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# frozen_string_literal: true
module FromSetOperator
# Define a high level method to more easily work with the SQL set operations
# of UNION, INTERSECT, and EXCEPT as defined by Gitlab::SQL::Union,
# Gitlab::SQL::Intersect, and Gitlab::SQL::Except respectively.
def define_set_operator(operator)
method_name = 'from_' + operator.name.demodulize.downcase
method_name = method_name.to_sym
raise "Trying to redefine method '#{method(method_name)}'" if methods.include?(method_name)
define_method(method_name) do |members, remove_duplicates: true, remove_order: true, alias_as: table_name|
operator_sql =
if members.any?
operator.new(members, remove_duplicates: remove_duplicates, remove_order: remove_order).to_sql
else
where("1=0").to_sql
end
from(Arel.sql("(#{operator_sql}) #{alias_as}"))
end
end
end
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