The boolean_subsets plugin allows for the automatic creation of subsets for
for boolean columns, which can DRY up model classes that define such
subsets manually. By default, subsets are created for all columns of type
:boolean, with the subset name being the same as column name, and the
conditions being column IS TRUE
(assuming the database
supports that syntax).
You can provide a block to the plugin, which will be called with column
name symbol, and should return an array of arguments to pass to
dataset_module.where
. Using this, you can change the method
name and arguments for each column. This block is executed in the context
of the model class.
Usage:
# Add boolean subset methods for all columns of type :boolean # in all model subclasses (called before loading subclasses) Sequel::Model.plugin :boolean_subsets # Add subsets for all boolean columns in the Album class Album.plugin(:boolean_subsets) # Remove is_ from the front of the column name when creating the subset # method name, and use (column = 'Y') as the filter conditions Sequel::Model.plugin :boolean_subsets do |column| [column.to_s.sub(/\Ais_/, ''), {column=>'Y'}] end
Create boolean subset methods for each boolean column.
# File lib/sequel/plugins/boolean_subsets.rb, line 32 def self.configure(model, &block) model.instance_exec do define_singleton_method(:boolean_subset_args, &block) if block create_boolean_subsets if @dataset end end