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module ActiveRelation
class Projection < Compound
attr_reader :projections
alias_method :attributes, :projections
def initialize(relation, *projections)
@relation, @projections = relation, projections
end
def ==(other)
self.class == other.class and
relation == other.relation and
projections == other.projections
end
def qualify
Projection.new(relation.qualify, *projections.collect(&:qualify))
end
end
end
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