Rails - Strong parameters with empty arrays

Question

I\'m sending an array of association ids, say foo_ids to my controller. To permit an array of values, I use:

params.permit(foo_ids: [])

Answer 1

The temporary solution I've come down to is:

params[:foo_ids] ||= [] if params.has_key?(:foo_ids)
params.permit(foo_ids: [])

Here, foo_ids is set to an empty array only if is passed. If it is not passed in the request, it is ignored.

I'm still hoping to find a better solution to this, as this sort of thing will be quite common in the project I'm working on - please do suggest better ideas if you have any.