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module Sequel
module Plugins
# 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)
#
module InvertedSubsets
# Default naming for inverted subsets
DEFAULT_NAME_BLOCK = lambda{|name| "not_#{name}"}
# Store the supplied block for calling later when subsets are defined, or
# create a default one if we need to.
def self.configure(model, &block)
model.instance_variable_set(:@inverted_subsets_name_block, block || DEFAULT_NAME_BLOCK)
end
module ClassMethods
Plugins.inherited_instance_variables(self, :@inverted_subsets_name_block => nil)
# Define a not_ prefixed subset which inverts the subset condition.
def subset(name, *args, &block)
super
def_dataset_method(@inverted_subsets_name_block.call(name)){exclude(*args, &block)}
end
end
end
end
end
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6 entries across 6 versions & 1 rubygems