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module Arel
class Project < Compound
attributes :relation, :projections
deriving :==
def initialize(relation, *projections, &block)
@relation = relation
@projections = (projections + arguments_from_block(relation, &block)) \
.collect { |p| p.bind(relation) }
end
def attributes
@attributes ||= projections.collect { |p| p.bind(self) }
end
def externalizable?
attributes.any?(&:aggregation?) or relation.externalizable?
end
end
end
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