.

A similar conversation was had recently at #1478

If you are not sure of how to do this, ask on StackOverflow and I'll try to answer there (use the tag "administrate").