module Sequel::Plugins::InvertedSubsets

  1. lib/sequel/plugins/inverted_subsets.rb

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.subset :published, :published => true

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

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

Methods

Public Class

  1. apply

Included modules

  1. DatasetModuleMethods

Public Class methods

apply (mod, &block)
[show source]
# File lib/sequel/plugins/inverted_subsets.rb, line 29
def self.apply(mod, &block)
  mod.instance_exec do
    @dataset_module_class = Class.new(@dataset_module_class) do
      include DatasetModuleMethods
      if block
        define_method(:inverted_subset_name, &block)
        private :inverted_subset_name
      end
    end
  end
end