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# frozen-string-literal: true
module Sequel
class Dataset
# This Module subclass is used by Database#extend_datasets
# and Dataset#with_extend to add dataset methods to classes.
# It adds some helper methods inside the module that can define
# named methods on the dataset instances which do specific actions.
# For example:
#
# DB.extend_datasets do
# order :by_id, :id
# select :with_id_and_name, :id, :name
# where :active, :active
# end
#
# DB[:table].active.with_id_and_name.by_id
# # SELECT id, name FROM table WHERE active ORDER BY id
class DatasetModule < ::Module
meths = (<<-METHS).split.map(&:to_sym)
where exclude exclude_having having
distinct grep group group_and_count group_append
limit offset order order_append order_prepend reverse
select select_all select_append select_group server
METHS
# Define a method in the module
def self.def_dataset_caching_method(mod, meth)
mod.send(:define_method, meth) do |name, *args, &block|
if block
define_method(name){public_send(meth, *args, &block)}
else
key = :"_#{meth}_#{name}_ds"
define_method(name) do
cached_dataset(key){public_send(meth, *args)}
end
end
end
end
meths.each do |meth|
def_dataset_caching_method(self, meth)
end
end
end
end
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