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# frozen-string-literal: true
module Sequel
module Plugins
# The subset_conditions plugin creates an additional *_conditions method
# for every subset created, which returns the filter conditions the subset
# uses. This can be useful if you want to use the conditions for a separate
# filter or combine them with OR.
#
# Usage:
#
# # Add subset_conditions in the Album class
# Album.plugin :subset_conditions
#
# # This will now create a published_conditions method
# Album.dataset_module do
# subset :published, published: true
# end
#
# Album.where(Album.published_conditions).sql
# # SELECT * FROM albums WHERE (published IS TRUE)
#
# Album.exclude(Album.published_conditions).sql
# # SELECT * FROM albums WHERE (published IS NOT TRUE)
#
# Album.where(Album.published_conditions | {ready: true}).sql
# # SELECT * FROM albums WHERE ((published IS TRUE) OR (ready IS TRUE))
module SubsetConditions
def self.apply(model, &block)
model.instance_exec do
@dataset_module_class = Class.new(@dataset_module_class) do
include DatasetModuleMethods
end
end
end
module DatasetModuleMethods
# Also create a method that returns the conditions the filter uses.
def where(name, *args, &block)
super
cond = args
cond = cond.first if cond.size == 1
define_method(:"#{name}_conditions"){filter_expr(cond, &block)}
end
end
end
end
end
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