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module Arel
class Compound < Relation
attr_reader :relation
hash_on :relation
delegate :joins, :wheres, :join?, :inserts, :taken,
:skipped, :name, :aggregation?, :column_for,
:engine, :table, :table_sql,
:to => :relation
def attributes
@attributes ||= relation.attributes.collect { |a| a.bind(self) }
end
def wheres
@wheres ||= relation.wheres.collect { |w| w.bind(self) }
end
def groupings
@groupings ||= relation.groupings.collect { |g| g.bind(self) }
end
def orders
@orders ||= relation.orders.collect { |o| o.bind(self) }
end
end
end
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