The inverted_subsets plugin adds another method for each defined subset, which inverts the condition supplied. By default, inverted subset method names are prefixed with not_.

You can change the prefix, or indeed entirely customise the inverted names, by passing a block to the plugin configuration:

  # Use an exclude_ prefix for inverted subsets instead of not_
  Album.plugin(:inverted_subsets){|name| "exclude_#{name}"}

Usage:

  # Add inverted subsets in the Album class
  Album.plugin :inverted_subsets

  # This will now create two methods, published and not_published
  Album.dataset_module do
    where :published, published: true
  end

  Album.published.sql
  # SELECT * FROM albums WHERE (published IS TRUE)

  Album.not_published.sql
  # SELECT * FROM albums WHERE (published IS NOT TRUE)